JP2004127459A - Recording control device and recording control method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce data of a high bit rate in a real time even if defect exists in a disk. <P>SOLUTION: In an allocation manager, a continuous empty region detecting section 46 detects a continuous empty region of an optical disk 3 being the physically continuous region, and supplies it to a recording control section 48. The recording control section 48 performs control for writing data to the continuous empty region, thereby, data is recorded continuously in the continuous empty region of the optical disk 3. When the continuous data is reproduced, seek therefore is not caused in a drive 2 driving the optical disk 3. For example, this device can be applied to a drive driving a disk. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording control device, a recording control method, and a program, and more particularly, to a recording control device and a recording method that enable high-bit-rate data to be reproduced in real time even if, for example, an optical disc has a defect. The present invention relates to a control method and a program.
[0002]
[Prior art]
For example, in a conventional drive that drives a disk-shaped recording medium such as an optical disk, a magneto-optical disk, and a magnetic disk, data is read and written in units of, for example, ECC (Error Checking and Correction) ECC blocks.
[0003]
In a conventional drive, a physical physical sector obtained by dividing a recording area of an optical disk or the like into a predetermined size is assigned to a logical logical sector. Then, a logical sector in which data is to be recorded is designated by an external device, and the drive records data in a physical sector assigned to the logical sector.
[0004]
In the drive, for example, a physical sector of a certain physical sector number is used as a reference for a physical sector of a user area (user area) which is a recording area opened to the user on the optical disk. Sectors are allocated sequentially.
[0005]
By the way, in a conventional drive, when a defective area, which is an area that cannot be read / written normally, exists in a recording medium, the defective area is dealt with by slip processing or reassignment processing (for example, see Patent Document 1). ).
[0006]
That is, for example, for the sake of simplicity, assuming that the size of an ECC block is equal to the size of a sector, a logical sector is not assigned to a defective physical sector (bad sector) in the slip processing. It is skipped (slid) and assigned to the next normal physical sector.
[0007]
Therefore, for example, as shown in FIG. 1, the physical sectors of physical sector numbers (hereinafter, appropriately referred to as PSNs (Physical Sector Numbers)) #N, # N + 1,. (Hereinafter, appropriately referred to as LSN (Logical Sector Number)), when assigned to logical sectors #n, # n + 1,..., Physical sectors of PSN # N + 3 (hereinafter, appropriately referred to as physical sectors N + 3) Is described as a bad sector, the physical sector N + 3, which is the bad sector, is skipped and a logical sector is allocated. As a result, in the example of FIG. 1, the logical sectors n, n + 1, n + 2 are respectively assigned to the physical sectors N, N + 1, N + 2, the physical sector N + 3 is skipped, and the physical sectors N + 4, N + 5,. , Logical sectors n + 3, n + 4,.
[0008]
Then, in the drive, as shown in FIG. 2, PSN # N + 3 of physical sector N + 3, which is a bad sector to which no logical sector is assigned, is registered in a defect list, which is a list of defective areas.
[0009]
When the slip processing is performed, when an access to a certain logical sector is requested, the drive determines the physical sector assigned to the logical sector, and the drive determines the logical sector before the logical sector (the logical sector before the logical sector). In a logical sector having an LSN smaller than the LSN of the sector), it is necessary to check how many bad sectors exist with reference to the defect list.
[0010]
Here, in the slip processing, the PSN of the physical sector assigned to the logical sector shifts, and the defective sector cannot be recognized from outside the drive. Therefore, the slip processing is generally performed at the time of formatting (certify) the optical disk.
[0011]
On the other hand, in the reassignment process, when the physical sector assigned to the logical sector is a bad sector, a normal physical sector is secured as a substitute for the bad sector.
[0012]
That is, in the reassignment process, for example, as shown in FIG. 3, when the physical sectors N, N + 1,... Are assigned to the logical sectors n, n + 1,. Sometimes, a certain physical sector in a spare area (spare area), which is a spare area reserved separately from the user area on the optical disk, is reserved as a substitute sector for a defective sector. In FIG. 3, a physical sector A in a spare area is reserved as an alternative area to the physical sector N + 3 which is a bad sector in the user area. In this case, the logical sectors n, n + 1,... Are assigned to the physical sectors N, N + 1,..., But for the bad sector N + 3, the normal physical sector A is reserved as an alternative sector. The logical sector n + 3 allocated to the bad sector N + 3 is substantially allocated to the physical sector A.
[0013]
Then, in the drive, as shown in FIG. 4, the PSN # N + 3 of the bad sector and the PSN # A of the physical sector A secured as a substitute sector for the bad sector N + 3 are associated with each other and registered in the defect list. .
[0014]
When the reassignment process is performed, when a request for access to a certain logical sector is made, the drive may perform a linear conversion using the logical sector to obtain a physical sector assigned to the logical sector. I'm done. However, if the obtained physical sector is a bad sector, the physical sector associated with the bad sector in the defect list is finally used as the physical sector assigned to the logical sector. .
[0015]
Here, even if the reassignment process is performed, the linear relationship between the LSN of the logical sector and the PSN of the physical sector is maintained, but the physical sector that is a bad sector is substantially replaced by another normal physical sector. Is replaced by For this reason, the reassignment process can be performed after formatting, and is generally performed when a new defective sector occurs after formatting the optical disc.
[0016]
In the slip processing, when the physical sector to be assigned to the logical sector is a bad sector, the physical sector assigned to the logical sector is slipped to the physical sector immediately after the bad sector, so that the logical sector is However, the physical sectors allocated to the logical sector are discontinuous on the optical disk. On the other hand, in the reassignment process, when a physical sector to be allocated to a logical sector is a bad sector, the physical sector allocated to the logical sector is substantially a physical sector in a spare area different from the user area. As a result, even if the logical sectors are continuous, the physical sectors allocated to the logical sectors are discontinuous on the optical disk.
[0017]
Therefore, in the drive, a seek is required in a portion where the physical sector is discontinuous. In the slip process, the physical sector assigned to the logical sector is slid to the physical sector immediately after the bad sector, whereas in the reassign process, the physical sector (substantially) assigned to the logical sector is In general, the seek time is longer when the reassignment process is performed than when the slip process is performed because the physical sector is replaced with a physical sector in a spare area different from the area.
[0018]
[Patent Document 1]
JP-A-06-068598.
[0019]
[Problems to be solved by the invention]
As described above, when the slip processing or the reassignment processing is performed, the drive accesses a discontinuous physical sector to cause a seek.
[0020]
Therefore, when high bit rate data, particularly, for example, moving image data is recorded on an optical disc and reproduced, a seek may occur, and the data may not be reproduced in real time.
[0021]
The present invention has been made in view of such a situation, and is intended to enable high-bit-rate data to be reproduced in real time even if an optical disk or the like has a defect.
[0022]
[Means for Solving the Problems]
The recording control device of the present invention includes a continuous free area detecting unit that detects a continuous free area that is a physically continuous free area of a recording medium, and a recording control unit that continuously records data in a continuous free area. It is characterized by having.
[0023]
The recording control method according to the present invention includes: a continuous free area detection step of detecting a continuous free area that is a physically continuous free area of a recording medium; and a recording control step of continuously recording data in the continuous free area. It is characterized by having.
[0024]
The program according to the present invention includes a continuous free area detection step of detecting a continuous free area that is a physically continuous free area of a recording medium, and a recording control step of continuously recording data in the continuous free area. It is characterized.
[0025]
In the recording control device, the recording control method, and the program according to the present invention, a continuous free area that is a physically continuous free area of a recording medium is detected, and data is continuously recorded in the continuous free area.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 5 shows a configuration example of an embodiment of a recording / reproducing system to which the present invention is applied.
[0027]
The recording / reproducing system shown in FIG. 5 is configured based on a computer 1. The computer 1 reads and writes data from and on an optical disc 3, for example, a CD-R (Compact Disc Recordable) and a CD-RW (CD ReWritable). ) And a drive 2 as a DVD-RAM (Digital Versatile Disc Random Access Memory) drive. That is, the optical disk 3 can be easily attached to and detached from the drive 2, and the drive 2 records (writes) data on the optical disk 3 under the control of the computer 1. Read data.
[0028]
In the embodiment of FIG. 5, AV (Audio Visual) data such as image data and audio data is output, and a VTR (Video Tape Recorder) or a TV tuner to which AV data can be input as necessary. Is connected to the computer 1 as an external device. The computer 1 receives the AV data output from the signal input / output device 4, supplies the AV data to the drive 2, and records the data on the optical disc 3. Further, the computer 1 causes the drive 2 to read the AV data recorded on the optical disk 3 and output the data from a built-in display or speaker, for example. Alternatively, the computer 1 causes the signal input / output device 4 to record the AV data read from the optical disk 3, for example.
[0029]
FIG. 6 shows a hardware configuration example of the computer 1 of FIG.
[0030]
The CPU (Central Processing Unit) 11 executes, for example, a program stored in a ROM (Read Only Memory) 12 when a command is input by operating the input unit 16 by a user or the like. Alternatively, the CPU 11 may execute a program stored in an HD (Hard Disk) 15, a program transferred from a satellite or a network, received by the communication unit 18 and installed in the HD 15, or the optical disc 3 mounted on the drive 2. For example, a program read from a removable recording medium such as a hard disk and installed in the HD 15 is loaded into a RAM (Random Access Memory) 14 and executed. Thus, the CPU 11 performs various processes according to a flowchart described later.
[0031]
The ROM 12 stores, for example, an IPL (Initial Program Loading), a BIOS (Basic Input Output System) program, and other firmware. Note that, instead of the ROM 12, a rewritable EEPROM (Electrically Erasable Programmable ROM) can be adopted, and in this case, it is possible to deal with an upgrade of the firmware.
[0032]
The memory controller 13 includes, for example, a DMA (Direct Memory Access) controller, and controls reading and writing of data from and to the RAM 14. The RAM 14 temporarily stores a program executed by the CPU 11 and data necessary for the CPU 11 to perform a process. The HD 15 stores programs (including an OS (Operating System) as well as application programs) installed in the computer 1 and data necessary for the CPU 11 to perform processing.
[0033]
The input unit 16 includes, for example, a keyboard, a mouse, a microphone (microphone), and the like, and is operated by a user. Then, the input unit 16 supplies a signal corresponding to a user operation or the like to the CPU 11. The output unit 17 includes, for example, a display and a speaker, and displays or outputs an image or a sound supplied thereto, respectively. The communication I / F (Interface) 18 includes, for example, an IEEE (Institute of Electrical and Electronics Engineers) 1394 port, a USB (Universal Serial Network Bus), and a LAN (Local Area Network for Network Access Network). It performs communication control according to each standard.
[0034]
The I / F controller 19 functions as an interface for exchanging data with the drive 2 using a predetermined method such as ATA (AT Attachment).
[0035]
The data conversion unit 20 is configured by, for example, an MPEG (Moving Picture Experts Group) encoder / decoder, and MPEG-encodes AV data supplied from the signal input / output device 4, and converts the resulting MPEG stream into a computer 1 Output on the bus. Also, the data conversion unit 20 performs MPEG decoding on the MPEG stream output on the bus of the computer 1 and outputs the resulting AV data on the bus of the computer 1 or supplies the AV data to the signal input / output device 4. I do.
[0036]
The above-described CPU 11 to data conversion unit 20 are mutually connected via a bus inside the computer 1.
[0037]
In the computer 1 configured as described above, the CPU 11 executes programs installed in the computer 1 to perform various processes described below.
[0038]
Here, the program executed by the CPU 11 can be recorded in the HD 15 or the ROM 12 as a recording medium built in the computer 1 in advance.
[0039]
Alternatively, the program may be temporarily or permanently stored on a removable recording medium such as a flexible disk, a CD-ROM (Compact Disc Only Memory), an MO (Magneto Optical) disk, a DVD (Digital Versatile Disc), a magnetic disk, or a semiconductor memory. It can be stored (recorded) in an appropriate manner. Such a removable recording medium can be provided as so-called package software.
[0040]
The program is installed in the computer 1 from the above-described removable recording medium, and is wirelessly transferred from the download site to the computer 1 via an artificial satellite for digital satellite broadcasting, or a LAN (Local Area Network). The program can be transferred to the computer 1 via a wire via a network such as the Internet, and the computer 1 can receive the transferred program by the communication I / F 18 and install the program on the built-in HD 15.
[0041]
Here, in the present specification, processing steps for describing a program for causing the computer 1 to perform various kinds of processing do not necessarily have to be processed in chronological order in the order described in the flowchart, and may be performed in parallel or individually. (For example, parallel processing or processing by an object).
[0042]
Further, the program may be processed by one CPU or may be processed in a distributed manner by a plurality of CPUs. Further, the program may be transferred to a remote CPU and executed.
[0043]
Next, FIG. 7 illustrates an example of a hardware configuration of the drive 2 mounted on the computer 1.
[0044]
The spindle motor 31 drives the optical disc 3 to rotate under the control of the servo control unit 32. The servo control section 32 controls the spindle motor 31 and the pickup section 33 according to signals supplied from an RF (Radio Frequency) amplifier 34 and a control section 39. The pickup unit 33 irradiates the optical disc 3 with a laser beam while performing positioning, tracking and focus control according to the control of the servo control unit 32.
[0045]
That is, at the time of data recording, a signal corresponding to data to be recorded is supplied from the signal processing unit 35 to the pickup unit 33, and the pickup unit 33 transmits a laser beam corresponding to the signal to the optical disc 3. Irradiation records data on the optical disc 3. In reproducing data, the pickup unit 33 irradiates the optical disc 3 with laser light, receives reflected light of the irradiated laser light from the optical disc 3, and generates an electric signal corresponding to the reflected light. The RF signal is supplied to the RF amplifier 34.
[0046]
The RF amplifier 34 amplifies the RF signal supplied from the pickup unit 33 and supplies the RF signal to the servo control unit 32 and the signal processing unit 35. The servo control unit 32 performs each servo control of a focus servo, a tracking servo, and a spindle servo based on the RF signal supplied from the pickup unit 33.
[0047]
The signal processing unit 35 adds an ECC code to data in units of ECC blocks supplied from the memory controller 36 according to the control of the control unit 39 and modulates the data. To supply. Further, the signal processing unit 35 demodulates the RF signal supplied from the RF amplifier 34, performs ECC processing on the demodulated data obtained as a result, and supplies the demodulated data to the memory controller 36.
[0048]
Under the control of the control unit 39, the memory controller 36 stores data supplied from the signal processing unit 35 or the I / F controller 38 in the memory 37, reads the data stored in the memory 37, and reads the data. , I / F controller 38 or signal processing unit 35. The memory 37 temporarily stores data supplied from the memory controller 36.
[0049]
The I / F controller 38 functions as an interface for exchanging data with the I / F controller 19 in FIG. 6 by a predetermined method such as ATA (AT Attachment). In addition to the data, the I / F controller 19 in FIG. 6 also issues a command for instructing the control unit 39 to perform a predetermined process, the LSN of the optical disk 3 to be read / written, and the like. It is supplied to the controller 38. When receiving the command or the LSN, the I / F controller 38 supplies the command or the LSN to the control unit 39.
[0050]
The control unit 39 performs various processes for reading and writing data on the optical disc 3. That is, the control unit 39 controls the signal processing unit 35 and the memory controller 36 according to the command supplied from the I / F controller 38, and converts the LSN also supplied from the I / F controller 38 into PSN. Thus, data is recorded in the physical sector of the optical disc 3 specified by the PSN, or data is read from the physical sector. Further, the control unit 39 controls the servo control unit 32 as required to cause the pickup unit 33 to seek. Further, the control unit 39 reads and writes management information for managing reading and writing of data to and from the optical disc 3 by controlling the signal processing unit 35 by using a predetermined file system. Is supplied to the computer 1 via. Further, the control unit 39 detects a defective sector (defective area) on the optical disk 3 by monitoring the signal processing unit 35, and performs control for coping with the defective sector by the above-described slip processing and reassignment processing. . Then, for the control, the control unit 39 creates the above-described defect list and stores it in, for example, a built-in memory (not shown). Further, the control unit 39 creates a free area list in which the LSNs of the logical sectors that are free areas on the optical disc 3 are described, and stores the list in, for example, a built-in memory.
[0051]
In the drive 2 configured as described above, reading and writing with respect to the optical disc 3 are performed for each data of the ECC block which is a unit of the ECC processing performed by the signal processing unit 35.
[0052]
The ECC block needs to be, for example, one or more integral multiples of a physical sector that is the minimum data read / write unit for the optical disc 3. For example, if the ECC block is 64 KB (Kilo Byte) and the physical sector is 2 KB, the ECC block corresponds to 32 physical sectors.
[0053]
In the drive 2, the slip process and the reassign process are performed, for example, in units of ECC blocks. In this case, if at least one defective sector exists in one or more physical sectors from which data of the ECC block is read / written, all of the one or more physical sectors corresponding to the ECC block are, for example, all defective sectors. .
[0054]
Here, when the slip processing and the reassignment processing are performed in units of ECC blocks, a method of describing all PSNs of one or more physical sectors corresponding to the ECC blocks in the defect list, and, for example, the first physical Although there is a method of describing only the PSN of the sector, either method can be adopted.
[0055]
In the following, for the sake of simplicity, the description will be made assuming that an ECC block corresponds to one physical sector. However, the present invention is applicable regardless of how many physical sectors the ECC block corresponds to.
[0056]
Next, FIG. 8 shows an example of a functional configuration of the computer 1 realized by the CPU 11 of FIG. 6 executing a program.
[0057]
In the computer 1, various application programs are executed under the management of the OS. Further, under the management of the OS, a file system and a device driver operate.
[0058]
When the application program reads or writes data from or to the optical disk 3 mounted on the drive 2, the application program records the data or designates a file on which the data is recorded in a file system. The LSN of the specified file is specified in the device driver. Then, the device driver requests the drive 2 to read and write LSN data from the file system.
[0059]
In the present embodiment, for example, an allocation manager is incorporated in one or both of an application program and a file system, and the allocation manager controls reading and writing of data from and to the optical disk 3 by the drive 2. And share.
[0060]
That is, in the allocation manager, the list acquisition unit 41 acquires the free area list and the defect list from the drive 2, supplies the free area list to the free area list storage unit 42, and stores the defect list in the defect list storage unit 43. To supply.
[0061]
The free area list storage unit 42 stores the free area list supplied from the list acquisition unit 41, for example, overwriting the storage contents. The defect list storage unit 43 stores the defect list supplied from the list acquisition unit 41, for example, overwriting the storage content.
[0062]
The continuous free area list creation unit 44 receives a logical sector start physical sector number (to be described later) from the drive 2, the logical sector start physical sector number, the free area list stored in the free area list storage unit 42, and the defect list. Based on the defect list stored in the storage unit 43, a continuous free area list in which the LSN of a physically continuous free area on the optical disc 3 is described is created and supplied to the continuous free area list storage unit 45.
[0063]
The continuous free area list storage unit 45 stores the continuous free area list supplied from the continuous free area list creation unit 44, for example, overwriting the storage contents.
[0064]
The continuous free area detection unit 46 detects a continuous free area on the optical disc 3 by referring to the continuous free area list stored in the continuous free area list storage unit 45, and sends the data to the data setting unit 47 and the recording control unit 48. Supply.
[0065]
The data to be recorded on the optical disc 3 is supplied to the data setting unit 47. The data setting unit 47 uses the data supplied thereto as a unit for performing ECC (Error Checking and Correction). Data of a large unit is set as attention data to be physically continuously recorded on the optical disc 3 and supplied to the recording control unit 48. The data setting unit 47 sets the data of interest in consideration of the size of the continuous free area supplied from the continuous free area detection unit 46. In addition, as described above, when reading and writing are performed in ECC block units in the drive 2, the data setting unit 47 sets data having a size of a positive integer multiple of the ECC block as attention data.
[0066]
The recording control unit 48 transmits the data of interest supplied from the data setting unit 47 to the drive 2 together with the LSN of the continuous free area supplied from the continuous free area detection unit 46 and the write command instructing data writing. Thus, in the drive 2, the data of interest is written in the continuous free area on the optical disk 3.
[0067]
The data storage unit 49 temporarily stores data and the like necessary for the recording control unit 48 to perform processing.
[0068]
Next, the processing of the drive 2 in FIG. 7 will be outlined with reference to the flowchart in FIG.
[0069]
Various commands are supplied to the drive 2 from the allocation manager shown in FIG. 8 via a file system and a device driver, or from the allocation manager via a device driver. Are received by the I / F controller 38 of the drive 2 and supplied to the control unit 39.
[0070]
Therefore, the control unit 39 first determines whether or not a read command for instructing reading of data from the optical disc 3 has been supplied in step S1.
[0071]
If it is determined in step S1 that the read command has been supplied, the process proceeds to step S2, where the control unit 39 converts the LSN into a PSN. That is, the read command is supplied together with the LSN of the logical sector (group) in which the data to be read from the optical disc 3 is recorded (hereinafter, appropriately referred to as the read LSN). In step S2, the read command is supplied together with the read command. The read LSN to be read is converted to PSN.
[0072]
Then, the process proceeds to step S3, where data is read in ECC block units from the position on the optical disk 3 specified by the PSN obtained in step S2. That is, the control unit 39 controls the servo control unit 32 to move the pickup unit 33 to the position of the optical disc 3 specified by the PSN obtained in step S2. The pickup unit 33 irradiates the optical disc 3 with laser light, receives reflected light of the laser light from the optical disc 3, and outputs an RF signal corresponding to the reflected light via an RF amplifier 34 to a signal processing unit 35. To supply. The signal processing unit 35 demodulates the RF signal supplied thereto, performs ECC processing on data obtained as a result in units of ECC blocks, and supplies the data to the memory controller 36.
[0073]
The memory controller 36 receives the data of the ECC block unit subjected to the ECC processing, and proceeds to step S4, and transfers the data of the ECC block unit to the allocation manager of FIG. 8 via the I / F controller 38. I do.
[0074]
Thereafter, the process proceeds to step S5, and the control unit 39 determines whether or not reading of all data requested by the read command has been completed. If it is determined in step S5 that the reading of the data requested by the read command has not been completed yet, the process returns to step S3, and the same processing is repeated to obtain the data that has not been read yet. Reading is performed.
[0075]
If it is determined in step S5 that reading of all data requested by the read command has been completed, the process returns to step S1, and the same processing is repeated.
[0076]
On the other hand, when it is determined in step S1 that the read command has not been supplied, the process proceeds to step S6, and the control unit 39 determines whether an information request command for requesting information held by the drive 2 has been supplied. I do. If it is determined in step S6 that the information request command has been supplied, the process proceeds to step S7, where the control unit 39 acquires the defect list, the free area list, and the logical sector start physical sector number, and proceeds to step S8. In step S8, the control unit 39 transfers the defect list, the free area list, and the logical sector start physical sector number acquired in step S8 to the allocation manager of FIG. Returning to S1, the same processing is repeated thereafter.
[0077]
If it is determined in step S6 that the information request command has not been supplied, the process proceeds to step S9, and the control unit 39 determines whether a write command for instructing writing (recording) of data on the optical disc 3 has been supplied. Is determined.
[0078]
If it is determined in step S9 that the write command has not been supplied, the process returns to step S1, and the same processing is repeated.
[0079]
If it is determined in step S9 that the write command has been supplied, the process proceeds to step S10, where the control unit 39 converts the LSN into PSN. That is, the write command is supplied together with the LSN of the logical sector (group) in which data is to be written (hereinafter, referred to as the write LSN). In step S10, the write LSN supplied together with the write command is converted to PSN. Is done.
[0080]
Then, the process proceeds to step S11, where the I / F controller 38 receives the data to be written to the optical disc 3 supplied from the allocation manager of FIG. 8, and proceeds to step S12.
[0081]
In step S12, the data received by the I / F controller 38 in step S11 is written in ECC block units from the position on the optical disk 3 specified by the PSN obtained in step S10. That is, the data received by the I / F controller 38 is supplied to the signal processing unit 35 via the memory controller 36. The signal processing unit 35 adds an error correction code for performing ECC processing to the data supplied thereto in units of ECC blocks, modulates the resulting data in units of ECC blocks, and 33.
[0082]
On the other hand, the control unit 39 controls the servo control unit 32 to move the pickup unit 33 to the position of the optical disc 3 specified by the PSN obtained in step S11. The pickup unit 33 irradiates the optical disk 3 with a laser beam corresponding to the signal supplied from the signal processing unit 35, thereby moving the signal processing unit from the position of the optical disk 3 designated by the PSN obtained in step S11. Recording of data in ECC block units obtained in step 35 is started.
[0083]
Thereafter, the process proceeds to step S13, where the control unit 39 determines whether or not there is a defect at the position of the optical disc 3 where data is recorded. That is, the pickup unit 33 simultaneously irradiates the optical disk 3 with the laser light and receives the reflected light of the laser light from the optical disk 3, and outputs an RF signal corresponding to the reflected light to the RF amplifier 34 and the signal The data is supplied to the control unit 39 via the processing unit 35. In step S13, the control unit 39 determines whether there is a defect at the position of the optical disc 3 where data is recorded based on the signal supplied from the pickup unit 33 in this way.
[0084]
If it is determined in step S13 that the optical disc 3 has no defect, the process proceeds to step S14, and the control unit 39 determines whether or not all the data writing requested by the write command has been completed. If it is determined in step S14 that the writing of the data requested by the write command has not been completed, the process returns to step S11, and thereafter, the same processing is repeated, so that the optical disk of the data that has not yet been written is written. 3 is written.
[0085]
If it is determined in step S14 that all the data writing requested by the write command has been completed, the process proceeds to step S15, and the control unit 39 updates the free area list stored in the built-in memory. That is, the control unit 39 deletes the LSN of the logical sector of the optical disk 3 on which data has been written by repeating the processing of steps S11 to S14 from the free area list. After the free area list is updated in step S15 as described above, the process returns to step S1, and the same processing is repeated thereafter.
[0086]
On the other hand, if it is determined in step S13 that the optical disc 3 has a defect, the process proceeds to step S16, and the control unit 39 controls the I / F controller 38 to generate a defect report message indicating that there is a defect. The data is transmitted to the allocation manager shown in FIG. 8, and the process proceeds to step S17. In step S17, the control unit 39 updates the defect list stored in the built-in memory, that is, adds information on the defect of the optical disc 3 found in step S13 to the defect list, and proceeds to step S1. Returning, the same processing is repeated thereafter. Therefore, when there is a defect in the recording area of the optical disk 3 to which data is to be written, the writing of the data is stopped, and a defect report message is transmitted to the allocation manager of FIG.
[0087]
Here, in the embodiment of FIG. 9, the operation of the drive 2 in response to the three commands of the read command, the information request command, and the write command has been described. A command or a delete command for instructing deletion of data (file) recorded on the optical disc 3 can be received. The drive 2 formats the optical disc 3 when receiving the format command, and deletes the data recorded on the optical disc 3 when receiving the delete command.
[0088]
At the time of formatting, the control unit 39 investigates a defect (defective sector) on the optical disc 3 and creates a defect list. Also, at the time of formatting, the allocation manager can specify which of slip processing and reassignment processing is to be adopted as a defect countermeasure, for example. Adopted.
[0089]
Next, the processing of the allocation manager of FIG. 8 will be described.
[0090]
As described above, the allocation manager creates the continuous free area list based on the defect list, the free area list, and the logical sector start physical sector number. It depends on whether the defect list used in the processing is for slip processing or reassignment processing.
[0091]
Therefore, first, with reference to the flowchart of FIG. 10, a description will be given of a slip processing use type continuous free area list creation processing performed using a slip processing defect list.
[0092]
In the continuous free area list creation processing, first, in step S21, the recording control unit 48 transmits an information request command to the drive 2. The drive 2 that has received the information request command returns the defect list, the free area list, and the logical sector start physical sector number to the allocation manager as described with reference to FIG. , A defect list, a free area list, and a logical sector start physical sector number are obtained.
[0093]
That is, the defect list and the free area list transmitted from the drive 2 are received by the list obtaining unit 41, and the list obtaining unit 41 stores the defect list and the free area list in the defect list storage unit 42 and the free area list storage unit. 43 to be stored. The logical sector start physical sector number transmitted from the drive 2 is received by the continuous free area list creating unit 44.
[0094]
Here, in the embodiment of FIG. 10, the defect list stored in the defect list storage unit 42 is used in the slip processing as shown in FIG. It is a list of PSN.
[0095]
Thereafter, the process proceeds to step S23, where the continuous free area list creating unit 44 reads the free area list stored in the free area list storage unit 42, copies the read free area list to the continuous free area list storage unit 45 as a continuous free area list, Proceed to step S24.
[0096]
In step S24, the continuous free area list creation unit 44 sequentially sets each PSN described in the defect list used in the slip processing, which is stored in the defect list 43, as the target PSN and sets the defect specified by the target PSN. The LSN of the logical sector assigned to the normal physical sector immediately before the area (bad sector) is obtained. Further, in step S24, the continuous free area list creation unit 44 registers the LSN as a continuous free area end point LSN representing the LSN of the end point of the continuous free area in association with the PSN of interest in the defect list.
[0097]
Here, the PSN is a number for the drive 2 to specify an actual physical sector on the optical disk 3, and the LSN is a logical number assigned to the physical sector from outside the drive 2 (such as a file system or an application). This is a number for specifying a sector. In the drive 2, if there is no defect in the optical disk 3, a certain physical sector of the optical disk 3 is set as a logical sector start physical sector to start allocating a logical sector. Logical sectors are sequentially allocated from the sector. Therefore, assuming that the PSN of the logical sector start physical sector is the logical sector start physical sector number and that the logical sector start physical sector number is represented by LSN_START, the logical sector is assigned to the logical sector specified by a certain LSN. The PSN of the physical sector that is located is represented, for example, by the following equation.
[0098]
PSN = LSN + LSN_START (1)
[0099]
Further, the LSN of a logical sector assigned to a physical sector specified by a certain PSN is expressed by the following expression from Expression (1).
[0100]
LSN = PSN-LSN_START (2)
[0101]
On the other hand, in the slip processing, a logical sector is not allocated to a defective physical sector (defective sector), and the allocation of the logical sector is slipped to the next normal physical sector. Therefore, if the number of defective sectors existing from the logical sector start physical sector to the physical sector allocated to the logical sector specified by a certain LSN is represented by a function NOS (LSN) (NOS: Number of Slip) defect), the PSN of the physical sector assigned to the logical sector specified by a certain LSN when the slip processing is performed is expressed by the following equation from equation (1).
[0102]
PSN = LSN + LSN_START + NOS (LSN) (3)
[0103]
If the number of defective sectors existing from the logical sector start physical sector to the logical sector allocated to the physical sector specified by a certain PSN is represented by a function NOS (PSN), slip processing is performed. In this case, the LSN of the logical sector allocated to the physical sector specified by a certain PSN is expressed by the following equation from equation (3).
[0104]
LSN = PSN-LSN_START-NOS (PSN) (4)
[0105]
The mutual conversion between PSN and LSN when the slip processing is performed can be performed by Expressions (3) and (4).
[0106]
In the reassignment process, a defective physical sector (defective sector) is substantially replaced by another normal physical sector. However, even if the defective sector is a logical sector, a logical sector is allocated. The conversion between the PSN and the LSN in the case described above can be performed by the equations (1) and (2).
[0107]
The LSN of the logical sector allocated to the normal physical sector immediately before the defective area (physical sector having a defect) specified by the PSN described in the defect list used in the slip processing, that is, the continuous free area end point LSN is Therefore, in step S24, the continuous free area end point LSN is added to the defect list stored in the defect list storage unit 43, as shown in FIG.
[0108]
Here, in the present embodiment, it is assumed that the logical sector start physical sector number LSN_START is, for example, 100, and logical sectors starting from LSN 0 are sequentially allocated from the physical sector with PSN 100.
[0109]
In the embodiment of FIG. 11, physical sectors having PSNs of 107, 134, and 135 are described as defect areas in the defect list. The number of defective areas from the physical sector # 100 which is the logical sector start physical sector to the physical sector # 107 whose PSN is represented by 107 is only one of the physical sectors # 107, and the NOS (PSN) is 1 It becomes. Accordingly, by substituting PSN = 107, LSN_START = 100, and NOS (PSN) = 1 into equation (4), a value of 6 is obtained as the continuous free area end point LSN for physical sector # 107. .
[0110]
The number of defective areas from the logical sector start physical sector # 100 to the physical sector # 134 whose PSN is represented by 134 is two of the physical sector # 134 and the physical sector # 107 described before it. NOS (PSN) is 2. Therefore, by substituting PSN = 134, LSN_START = 100, and NOS (PSN) = 2 into equation (4), 32 is obtained as the continuous free area end point LSN for the physical sector # 134. . Further, the number of defective areas from the logical sector start physical sector # 100 to the physical sector # 135 whose PSN is represented by 135 is the physical sector # 135 and the physical sectors # 107 and # described before it. 134, and NOS (PSN) is 3. Accordingly, by substituting PSN = 135, LSN_START = 100, and NOS (PSN) = 3 into equation (4), 32 is obtained as the continuous free area end point LSN for the physical sector # 135. .
[0111]
Returning to FIG. 10, after the continuous free area end point LSN is registered in association with each PSN of the defect list in step S24, the process proceeds to step S25, and the continuous free area list creation unit 44 determines whether the defect list storage unit The first PSN in the defect list stored in 43 is set as the target PSN, and the process proceeds to step S26. In step S26, the continuous free area list creating unit 44 determines whether the physical sector immediately before the defective area (physical sector) represented by the PSN of interest is a defective area.
[0112]
In step S26, when it is determined that the physical sector immediately before the defective area represented by the PSN of interest is a defective area, that is, the physical sector immediately before the defective area represented by the PSN of interest is a defective area. If the physical sector to be represented cannot be the last physical sector in the continuous free area, steps S27 and S28 are skipped and the process proceeds to step S29.
[0113]
If it is determined in step S26 that the physical sector immediately before the defective area represented by the PSN of interest is not a defective area, the process proceeds to step S27, where the continuous free area list creation unit 44 stores the data in the defect list storage unit 43. In the defect list, it is determined whether or not a continuous free area including the continuous free area end point LSN associated with the PSN of interest exists in the continuous free area list stored in the continuous free area list storage unit 45. In step S27, when it is determined that the continuous free area including the continuous free area end point LSN associated with the PSN of interest in the defect list does not exist in the continuous free area list, step S28 is skipped and step S29 is performed. Proceed to.
[0114]
If it is determined in step S27 that the continuous free area including the continuous free area end point LSN associated with the PSN of interest in the defect list is present in the continuous free area list, the process proceeds to step S28, where the continuous free area is determined. The list creating unit 44 divides the continuous free area including the continuous free area end point LSN into a continuous free area from the head to the continuous free area end point LSN and a continuous free area thereafter.
[0115]
Here, FIG. 12 shows an example of the continuous free area list immediately after the free area list supplied from the drive 2 is copied.
[0116]
The free area list supplied from the drive 2 describes, for example, the head LSN of one or more continuous logical sectors that are free areas and the length (number) of the continuous logical sectors. . In the free area list, for example, it is possible to describe, for example, the LSN at the beginning and the LSN at the end of one or more continuous logical sectors that are free areas.
[0117]
Here, in FIG. 12 (similarly in FIG. 13, FIG. 16, and FIG. 17, which will be described later), in order to make it easy to understand that continuous logical The free area is illustrated by changing the row (stage) for each of the continuous logical sectors (groups). In FIG. 12 (similarly in FIGS. 13, 16 and 17 described later), in addition to the LSN described in the free area list supplied from the drive 2, a PSN corresponding to the LSN (by the LSN) The PSN of the physical sector to which the specified logical sector is assigned is also shown.
[0118]
As described above, the continuous free space list shown in FIG. 12 is a list immediately after the free space list supplied from the drive 2 is copied, that is, the free space list supplied from the drive 2 itself. As described above, the logical sectors constituting each free area are continuous. That is, according to the continuous free area list in FIG. 12, the continuous logical sectors # 1 to # 12 constitute the first level free area from the top, and the continuous logical sectors # 30 to # 37 are the same. This constitutes a second-stage free area.
[0119]
However, the free area represented by the free area list supplied from the drive 2 is not always constituted by continuous physical sectors.
[0120]
That is, assuming that the defect list supplied from the drive 2 is, for example, the one shown in FIG. 11, the physical sectors # 107, # 134, and # 135 of the optical disk 3 have a defect and are assigned logical sectors. Not. Therefore, assuming that the logical sector start physical sector number LSN_START is, for example, 100 as described above, the logical sectors # 1 to # 12 constituting the first-stage free area are originally assigned to the physical sectors # 101 to 112. However, since the physical sector # 107 has a defect, no logical sector is allocated by the slip processing. As a result, the logical sectors # 1 to # 6 are allocated to the physical sectors # 101 to # 106, respectively. The physical sector # 107 slips, and the logical sector # 7 and thereafter are allocated to the physical sector # 108 and thereafter.
[0121]
Therefore, although the free space in the first row of the continuous free space list in FIG. 12 is constituted by the continuous logical sectors # 1 to # 12, it is not constituted by the continuous physical sectors, and the physical sector # It is composed of two consecutive physical sectors 101 to # 106 and physical sectors # 108 to # 113.
[0122]
Therefore, in order to make the first-stage free area in the continuous free-area list in FIG. 12 a physically continuous continuous free area, the first-stage free area is assigned to the continuous physical sectors # 101 to # 106. It is necessary to divide the logical sectors into logical sectors # 1 to # 6 respectively allocated thereto and logical sectors # 7 to # 12 allocated to continuous physical sectors # 108 to # 113, respectively.
[0123]
By the way, the LSN of the last logical sector # 6 among the logical sectors # 1 to # 6 allocated to the continuous physical sectors # 101 to # 106, respectively, is assumed to be the defect shown in FIG. It is registered in the list.
[0124]
Therefore, in step S28 in FIG. 10, the continuous free area list creation unit 44 converts the continuous free area including the continuous free area end point LSN into a continuous free area from the beginning to the continuous free area end point LSN, and a subsequent continuous free area. The area is divided into a plurality of areas, whereby a physically continuous free area is obtained.
[0125]
The first stage free area in the continuous free area list in FIG. 12 is divided into a continuous free area composed of logical sectors # 1 to # 6 and a continuous free area composed of logical sectors # 7 to # 12. Accordingly, the continuous free area list in FIG. 12 is updated as shown in FIG.
[0126]
According to the defect list shown in FIG. 11, continuous physical sectors # 134 and # 135 have defects. When the attention PSN is sequentially set from the first PSN in the defect list, if the free area is divided by the first attention PSN of the continuous physical sectors # 134 and # 135, the physical sector # 134 Since there is no continuous physical sector between # 135, it is not necessary to divide the free area by the physical sector # 135 which will be the PSN of interest later (it cannot be divided). Therefore, in step S26 of FIG. 10, the continuous free area list creation unit 44 determines whether the physical sector immediately before the defective area (physical sector) represented by the target PSN is a defective area, If the physical sector immediately before the area is a defective area, as described above, the processing skips steps S27 and S28 and skips.
[0127]
Referring back to FIG. 10, after the processing in step S28, the process proceeds to step S29, in which the continuous free area list creating unit 44 determines whether the PSN of interest is the last PSN described in the defect list. If it is determined in step S29 that the PSN of interest is not the last PSN described in the defect list, the process proceeds to step S30, where the continuous free area list creating unit 44 writes the PSN of interest next to the PSN of interest in the defect list. The current PSN is newly set as the target PSN, and the process returns to step S26, and the same processing is repeated thereafter.
[0128]
If it is determined in step S29 that the PSN of interest is the last PSN described in the defect list, the continuous free area list creation processing ends.
[0129]
By the above-described continuous free area list creation processing, the continuous free area list in FIG. 12 in which free areas that are logically continuous but may be physically discontinuous are described, A continuous free area list in FIG. 13 in which continuous free areas are described is created.
[0130]
Next, with reference to the flowchart of FIG. 14, a description will be given of a reassignment-use-type continuous free area list creation process performed using a reassignment-use defect list.
[0131]
In the continuous free area list creation processing, first, in step S41, the recording control unit 48 transmits an information request command to the drive 2. The drive 2 that has received the information request command returns the defect list, the free area list, and the logical sector start physical sector number LSN_START to the allocation manager as described with reference to FIG. 9. By receiving them, a defect list, a free area list, and a logical sector start physical sector number LSN_START are obtained.
[0132]
That is, the defect list and the free area list transmitted from the drive 2 are received by the list obtaining unit 41, and the list obtaining unit 41 stores the defect list and the free area list in the defect list storage unit 42 and the free area list storage unit. 43 to be stored. The logical sector start physical sector number transmitted from the drive 2 is received by the continuous free area list creating unit 44.
[0133]
Here, in the embodiment of FIG. 14, the defect list stored in the defect list storage unit 42 is used in the reassignment processing as shown in FIG. It is a list in which PSNs are associated with PSNs of normal physical sectors that can substitute for the physical sectors (hereinafter, appropriately referred to as alternative physical sectors).
[0134]
Thereafter, the process proceeds to step S43, where the continuous free area list creating unit 44 reads the free area list stored in the free area list storage unit 42, and copies it to the continuous free area list storage unit 45 as a continuous free area list. Proceed to step S44.
[0135]
In step S44, the continuous free area list creation unit 44 sequentially sets each PSN of the physical sector having a defect, which is described in the defect list used in the reassignment process and stored in the defect list 43, as a target PSN. The LSN of the logical sector assigned to the defective physical sector specified by the PSN of interest is determined. Further, in step S44, the continuous free area list creating unit 44 registers the LSN in the defect list in association with the PSN of interest as a continuous free area division LSN representing the LSN of a logical sector that divides the continuous free area. .
[0136]
Here, the LSN of the logical sector specified by the PSN of interest and assigned to the physical sector having a defect can be obtained by the above equation (2).
[0137]
Therefore, for example, if the logical sector start physical sector number LSN_START is 100 as described above, in step S44, as shown in FIG. 15, the defect list stored in the defect list storage unit 43 includes A continuous free area division LSN is added.
[0138]
In step S44, after the continuous free area division LSN has been registered in association with each PSN of the physical sector having a defect in the defect list, the process proceeds to step S45, where the continuous free area list creation unit 44 The process proceeds to step S46 with the first continuous free area segment LSN of the defect list stored in the storage unit 43 as the target LSN. In step S <b> 46, the continuous free area list creation unit 44 stores the continuous free area including the LSN of interest in the defect list stored in the defect list storage unit 43 in the continuous free area list stored in the continuous free area list storage unit 45. To determine if it exists. In step S46, when it is determined that the continuous free area including the LSN of interest in the defect list does not exist in the continuous free area list, steps S47 and S48 are skipped, and the process proceeds to step S49.
[0139]
If it is determined in step S46 that the continuous free area including the LSN of interest in the defect list is present in the continuous free area list, the process proceeds to step S47, and the continuous free area list creation unit 44 determines whether the continuous free area including the LSN of interest is included. The free area is divided into a continuous free area from the head to the immediately preceding LSN, an attention LSN, and a continuous free area immediately after the LSN to the end.
[0140]
Here, FIG. 16 shows an example of the continuous free area list immediately after the free area list supplied from the drive 2 is copied.
[0141]
Note that the continuous free area list in FIG. 16 represents the same free area as the continuous free area list shown in FIG. The defect list shown in FIG. 15 also indicates that the same physical sector as the defect list in FIG. 11 has a defect.
[0142]
Therefore, according to the defect list in FIG. 15 and the continuous free area list in FIG. 16, if the logical sector start physical sector number LSN_START is 100 as described above, for example, The sectors # 1 to # 12 are allocated to the physical sectors # 101 to # 112, respectively. However, since the physical sector # 107 has a defect, the physical sector # 107 is replaced by the physical sector # 107 by the reassignment processing. It is replaced with sector # 1 (FIG. 15). Accordingly, the logical sectors # 1 to # 6 are substantially allocated to the continuous physical sectors # 101 to # 106, respectively, and the logical sector # 7 is allocated (reassigned) to the so-called isolated physical sector # 1. , Logical sectors # 8 to # 12 are allocated to consecutive physical sectors # 108 to # 12, respectively.
[0143]
Therefore, although the free space in the first row of the continuous free space list in FIG. 16 is composed of consecutive logical sectors # 1 to # 12, it is not composed of consecutive physical sectors, and the physical sector # It is composed of three blocks of physical sectors (groups) 101 to # 106, physical sector # 1, and physical sectors # 108 to # 113.
[0144]
Therefore, in order to make the first-stage free area in the continuous free-area list in FIG. 16 a physically continuous continuous free area, the first-stage free area is assigned to continuous physical sectors # 101 to # 106. Logical sectors # 1 to # 6 assigned to each, logical sector # 7 substantially assigned to alternative physical sector # 1, and logical sector # 8 assigned to continuous physical sectors # 108 to # 113, respectively. To # 12.
[0145]
By the way, from the first free space in the continuous free space list in FIG. 16, the logical sectors # 1 to # 6 allocated to the continuous physical sectors # 101 to # 106 and the continuous physical sectors # 108 to #, respectively. The LSN of the logical sector # 7, which represents a partition point for dividing the logical sectors # 8 to # 12 assigned to the respective 112, is registered in the defect list shown in FIG. I have.
[0146]
Therefore, in step S47 of FIG. 14, the continuous free area list creation unit 44 converts the continuous free area including the continuous free area segment LSN as the LSN of interest into the continuous free area from the beginning to immediately before the LSN of interest, the LSN of interest, It is divided into a continuous free area from immediately after the LSN of interest to the end, thereby obtaining a continuous free area immediately before the LSN of interest and a continuous free area immediately after the LSN of interest.
[0147]
The first vacant area in the continuous vacant area list in FIG. 16 includes a continuous vacant area composed of logical sectors # 1 to # 6, a vacant area composed only of logical sector # 7, and logical sectors # 7 to # 12. The continuous free area list shown in FIG. 16 is updated as shown in FIG.
[0148]
Returning to FIG. 14, after the processing in step S47, the process proceeds to step S48, in which the continuous free area list creating unit 44 determines whether or not the continuous free area list stored in the continuous free area list storage unit 45 has Reset the flag to 0.
[0149]
That is, in the embodiment of FIG. 14, the continuous free area list creating unit 44, when registering a free area in the continuous free area list, A continuity flag indicating whether a sector is composed of sectors is added. Further, as shown in FIG. 16, the continuity flag is set to, for example, 1 to indicate that the empty area is composed of a plurality of continuous physical sectors. It is designed to be set. On the other hand, the free area represented by the LSN of interest in the continuous free area list is constituted by one physical sector (alternate physical sector) and is not constituted by a plurality of continuous physical sectors. Therefore, the continuous free area list creation unit 44 resets the continuous flag “flag” added to the LSN of interest in the continuous free area list stored in the continuous free area list storage unit 45 in step S48.
[0150]
As described above, when the continuous flag is described in the continuous free area list, the free area registered in the continuous free area list is referred to as a plurality of continuous physical areas only by referring to the continuous flag. It can be quickly determined whether or not a sector is formed.
[0151]
After the process in step S48, the process proceeds to step S49, in which the continuous free area list creating unit 44 determines whether or not the LSN of interest is the last continuous free area section LSN described in the defect list. If it is determined in step S49 that the LSN of interest is not the last continuous free area division LSN described in the defect list, the process proceeds to step S50, where the continuous free area list creation unit 44 sets the next free LSN in the defect list next to the LSN of interest. Is set as a new target LSN, and the process returns to step S46, and the same processing is repeated thereafter.
[0152]
If it is determined in step S49 that the LSN of interest is the last continuous free area division LSN described in the defect list, the continuous free area list creation processing ends.
[0153]
By the above-described continuous free area list creation processing, the continuous free area list shown in FIG. 16 in which free areas that are logically continuous but may be physically discontinuous are described. A continuous free area list shown in FIG. 17 in which continuous continuous free areas are described is created.
[0154]
Next, the allocation manager of FIG. 8 controls writing (recording control) of data to the optical disc 3 with reference to the continuous free area list.
[0155]
Therefore, a write control process by the allocation manager in FIG. 8 will be described with reference to a flowchart in FIG.
[0156]
When writing data to the optical disc 3, data to be recorded on the optical disc 3 is supplied to the data setting unit 47 of the allocation manager.
[0157]
Then, in step S61, the continuous free area detection unit 46 refers to the continuous free area list stored in the continuous free area list storage unit 45, and thereby, physically continuous free areas (consisting of continuous physical sectors). A continuous empty area, which is an empty area to be stored, is supplied to the data setting unit 47 and the recording control unit 48, and the process proceeds to step S62.
[0158]
Note that the continuous free area detection unit 46 detects, for example, the continuous free area described first in the continuous free area list (FIGS. 13 and 17).
[0159]
In step S62, the data setting unit 47 extracts (cuts out) the data of the continuous free space detected in step S61 from (the top of) the data supplied thereto, and continuously writes the data to the optical disc 3. Is set as data to be written to the recording control section 48 and supplied to the recording control section 48.
[0160]
If the size of the continuous free area detected in step S61 is not an integral multiple of the ECC block, in step S62, for example, the size of the continuous free area is smaller than the size of the continuous free area detected in step S61. The data of the maximum size which is an integral multiple of is extracted.
[0161]
Then, the process proceeds to step S63, where the recording control unit 48 issues a write command instructing to write the data supplied from the data setting unit 47 to the continuous free area detected in step S61, by using an LSN representing the continuous free area. At the same time, the data is transmitted to the drive 2 and the process proceeds to step S64. In step S64, the recording control unit 48 transmits the data supplied from the data setting unit 47 to the drive 2, and proceeds to step S65. As a result, in the drive 2, as described with reference to FIG. 9, the data supplied from the recording control unit 48 is recorded in the continuous free area of the optical disc 3 detected in step S61.
[0162]
In step S65, the recording control unit 48 updates the continuous free area list stored in the continuous free area list storage unit 45, and proceeds to step S66.
[0163]
That is, since data is recorded in the continuous empty area detected in step S61, it is not an empty area. Therefore, in step S65, the recording control unit 48 updates the continuous free area by deleting the continuous free area detected in step S61 from the continuous free area list.
[0164]
In step S66, the data setting unit 47 determines whether data to be written on the optical disc 3 still remains. If it is determined in step S66 that data to be written to the optical disc 3 is still left, the process returns to step S61, and the same processing is performed thereafter. Is done.
[0165]
On the other hand, if it is determined in step S66 that there is no data to be written on the optical disc 3, that is, if all the data supplied to the data setting unit 47 has been recorded on the optical disc 3, the process ends.
[0166]
As described above, a physically continuous continuous free area on the optical disc 3 is detected, and data is continuously recorded in the continuous free area. Therefore, when writing to the continuous free area, a seek is performed in the drive 2. Does not occur. Therefore, high bit rate data can be written in real time.
[0167]
The data written on the optical disk 3 as described above is read, for example, in the same manner as in the related art. However, when reading data recorded in the continuous free area, no seek occurs in the drive 2. Therefore, high bit rate data can be read out in real time.
[0168]
Next, according to the write control process of FIG. 18, as described above, no seek occurs at the time of reading / writing data from / to the continuous free area. Therefore, if all data can be recorded in a certain continuous free area, the reading and writing of the data in real time is not hindered by the seek.
[0169]
However, data may be recorded over a plurality of continuous free areas. In this case, when data is read or written from one continuous free area to another continuous free area, a certain continuous When the data read / write target changes from the free area to another continuous free area, a seek occurs in the drive 2.
[0170]
Now, let the maximum seek time (maximum seek time) occurring in drive 2 be T _max [Sec], the data rate of the data recorded on the optical disc 3 as a [bit per second], and the read rate of the drive 2 as b [bit per second]. Consider a case where data can be reproduced in real time.
[0171]
FIG. 19 shows a reproduced data amount which is an integrated data amount of data reproduced at a data rate a, and a read data amount which is an integrated data amount of data read from the optical disk 3 at a read rate b in the drive 2. .
[0172]
As shown in FIG. 19, if the read data amount is equal to or larger than the reproduction data amount, the data recorded on the optical disc 3 can be reproduced in real time.
[0173]
Therefore, in the drive 2, the amount of data read from a certain seek (first seek) to the next seek (second seek) is defined as a segment length. When the segment length is represented by L, the time required to read the data of the segment length L from the optical disc 3 at the read rate b is L / b [sec].
[0174]
Therefore, the maximum seek time T _max T, which is the sum of the time L / b for reading the data of the segment length L from the optical disc 3 _max + L / b, the amount of data reproduced at the data rate a (T _max + L / b) × a is equal to or less than the segment length L, that is, the segment length L is equal to the data amount (T _max If it is + L / b) × a or more, the read data amount becomes equal to or more than the reproduction data amount, and the data recorded on the optical disc 3 can be reproduced in real time.
[0175]
From the above, the data is stored on the optical disc 3 by (T _max If data is physically and continuously recorded for a segment length L of (+ L / b) × a or more, data recorded on the optical disc 3 can be reproduced in real time. Similarly, if data is continuously recorded on the optical disc 3 by the segment length L, the data can be written in real time.
[0176]
The segment length L for reading and writing data in real time is the maximum seek time T _max Is longer the longer.
[0177]
Here, the minimum segment length L for reading and writing data in real time (here, for example, (T _max + L / b) × a or more segment length L) is hereinafter referred to as minimum segment length L as appropriate. However, when the minimum segment length L for reading and writing data in real time is smaller than the length of the ECC block, the minimum segment length L is set to the length of the ECC block. In reality, the minimum segment length L for reading and writing data (in particular, image data) in real time is generally larger than the length of an ECC block.
[0178]
Next, with reference to a flowchart of FIG. 20, a description will be given of a write control process that enables data to be read and written in real time even when data is recorded over a plurality of continuous free areas.
[0179]
In this case, in step S71, the continuous free area detection unit 46 detects the continuous free area having the minimum segment length L or more by referring to the continuous free area list stored in the continuous free area list storage unit 45, and performs data setting. It is supplied to the unit 47 and the recording control unit 48.
[0180]
Thereafter, the process sequentially proceeds to steps S72 to S76, and the same processes as those in steps S62 to S66 in FIG. 18 are performed.
[0181]
Therefore, in this case, a continuous free area of the minimum segment length L or more on the optical disk 3 is detected, and data is continuously recorded in the continuous free area. Even if a seek to an empty area occurs, data can be read and written in real time.
[0182]
Note that the minimum segment length L can be set to an arbitrary value. However, when the minimum segment length L is short, data may not be read or written in real time depending on the seek time. Conversely, when the minimum segment length L is long, it is possible to read and write data in real time even if the seek time is long.
[0183]
Next, in the optical disk 3, a defect may be newly generated after formatting, in addition to a case where a defect occurs. As described above, when a new defect occurs in the optical disc 3, in the conventional drive, data is recorded in a normal physical sector avoiding the defective physical sector by, for example, reassignment processing.
[0184]
However, if the same reassignment processing as that of the conventional drive is performed in the drive 2, the data is recorded over the discontinuous physical sectors due to the reassignment processing, and when accessing the discontinuous physical sectors, the seek operation is performed. Occurs. Therefore, if the recording area where data is recorded immediately before the occurrence of the seek is smaller than the minimum segment length L, the seek may hinder real-time data reproduction.
[0185]
Therefore, as described with reference to FIG. 9, when there is a defect in the recording area (continuous free area) of the optical disk 3 on which data is to be written, the drive 2 stops the writing and sends a defect report message as shown in FIG. 8 to the allocation manager.
[0186]
When the allocation manager receives the defect report message, the allocation manager relocates the data for which the writing has been stopped to a continuous free area equal to or longer than the minimum segment length. Is recorded, thereby preventing real-time data reproduction from being hindered.
[0187]
As described above, upon receiving the defect report message, the allocation manager performs a write control process of relocating the data whose writing has been stopped to a continuous free area equal to or longer than the minimum segment length. Data relocation may be performed using the above-described slip processing or may be performed using the reassignment processing.
[0188]
Therefore, first, with reference to the flowchart of FIG. 21, a description will be given of a write control process of the slip process using type performed by the allocation manager of FIG. 8 by using the slip process.
[0189]
As described with reference to FIG. 18, when writing data to the optical disc 3, data to be recorded on the optical disc 3 is supplied to the data setting unit 47 of the allocation manager.
[0190]
Then, in step S81, the recording control unit 48 sets, for example, 0 as an initial value to a defect flag rep indicating whether or not a defect is found during data recording (writing), and proceeds to step S82.
[0191]
In step S82, the data setting unit 47 extracts (cuts out) data of an integral multiple of the ECC block, which is equal to or longer than the minimum segment length L, from the beginning (head) of the data supplied thereto (cut out). The data is set as attention segment data which is data to be continuously written, and supplied to the recording control unit 48.
[0192]
Thereafter, the process proceeds to step S83, where the continuous free area detection unit 46 detects a continuous free area having a size equal to or larger than the segment data of interest by referring to the continuous free area list stored in the continuous free area list storage unit 45. Are supplied to the data setting unit 47 and the recording control unit 48, and the process proceeds to step S84.
[0193]
In step S84, the recording control unit 48 issues a write command instructing to write the segment data of interest supplied from the data setting unit 47 to the continuous free space detected in step S83, together with the LSN indicating the continuous free space. , Transmitted to the drive 2 and proceeds to step S85. In step S85, the recording control unit 48 transmits the segment data of interest supplied from the data setting unit 47 to the drive 2, and proceeds to step S86. As a result, in the drive 2, the segment data of interest supplied from the recording control unit 48 is recorded in the continuous free area of the optical disc 3 detected in step S83, as described with reference to FIG.
[0194]
In step S86, the recording control unit 48 determines whether or not a defect report message has been transmitted from the drive 2, and when it is determined that the defect report message has been transmitted, that is, when a defect is found in the continuous empty area where the target segment data is to be written. If there is, the recording control unit 48 proceeds to step S87, sets the defect flag rep to, for example, 1 indicating that a defect has been found, and sets the detection of a new continuous free area to the continuous free area detection unit. 46, and the process proceeds to step S88.
[0195]
In step S88, the continuous free area detecting unit 46 refers to the continuous free area list stored in the continuous free area list storage unit 45, and in the continuous free area list, for example, the continuous detected last time for the target segment data. From the continuous free areas described immediately after the free area, a continuous free area having a size equal to or larger than the segment data of interest is newly detected and supplied to the data setting unit 47 and the recording control unit 48.
[0196]
Then, the process returns to step S84, and thereafter, the same processing as in the above-described case is performed. In this case, in the drive 2, the segment data of interest supplied from the recording control unit 48 is recorded in the continuous free area newly detected in step S88 on the optical disc 3, as described with reference to FIG.
[0197]
On the other hand, when it is determined in step S86 that the defect report message has not been transmitted from the drive 2, that is, the target segment data is normally and continuously stored in the physically continuous recording area on the optical disk 3. If recorded, the process proceeds to step S89, where the recording control unit 48 updates the continuous free area list stored in the continuous free area list storage unit 45.
[0198]
Here, in the embodiment of FIG. 21, in steps S83 and S88, a continuous free area having a size equal to or larger than the target segment data is detected. In this case, there are a case where the continuous free area is the same size as the segment data of interest and a case where the continuous free area is larger than the segment data of interest.
[0199]
If the continuous free area has the same size as the segment data of interest, in step S89, the continuous recording area is deleted from the continuous free area list. On the other hand, when the continuous free area is larger than the attention segment data, in step S89, for example, only the size of the attention segment data from the head of the continuous free area is deleted from the continuous free area list.
[0200]
Thereafter, the process proceeds to step S90, and the data setting unit 47 determines whether or not data to be written on the optical disc 3 still remains. If it is determined in step S90 that data to be written to the optical disc 3 still remains, the process proceeds to step S91, where the data setting unit 47 determines whether the ECC of the minimum segment length L equal to or longer than the next minimum segment length L of the data supplied thereto. Data of an integer multiple of the block size is extracted, set as new target segment data, and supplied to the recording control unit 48.
[0201]
Here, as described above, in some cases, the continuous free area detected in the previous step S83 or S88 is larger than the target segment data, and in this case, the target segment data starts from the top of the continuous free area. The remainder except for the size of remains as a continuous free area. If the remaining continuous free area is less than the minimum segment length L, data of the minimum segment length L or more cannot be recorded in the continuous free area, and no data is recorded thereafter. . Therefore, it is not preferable that a continuous free area less than the minimum segment length L remains from the viewpoint of the recording efficiency of the optical disc 3.
[0202]
Therefore, in step S91, the data setting unit 47 recognizes the remaining continuous free area in which the previous segment data of interest has been recorded from the beginning of the continuous free area detected in the previous step S83 or S88, and stores the data in the continuous free area. When the new target segment data is recorded, the new target segment data is set so that the size of the continuous free area remaining as a result of the recording does not become less than the minimum segment length L.
[0203]
Specifically, the data setting unit 47 sets, for example, data of the minimum segment length L as new segment data of interest. However, if the continuous free area remaining after recording the new target segment data of the minimum segment length L in the continuous free area is less than the minimum segment length L, the data setting unit 47 sets the continuous free area to Data of the same size is set as new target segment data.
[0204]
After the new target segment data is set in step S91, the process returns to step S83, and thereafter, the same processing is performed, so that the remaining data is physically continuous data having the minimum segment length L or more. The recorded information is recorded in the recording area of the optical disk 3 which has been set.
[0205]
On the other hand, if it is determined in step S90 that there is no data to be written on the optical disc 3, that is, if all data supplied to the data setting unit 47 has been recorded on the optical disc 3, the process proceeds to step S92. The recording control unit 48 determines whether the defect flag rep is “1”.
[0206]
If it is determined in step S92 that the defect flag rep is not 1, that is, if no defect is found when recording data on the optical disc 3, step S93 is skipped and the write control process ends.
[0207]
If it is determined in step S92 that the defect flag rep is 1, that is, if a defect is found when recording data on the optical disc 3, the process proceeds to step S93, for example, as described in FIG. A continuous free area list creation process is performed, whereby the continuous free area list is updated, and the write control process ends.
[0208]
That is, if a defect is found when recording data on the optical disc 3, the defect list is updated in the drive 2 as described with reference to FIG. When the defect list is updated, the continuous free area may change, so it is necessary to update the continuous free area list based on the updated defect list. Thus, in step S93, the continuous free area list is updated by performing the continuous free area list creation process.
[0209]
According to the write control process of FIG. 21, data is recorded, for example, as shown in FIG.
[0210]
That is, FIG. 22 shows a state in which data Segment1, Segment2, and Segment3 having the minimum segment length L or more are recorded on the optical disk 3 by the write control process of FIG.
[0211]
In FIG. 22, first, the data Segment 1 is recorded in the continuous free area of the optical disc 3. Thereafter, the next data Segment2 is recorded in the continuous free area immediately after the recording of the data Segment1, but a defect is found in the middle of the recording. Therefore, the writing of the data Segment2 is stopped when the defect is found, and immediately, the data Segment2 is slipped and written into the continuous free area immediately after the defect. After that, the next data Segment3 is recorded in the continuous free area immediately after the recording of the data Segment2.
[0212]
As described above, according to the write control process of FIG. 21, when there is a defect in the recording area (continuous free area) of the optical disk 3 on which data is to be written, the writing is stopped, and the defect is immediately performed. Data is recorded immediately after the recording area having the. Therefore, it is possible to prevent data from being recorded in a recording area shorter than the minimum segment length L of the optical disc 3 so that real-time data reproduction is not hindered.
[0213]
In the write control process of FIG. 21, since data is recorded immediately after the defective recording area, seeking from immediately before the defective recording area to immediately thereafter can be performed in a short time.
[0214]
Next, another embodiment of the write control process of the slip process utilizing type performed by the allocation manager of FIG. 8 by using the slip process will be described with reference to the flowchart of FIG.
[0215]
In the embodiment of FIG. 21, when a defect of the optical disk 3 is found at the time of writing data, the writing of the data is stopped, and the data is immediately re-read immediately after the defective recording area. Although the data is arranged, in the embodiment of FIG. 23, the data is rearranged after the recording of all the data is completed.
[0216]
That is, as described with reference to FIG. 18, when writing data to the optical disc 3, data to be recorded on the optical disc 3 is supplied to the data setting unit 47 of the allocation manager.
[0217]
Then, in step S101, the recording control unit 48 sets 0 as an initial value to the defect flag rep, and proceeds to step S102.
[0218]
In step S102, the data setting unit 47 extracts, from the head of the data supplied thereto, data having a size equal to or greater than the minimum segment length L and an integral multiple of the ECC block as in step S82 of FIG. Then, the data is set as attention segment data which is data to be continuously written on the optical disc 3, and is supplied to the recording control unit 48.
[0219]
Then, proceeding to step S103, the recording control unit 48 determines whether a defect report message has been transmitted from the drive 2 during the previous writing of the target segment data.
[0220]
If it is determined in step S103 that the defect report message has not been transmitted from the drive 2 during the previous writing of the target segment data, that is, if there is a defect in the recording area of the optical disc 3 where the previous target segment data was to be written. If the previous segment data of interest can be recorded on the optical disc 3 without any error, the process proceeds to step S104, where the continuous free area detection unit 46 refers to the continuous free area list stored in the continuous free area list storage unit 45. By doing so, a continuous free area larger than the segment data of interest is detected and supplied to the data setting unit 47 and the recording control unit 48, and the process proceeds to step S106.
[0221]
Also, in step S103, when it is determined that a defect report message has been transmitted from the drive 2 during the previous writing of the target segment data, that is, when a defect was found in the recording area of the optical disc 3 where the previous target segment data was to be written. If the writing has been stopped and the previous segment data of interest could not be recorded on the optical disc 3, the process proceeds to step S105, where the continuous free area detection unit 46 stores the data in the continuous free area list storage unit 45. By referring to the continuous free area list, a continuous free area having a size equal to or larger than the previous target segment data immediately after the defective area discovered at the time of writing the previous target segment data is detected, and the continuous free area is detected. From the beginning of the area, the size of the previous segment data of interest Last contiguous free space for writing target segment data later (hereinafter, appropriately referred reserved area) is reserved as.
[0222]
In step S105, the continuous free area detection unit 46 registers that the continuous free area set as the reserved area is a reserved area in the continuous free area list stored in the continuous free area list storage unit 45.
[0223]
Further, in step S105, the continuous free area detection unit 46 detects a continuous free area having a size equal to or larger than the segment data of interest, which is located after the reserved area, by referring to the continuous free area list. The data is supplied to the recording control unit 48, and the process proceeds to step S106.
[0224]
In step S106, the recording control unit 48 outputs a write command instructing to write the segment data of interest supplied from the data setting unit 47 to the continuous free space detected in step S104 or S105, and indicates the continuous free space. The data is transmitted to the drive 2 together with the LSN, and the process proceeds to step S107. In step S107, the recording control unit 48 transmits the target segment data supplied from the data setting unit 47 to the drive 2, and proceeds to step S108. Thus, in the drive 2, as described with reference to FIG. 9, the target segment data supplied from the recording control unit 48 is recorded in the continuous free area of the optical disc 3 detected in step S104 or S105.
[0225]
In step S108, the recording control unit 48 determines whether or not a defect report message has been transmitted from the drive 2, and when it is determined that the defect report message has been transmitted, that is, when a defect is found in the continuous empty area where the target segment data is to be written. If there is, the recording control unit 48 proceeds to step S110, sets the defect flag rep to 1 indicating that a defect has been found, for example, and proceeds to step S111.
[0226]
In step S111, the recording control unit 48 saves the target segment data in the spare area, and proceeds to step S112. That is, the data storage unit 49 is provided with a spare area for temporarily saving data to be recorded on the optical disc 3, and in step S111, the recording control unit 48 determines that a defect is found. Thus, the target segment data that could not be recorded on the optical disk 3 is stored (evacuated) in the spare area, and the process proceeds to step S112.
[0227]
On the other hand, when it is determined in step S108 that the defect report message has not been transmitted from the drive 2, that is, the target segment data is normally and continuously stored in the physically continuous recording area on the optical disk 3. If recorded, the process proceeds to step S109, and the recording control unit 48 updates the continuous free area list stored in the continuous free area list storage unit 45 as in step S89 of FIG. move on.
[0228]
In step S112, the data setting unit 47 determines whether data to be written on the optical disc 3 still remains. If it is determined in step S112 that data to be written to the optical disc 3 still remains, the process proceeds to step S113, and the data setting unit 47 determines whether the data supplied to the optical disc 3 is the same as in step S91 of FIG. The data having a size equal to or longer than the minimum segment length L and equal to an integral multiple of the ECC block is extracted, set as new target segment data, and supplied to the recording control unit 48.
[0229]
Then, the process returns to step S103, and thereafter, the same processing is performed, whereby the remaining data is recorded in the physically continuous recording area of the optical disk 3 having the minimum segment length L or more.
[0230]
On the other hand, if it is determined in step S112 that there is no data to be written on the optical disc 3, that is, all the data supplied to the data setting unit 47 has been recorded on the optical disc 3 (or recorded on the spare area). If so, the process proceeds to step S114, and the recording control unit 48 determines whether the defect flag rep is 1.
[0231]
If it is determined in step S114 that the defect flag rep is not 1, that is, if no defect is found when recording data on the optical disk 3, steps S115 and S116 are skipped, and the write control process ends. I do.
[0232]
When it is determined in step S114 that the defect flag rep is 1, that is, when data is recorded on the optical disc 3, a defect is found and the data set as the target segment data at that time is stored in the data storage unit. If it is stored in the spare area of No. 49, the process proceeds to step S115, where a rewrite process of recording the data stored in the spare area in a physically continuous recording area of the optical disc 3 is performed, and the process proceeds to step S116. move on. The details of the rewriting process will be described later.
[0233]
In step S116, for example, as in step S93 in FIG. 21, the continuous free area list creation processing described in FIG. 14 is performed, whereby the continuous free area list is updated, and the write control processing ends. .
[0234]
Next, the rewriting process performed in step S115 in FIG. 23 will be described with reference to the flowchart in FIG.
[0235]
The data stored in the spare area of the data storage unit 49 and having a length equal to or longer than the minimum segment length L as the target segment data is hereinafter referred to as segment data as appropriate.
[0236]
In the rewriting process, first, in step S121, the data setting unit 47 extracts (reads) the first segment data stored in the spare area of the data storage unit 49, sets it as target segment data, and records it. It is supplied to the control unit 48.
[0237]
Thereafter, the process proceeds to step S122, where the continuous free area detection unit 46 refers to the continuous free area list stored in the continuous free area list storage unit 45, and determines the reserved area secured for recording the segment data of interest. Is detected and supplied to the data setting unit 47 and the recording control unit 48, and the process proceeds to step S123.
[0238]
In step S123, the recording control unit 48 issues a write command instructing to write the target segment data supplied from the data setting unit 47 to the continuous free space detected in step S122, together with the LSN indicating the continuous free space. Is transmitted to the drive 2, and the process proceeds to step S124. In step S124, the recording control unit 48 transmits the target segment data supplied from the data setting unit 47 to the drive 2, and proceeds to step S125. As a result, in the drive 2, the segment data of interest supplied from the recording control unit 48 is recorded in the continuous free area, which is the spare area, of the optical disc 3 as described with reference to FIG.
[0239]
In step S125, the recording control unit 48 determines whether a defect report message has been transmitted from the drive 2, and when it is determined that the defect report message has been transmitted, that is, when a defect is found in the continuous empty area where the target segment data is to be written. If there is, the recording control unit 48 proceeds to step S126, and detects a new continuous free area (continuous free area that is not a reserved area) having a size equal to or larger than the segment data of interest by referring to the continuous free area list. Are supplied to the data setting unit 47 and the recording control unit 48.
[0240]
Then, the process returns to step S123, and thereafter, the same processing as in the above-described case is performed. In this case, in the drive 2, as described with reference to FIG. 9, the target segment data supplied from the recording control unit 48 is recorded on the continuous free area of the optical disc 3 newly detected in step S126. That is, when there is a defect in the continuous free area that is the reserved area, a new continuous free area at an arbitrary position on the optical disk 3 is detected by referring to the continuous free area list, and the new free area is detected. The segment data of interest is recorded in such a continuous free area.
[0241]
As described above, when there is a defect in the continuous free area, a process of detecting a new continuous free area at an arbitrary position on the optical disc 3 and recording the target segment data in the new continuous free area. Is equivalent to a write control process using a reassignment process described later.
[0242]
On the other hand, when it is determined in step S125 that the defect report message has not been transmitted from the drive 2, that is, the target segment data is normally stored in the reserved area which is a physically continuous recording area on the optical disc 3. If the recording is continuously performed, the process proceeds to step S127, and the recording control unit 48 updates the continuous free area list stored in the continuous free area list storage unit 45.
[0243]
That is, in step S127, the continuous free area in which the target segment data transmitted in step S124 is recorded is deleted from the continuous free area list.
[0244]
Thereafter, the process proceeds to step S128, where the data setting unit 47 determines whether or not segment data that has not been written on the optical disc 3 still remains in the spare area. If it is determined in step S128 that the segment data that has not been written to the optical disc 3 still remains, the process proceeds to step S129, where the data setting unit 47 sets the next segment data of the target segment data stored in the spare area. Is extracted, set as new target segment data, and supplied to the recording control unit 48.
[0245]
Then, the process returns to step S122, and thereafter, the same processing is performed. As a result, the remaining segment data is recorded in the physically continuous recording area of the optical disk 3 having the minimum segment length L or more.
[0246]
On the other hand, if it is determined in step S128 that no segment data that has not been written on the optical disc 3 remains, that is, if all the segment data stored in the spare area has been recorded on the optical disc 3, the process returns.
[0247]
According to the write control process of FIG. 23, data is recorded, for example, as shown in FIG.
[0248]
That is, FIG. 25 shows a state in which data Segment1, Segment2, and Segment3 having the minimum segment length L or more are recorded on the optical disc 3 by the write control process of FIG.
[0249]
In FIG. 25, first, the data Segment1 is recorded in the continuous free area of the optical disc 3. Thereafter, the next data Segment2 is recorded in the continuous free area immediately after the recording of the data Segment1, but a defect is found in the middle of the recording. Therefore, the writing of the data Segment2 is stopped when a defect is found, and the data Segment2 is saved in the spare area.
[0250]
Thereafter, a continuous free area of the same size as the data segment 2 is secured as a reserved area in the continuous free area immediately after the defect, and the next data segment 3 is recorded in the continuous free area immediately after the reserved area.
[0251]
As described above, after the recording (trial) of the data Segment1, Segment2, and Segment3 is completed, the data Segment2 saved in the spare area is recorded in the continuous free area which is the reserved area.
[0252]
As described above, according to the write control process of FIG. 23, if there is a defect in the recording area (continuous free area) of the optical disk 3 on which data is to be written, the writing is stopped and the defective recording is performed. Immediately after the area, a continuous free area for recording the data for which writing has been stopped is secured as a reserved area, and the data for which writing has been stopped is saved in a spare area. Then, after writing (trying) of all data to be written to the optical disc 3 is completed, the data saved in the spare area is written to the reserved area. Therefore, even in the write control process of FIG. 23, it is possible to prevent the real-time data reproduction from being hindered by recording data in the recording area shorter than the minimum segment length L of the optical disc 3.
[0253]
Further, in the write control process of FIG. 23, after all the data to be written to the optical disk 3 has been written, the data evacuated to the spare area is written to the reserved area, so that a large load on the drive 2 is prevented. can do.
[0254]
In the write control process of FIG. 23 as well, the data is recorded immediately after the defective recording area, as in the case of FIG. 21, so that the seek from immediately before the defective recording area to immediately thereafter is performed. It is possible in a short time.
[0255]
Next, with reference to a flowchart of FIG. 26, a description will be given of a write control process using the reassignment process performed by the allocation manager of FIG. 8 by using the reassignment process.
[0256]
As described with reference to FIG. 18, when writing data to the optical disc 3, data to be recorded on the optical disc 3 is supplied to the data setting unit 47 of the allocation manager.
[0257]
Then, in step S141, the recording control unit 48 sets 0 as an initial value to the defect flag rep, and proceeds to step S142.
[0258]
In step S142, the data setting unit 47 extracts, from the beginning of the data supplied thereto, data having a size equal to or greater than the minimum segment length L and an integral multiple of the ECC block as in step S82 of FIG. Then, the data is set as attention segment data which is data to be continuously written on the optical disc 3, and is supplied to the recording control unit 48.
[0259]
Thereafter, the process proceeds to step S143, where the continuous free area detection unit 46 detects a continuous free area having a size equal to or larger than the segment data of interest by referring to the continuous free area list stored in the continuous free area list storage unit 45. Is supplied to the data setting unit 47 and the recording control unit 48, and the process proceeds to step S144.
[0260]
In step S144, the recording control unit 48 issues a write command for writing the segment data of interest supplied from the data setting unit 47 to the continuous free space detected in step S143, together with the LSN representing the continuous free space. , To the drive 2, and the process proceeds to step S145. In step S145, the recording control unit 48 transmits the target segment data supplied from the data setting unit 47 to the drive 2, and proceeds to step S146. Thus, in the drive 2, as described with reference to FIG. 9, the target segment data supplied from the recording control unit 48 is recorded in the continuous free area of the optical disc 3 detected in step S143.
[0261]
In step S146, the recording control unit 48 determines whether or not a defect report message has been transmitted from the drive 2, and when it is determined that the defect report message has been transmitted, that is, when a defect is found in the continuous empty area where the target segment data is to be written. If there is, the recording control unit 48 sets the defect flag rep to 1 indicating that a defect has been found, and notifies the continuous free area detection unit 46 of the detection of a new continuous free area. Request and return to step S143.
[0262]
In this case, in step S143, the continuous free area detection unit 46 refers to the continuous free area list stored in the continuous free area list storage unit 45, and notifies the continuous free area list with a defect report message having a size equal to or larger than the segment data of interest. An arbitrary continuous free area having no defect is newly detected and supplied to the data setting unit 47 and the recording control unit 48.
[0263]
If there is a defect in the optical disc 3, the continuous free area detected in step S143 may be any continuous free area on the optical disc 3 as long as it is not a continuous free area having the defect. .
[0264]
Further, in the continuous free area list, the continuous free area described therein is divided into a continuous free area for normal recording and a continuous recording area for relocation when a defect is found, and In the case of (1), the continuous free area for writing the segment data of interest is detected from the continuous free area for normal recording, and if the optical disc 3 has a defect, the continuous segment free area is read from the continuous recording area for relocation. It is possible to detect a continuous free area for writing data.
[0265]
After a new continuous free area is detected in step S143, the process proceeds to step S144, and the recording control unit 48 replaces the target segment data supplied from the data setting unit 47 with the new continuous free area detected in step S143. A write command instructing writing to the area is transmitted to the drive 2 together with the LSN indicating the continuous free area, and the process proceeds to step S145. In step S145, the recording control unit 48 transmits the attention segment data supplied from the data setting unit 47 to the drive 2 again, and proceeds to step S146. As a result, in the drive 2, as described with reference to FIG. 9, the target segment data supplied from the recording control unit 48 is recorded in the new continuous free area of the optical disc 3 detected in step S143.
[0266]
On the other hand, when it is determined in step S146 that the defect report message has not been transmitted from the drive 2, that is, the target segment data is normally and continuously stored in the physically continuous recording area on the optical disc 3. If recorded, the process proceeds to step S148, and the recording control unit 48 updates the continuous free area list stored in the continuous free area list storage unit 45, as in step S89 in FIG. 21, and proceeds to step S149. .
[0267]
In step S149, the data setting unit 47 determines whether data to be written to the optical disc 3 still remains. If it is determined in step S149 that data to be written to the optical disc 3 still remains, the process proceeds to step S150, and the data setting unit 47 determines whether the data supplied to the optical disk 3 is the same as in step S91 of FIG. The data having a size equal to or longer than the minimum segment length L and equal to an integral multiple of the ECC block is extracted, set as new target segment data, and supplied to the recording control unit 48.
[0268]
Then, the process returns to step S143, and thereafter, the same processing is performed, whereby the remaining data is recorded in the physically continuous recording area of the optical disk 3 having the minimum segment length L or more.
[0269]
On the other hand, if it is determined in step S149 that there is no data to be written on the optical disc 3, that is, if all the data supplied to the data setting unit 47 has been recorded on the optical disc 3, the process proceeds to step S151. The recording control unit 48 determines whether the defect flag rep is “1”.
[0270]
If it is determined in step S151 that the defect flag rep is not 1, that is, if no defect is found when recording data on the optical disc 3, step S152 is skipped and the write control process ends.
[0271]
If it is determined in step S151 that the defect flag rep is 1, that is, if a defect is found when recording data on the optical disc 3, the process proceeds to step S152, for example, in step S93 in FIG. As in the case of, the continuous free area list creation processing described with reference to FIG. 14 is performed, whereby the continuous free area list is updated, and the write control processing ends.
[0272]
According to the write control process of FIG. 26, data is recorded, for example, as shown in FIG.
[0273]
That is, FIG. 27 shows a state in which data Segment1, Segment2, and Segment3 having the minimum segment length L or more are recorded on the optical disc 3 by the write control process of FIG.
[0274]
In FIG. 27, first, the data Segment1 is recorded in the continuous free area of the optical disc 3. Thereafter, the next data Segment2 is recorded in the continuous free area immediately after the recording of the data Segment1, but a defect is found in the middle of the recording. Therefore, the writing of the data Segment2 is stopped when a defect is found, and a continuous free area at an arbitrary position on the optical disk 3 is newly detected. Then, immediately after the defect is found, the data Segment2 is reassigned and written into a new continuous free area, so to speak. After that, the next data segment 3 is recorded in, for example, a continuous free area of the optical disc 3 immediately after the defective recording area.
[0275]
As described above, according to the write control process of FIG. 26, if there is a defect in the recording area (continuous free area) of the optical disk 3 on which data is to be written, the writing is stopped and a new Data is recorded in the continuous free area. Therefore, it is possible to prevent data from being recorded in a recording area shorter than the minimum segment length L of the optical disc 3 so that real-time data reproduction is not hindered.
[0276]
In the write control process of FIG. 26, the seek time can be shortened when a new continuous free area detected when a defect is found is closer to the position of the defect.
[0277]
Next, another embodiment of the write control process using the reassignment process performed by the allocation manager in FIG. 8 using the reassignment process will be described with reference to the flowchart in FIG.
[0278]
In the embodiment of FIG. 26, when a defect of the optical disk 3 is found at the time of writing data, the writing of the data is stopped, and the data is immediately relocated to a new continuous recording area. However, in the embodiment of FIG. 28, data relocation is performed after the end of recording of all data, as in the case of FIG.
[0279]
That is, as described with reference to FIG. 18, when writing data to the optical disc 3, data to be recorded on the optical disc 3 is supplied to the data setting unit 47 of the allocation manager.
[0280]
Then, in step S161, the recording control unit 48 sets 0 as an initial value to the defect flag rep, and proceeds to step S162.
[0281]
In step S162, the data setting unit 47 extracts, from the beginning of the data supplied thereto, data having a size equal to or greater than the minimum segment length L and an integral multiple of the ECC block, as in step S142 of FIG. Then, the data is set as attention segment data which is data to be continuously written on the optical disc 3, and is supplied to the recording control unit 48.
[0282]
Then, proceeding to step S163, the continuous free area detection unit 46 detects a continuous free area having a size equal to or larger than the target segment data by referring to the continuous free area list stored in the continuous free area list storage unit 45. Are supplied to the data setting unit 47 and the recording control unit 48, and the process proceeds to step S164.
[0283]
In step S164, the recording control unit 48 sends a write command instructing to write the segment data of interest supplied from the data setting unit 47 to the continuous free space detected in step S163, together with the LSN indicating the continuous free space. , To the drive 2, and the process proceeds to step S165. In step S165, the recording control unit 48 transmits the target segment data supplied from the data setting unit 47 to the drive 2, and proceeds to step S166. As a result, in the drive 2, the segment data of interest supplied from the recording control unit 48 is recorded in the continuous free area of the optical disc 3 detected in step S163, as described with reference to FIG.
[0284]
In step S166, the recording control unit 48 determines whether or not a defect report message has been transmitted from the drive 2, and when it is determined that the defect report message has been transmitted, that is, when a defect is found in the continuous empty area where the target segment data is to be written. If there is, the recording control unit 48 proceeds to step S167, sets the defect flag rep to, for example, 1 indicating that a defect has been found, and proceeds to step S168.
[0285]
In step S168, the recording control unit 48 saves the target segment data in the spare area of the data storage unit 49 as in step S111 in FIG. 23, and proceeds to step S170.
[0286]
On the other hand, when it is determined in step S166 that the defect report message has not been transmitted from the drive 2, that is, the target segment data is normally and continuously stored in the physically continuous recording area on the optical disc 3. If recorded, the process proceeds to step S169, and the recording control unit 48 updates the continuous free area list stored in the continuous free area list storage unit 45 as in step S148 in FIG. move on.
[0287]
In step S170, the data setting unit 47 determines whether data to be written to the optical disc 3 still remains. If it is determined in step S170 that data to be written on the optical disc 3 still remains, the process proceeds to step S171, and the data setting unit 47 determines whether the data supplied to the optical disk 3 is the same as in step S150 of FIG. The data having a size equal to or longer than the minimum segment length L and equal to an integral multiple of the ECC block is extracted, set as new target segment data, and supplied to the recording control unit 48.
[0288]
Then, the process returns to step S163, and thereafter, the same processing is performed. As a result, the remaining data is recorded in the physically continuous recording area of the optical disk 3 having the minimum segment length L or more.
[0289]
On the other hand, if it is determined in step S170 that there is no data to be written on the optical disc 3, that is, if all the data supplied to the data setting unit 47 has been recorded on the optical disc 3, the process proceeds to step S172. The data setting unit 47 determines whether or not segment data that has not been written to the optical disc 3 exists in the spare area among the segment data that is longer than the minimum segment length L that has been set as the target segment data.
[0290]
If it is determined in step S172 that the segment data that has not been written to the optical disc 3 exists in the spare area, the process proceeds to step S173, and the data setting unit 47 determines that the segment data stored in the spare area is Is set as segment data of interest and supplied to the recording control unit 48.
[0291]
Then, the process returns to step S163, and the continuous free area list stored in the continuous free area list storage unit 45 is stored in the continuous free area list storage unit 45 in the same manner as in step S143 of FIG. 26 performed when a defect is found. , An arbitrary continuous free area having a size equal to or larger than the segment data of interest and having no defect notified by the defect report message is detected and supplied to the data setting unit 47 and the recording control unit 48. Then, the process proceeds to step S164, in which the same processing is performed, whereby the segment data saved in the spare area is recorded in the physically continuous recording area of the optical disk 3 having the minimum segment length L or more.
[0292]
On the other hand, if it is determined in step S172 that segment data not written on the optical disc 3 does not exist in the spare area, that is, if all the segment data stored in the spare area has been recorded on the optical disc 3, step S174 The recording control unit 48 determines whether the defect flag rep is 1 or not.
[0293]
If it is determined in step S174 that the defect flag rep is not 1, that is, if no defect is found when recording data on the optical disc 3, step S175 is skipped and the write control process ends.
[0294]
If it is determined in step S174 that the defect flag rep is 1, that is, if a defect is found when recording data on the optical disc 3, the process proceeds to step S175, for example, in step S152 in FIG. As in the case of, the continuous free area list creation processing described with reference to FIG. 14 is performed, whereby the continuous free area list is updated, and the write control processing ends.
[0295]
According to the write control process of FIG. 28, data is recorded, for example, as shown in FIG.
[0296]
That is, FIG. 29 shows a state in which the data Segment1, Segment2, and Segment3 having the minimum segment length L or more are recorded on the optical disc 3 by the write control process of FIG.
[0297]
In FIG. 29, first, the data Segment1 is recorded in the continuous free area of the optical disc 3. Thereafter, the next data Segment2 is recorded in the continuous free area immediately after the recording of the data Segment1, but a defect is found in the middle of the recording. Therefore, the writing of the data Segment2 is stopped when a defect is found, and the data Segment2 is saved in the spare area.
[0298]
After that, the next data Segment3 is recorded in the continuous empty area immediately after the defect, and the data saved in the spare area after the recording (trial) of the data Segment1, Segment2, and Segment3 is completed as described above. Segment2 is recorded in a newly detected continuous free area having no defect.
[0299]
As described above, according to the write control process of FIG. 28, if there is a defect in the recording area (continuous free area) of the optical disk 3 on which data is to be written, the writing is stopped and the writing is stopped. Data is saved in the spare area. Then, after writing (trying) of all data to be written to the optical disc 3 is completed, the data saved in the spare area is written to the newly detected continuous free area. Therefore, even in the write control processing of FIG. 28, it is possible to prevent the real-time data reproduction from being hindered by recording data in the recording area shorter than the minimum segment length L of the optical disc 3.
[0300]
Further, in the write control process of FIG. 28, after the writing of all the data to be written to the optical disk 3 is completed, the evacuated data is written to the spare area, so that a large load on the drive 2 can be prevented. .
[0301]
For example, in the write control process using the slip process described with reference to FIGS. 21 and 22, as shown in FIG. 22, when the data Segment1 is recorded, when the next data Segment2 is recorded, a defect is found. Data Segment2 is slipped and written in the continuous empty area immediately after the data area. In this case, the recording area immediately after the recording area where the data Segment1 is recorded to the position of the defect is discarded and used for data recording. May not be done.
[0302]
Therefore, when a defect is found during the recording of the data Segment2, the entire data Segment2 is not slipped. For example, as shown in FIG. The portion written in ECC block units can be made valid as it is, and only the remaining portion can be slipped to the continuous free space immediately after the defect.
[0303]
That is, in FIG. 30, first, the data Segment 1 is recorded in the continuous free area of the optical disc 3. Thereafter, the next data Segment2 is recorded in the continuous free area immediately after the recording of the data Segment1, but a defect is found in the middle of the recording. For this reason, the writing of the data Segment2 is interrupted when writing can be performed in ECC block units until the defect is found, and the rest of the data Segment2 is slipped and written in the continuous free area immediately after the defect. After that, the next data Segment3 is recorded in the continuous free area immediately after the recording of the data Segment2.
[0304]
In this case, the recording area of the optical disk 3 can be effectively used. In this case, since data may be recorded in a recording area shorter than the minimum segment length L of the optical disc 3, real-time reproduction may be hindered by occurrence of a seek. However, by setting the segment data of interest to be somewhat larger than the minimum segment length L, it is possible to reduce the probability that real-time reproduction is prevented when a seek occurs.
[0305]
In the case described above, a recording control process of always recording data having a length equal to or greater than the minimum segment length L in a physically continuous recording area on the optical disc 3 is performed, so that real-time reproduction of data is guaranteed. However, it is not always necessary to perform such recording control.
[0306]
That is, for data that requires real-time reproduction, recording control that guarantees real-time reproduction as described above is performed, and for data that does not require real-time reproduction, for example, the same recording control as in the related art is performed. Is possible.
[0307]
Specifically, for data that is not required to be reproduced in real time, for example, the recording is performed on the optical disk 3 on the drive 2 side in the same manner as in the related art without performing any processing in the allocation manager. can do. In this case, if the optical disc 3 has a defect, the drive 2 deals with the defect by a conventional reassignment process. In this case, the allocation manager obtains the latest free area list and the defect list from the drive 2 and prepares for the continuous free space in FIG. It is desirable to update the continuous free area list by performing the area list creation processing.
[0308]
In addition, the drive 2 can be unmounted from the computer 1. When the drive 2 is unmounted, a defect list or a continuous free area list managed (stored) by the allocation manager can be transferred to the drive 2.
[0309]
Although the present invention has been described with reference to the case where data is recorded on the optical disk 3, the present invention relates to a disk-shaped recording medium such as a magnetic disk or a magneto-optical disk other than the optical disk 3, and a tape-shaped recording medium such as a magnetic tape. The present invention is also applicable to a case where data is recorded on a recording medium, a semiconductor memory, or the like.
[0310]
In the present embodiment, one physical sector (logical sector) corresponds to one ECC block for simplicity of description. However, the present invention provides that an ECC block is composed of a plurality of physical sectors. Further, the present invention is applicable to a case where reading and writing in the drive 2 and management of the free area list and the defect list are performed in units of such ECC blocks including a plurality of physical sectors.
[0311]
【The invention's effect】
As described above, according to the present invention, high bit rate data can be reproduced in real time.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a slip process.
FIG. 2 is a diagram showing a defect list used in a slip process.
FIG. 3 is a diagram illustrating a reassignment process.
FIG. 4 is a diagram showing a defect list used in a reassignment process.
FIG. 5 is a block diagram illustrating a configuration example of an embodiment of a recording / reproducing system to which the present invention has been applied.
FIG. 6 is a block diagram illustrating a hardware configuration example of a computer 1.
FIG. 7 is a block diagram illustrating a hardware configuration example of a drive 2.
FIG. 8 is a block diagram illustrating a functional configuration example of an allocation manager.
FIG. 9 is a flowchart illustrating processing of a drive 2.
FIG. 10 is a flowchart illustrating a continuous free area list creation process using a slip process.
FIG. 11 is a diagram showing a defect list used in a continuous free area list creation process using a slip process.
FIG. 12 is a diagram showing a continuous free area list immediately after the free area list is copied.
FIG. 13 is a diagram showing a continuous free area list created in a continuous free area list creation process using a slip process.
FIG. 14 is a flowchart illustrating a continuous free area list creation process using a reassignment process.
FIG. 15 is a diagram showing a defect list used in a continuous free area list creation process using a reassignment process.
FIG. 16 is a diagram showing a continuous free area list immediately after the free area list is copied.
FIG. 17 is a diagram illustrating a continuous free area list created in a continuous free area list creation process using a reassignment process.
FIG. 18 is a flowchart illustrating a first embodiment of a write control process performed by an allocation manager.
FIG. 19 is a diagram showing a reproduction data amount and a read data amount.
FIG. 20 is a flowchart illustrating a second embodiment of the write control process performed by the allocation manager.
FIG. 21 is a flowchart illustrating a third embodiment of the write control process performed by the allocation manager.
FIG. 22 is a diagram illustrating a third embodiment of the write control process by the allocation manager.
FIG. 23 is a flowchart illustrating a fourth embodiment of the write control process performed by the allocation manager.
FIG. 24 is a flowchart illustrating a rewriting process performed by the allocation manager.
FIG. 25 is a diagram for explaining a fourth embodiment of the write control process by the allocation manager.
FIG. 26 is a flowchart illustrating a write control process performed by an allocation manager according to a fifth embodiment;
FIG. 27 is a diagram illustrating a fifth embodiment of the write control process by the allocation manager.
FIG. 28 is a flowchart illustrating a sixth embodiment of the write control process performed by the allocation manager.
FIG. 29 is a diagram illustrating a sixth embodiment of the write control process by the allocation manager.
FIG. 30 is a diagram illustrating a data writing method for improving recording efficiency.
[Explanation of symbols]
1 computer, 2 drive, 3 optical disk, 4 signal input / output device, 11 CPU, 12 ROM, 13 memory controller, 14 RAM, 15 HD, 16 input section, 17 output section, 18 communication I / F, 19 I / F controller , 20 data conversion section, 31 spindle motor, 32 servo control section, 33 pickup section, 34 RF amplifier, 35 signal processing section, 36 memory controller, 37 memory, 38 I / F controller, 39 control section, 41 list acquisition section, 42 free area list storage section, 43 defect list storage section, 44 continuous free area list creation section, 45 continuous free area list storage section, 46 continuous free area detection section, 47 data setting section, 48 recording control section, 49 data storage section

Claims (16)

In a recording control device that performs control for recording data on a recording medium,
Continuous free area detection means for detecting a continuous free area that is a physically continuous free area of the recording medium,
A recording control unit for continuously recording data in the continuous free area. When there is a defective area in the continuous free area,
The continuous free area detecting means detects a continuous free area immediately after the defective area,
2. The recording control device according to claim 1, wherein the recording control unit records the data in a continuous free area immediately after the defective area. 3. The recording control apparatus according to claim 2, wherein said recording control means immediately records said data in a continuous free area immediately after said defective area. The continuous free space detecting means detects a continuous free space for the data immediately after the defective area,
The recording control means,
While securing a continuous free area for the data, storing the data,
3. The recording control device according to claim 2, wherein after the recording of the data to be recorded on the recording medium is completed, the stored data is recorded in the reserved continuous free area. When there is a defective area in the continuous free area,
The continuous free space detection means detects any other continuous free space of the recording medium,
2. The recording control apparatus according to claim 1, wherein the recording control unit records the data in the other arbitrary continuous free area. 6. The recording control apparatus according to claim 5, wherein the recording control means immediately records the data in another arbitrary continuous free area of the recording medium. The continuous free space detecting means detects a continuous free space for the data, other arbitrary, of the recording medium,
The recording control means,
While securing a continuous free area for the data, storing the data,
6. The recording control apparatus according to claim 5, wherein after the recording of the data to be recorded on the recording medium is completed, the stored data is recorded in the reserved continuous free area. 2. The recording control apparatus according to claim 1, wherein the continuous free area detecting means detects a continuous free area based on a continuous free area list in which the continuous free areas on the recording medium are described. 9. The recording control apparatus according to claim 8, further comprising a continuous free area list creating unit for creating the continuous free area list. The continuous free area list creating means creates the continuous free area list based on a free area list describing free areas on the recording medium and a defect list describing defective areas on the recording medium. The recording control device according to claim 9, wherein: 11. The recording control device according to claim 10, wherein the continuous empty area list creating unit acquires the empty area list and the defective area list from a recording device that records data on the recording medium. For the recording device, by specifying a logical position on the recording medium, data is recorded at a physical position of the recording medium assigned to the logical position,
The defect area list describes a physical position of the defect area,
In the case where the free area list describes the logical position of the free area,
The continuous free area list creating means,
From the defective area list, determine the logical position of the normal recording area immediately before the defective area as the end point position of the continuous free area,
The method according to claim 11, wherein in the free space list, a continuous logical position is divided into a part from the head to the end point position and the rest thereof, each of which is the continuous free area. The recording control device according to the above. For the recording device, by specifying a logical position on the recording medium, data is recorded at a physical position of the recording medium assigned to the logical position,
In the defective area list, the physical position of the defective area and the physical position of the replacement area of the defective area are described in association with each other,
In the case where the free area list describes the logical position of the free area,
The continuous free area list creating means,
From the defective area list, a logical position of the defective area is obtained as a division position of the continuous free area,
In the free space list, a continuous logical position is divided into a part from the beginning to a position immediately before the partition position and a part from the position immediately after the partition position to the end. The recording control device according to claim 11, wherein the recording control device is an area. The recording control device according to claim 1, wherein the recording medium is a disk-shaped recording medium. In a recording control method for performing control of recording data on a recording medium,
A continuous free area detection step of detecting a continuous free area that is a physically continuous free area of the recording medium,
A recording control step of recording data continuously in the continuous free area. In a program for causing a computer to perform recording control for performing control for recording data on a recording medium,
A continuous free area detection step of detecting a continuous free area that is a physically continuous free area of the recording medium,
A recording control step of recording data continuously in the continuous free area.

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