JP2005216431A - Information recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and reproducing device capable of reducing the occurrence frequency of buffer overrun by improving the utilizing efficiency of a buffer area. <P>SOLUTION: An optical disk recording device 10 which records information in which the minimum unit of information is made 1 sector and an error-correction code is added every block consisting of N sectors on a recording medium in a block unit is equipped with; a buffer 16 which holds information transferred from a host device at the time of recording the information; a buffer controller 26 which divides the information transferred from host device into information of a sector unit and information of a block unit to store the information in a write buffer 16a and also which is managed by a seek map 16b; and a recording signal processing circuit 24 which records the information held in the buffer 16a as information of the sector unit and the information of the block unit transferred from the host device on the recording medium. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to an apparatus for recording / reproducing information on / from a recording medium such as an optical disk.

  In recent years, optical discs such as CDs and DVDs have become widespread as information recording / reproducing media for computers and video equipment. In addition, next-generation high-density optical disc information recording media are being developed.

  The next-generation high-density optical disk is expected to be used as an information recording medium for so-called audio / video (AV) use and personal computer (PC) use, as with conventional DVDs. In the case of PC use, a so-called FAT system or UDF system is generally used as a file format, and user data is recorded based on these file formats.

  When information (hereinafter referred to as a file) is recorded on an optical disc recording medium (hereinafter referred to as a medium), a physical position (hereinafter referred to as a physical ID) on the medium corresponding to a logical ID designated by the HOST device for a file transferred from the HOST device is recorded. ) Is recorded. The file transferred from the HOST is continuous data on the logical ID, but the physical position on the medium may be discontinuous according to the physical structure of the recording medium and the defect management method.

  Further, when the HOST device performs an operation on the information recording / reproducing device so as to continuously record a plurality of files, the continuity of the logical IDs of the plurality of files may not be guaranteed.

  When a plurality of files are recorded on the medium and the physical positions on the medium are discontinuous, an optical disk recording / playback pickup head (hereinafter referred to as PUH) is placed on the medium corresponding to the logical ID of the file. The process of transferring to the physical position (hereinafter referred to as seek process) is performed a plurality of times.

  Regarding the seek of the optical disc recording / reproducing apparatus, the time required for at least one seek takes several msec to several hundreds msec in a general recording / reproducing apparatus. Here, the variation in seek time depends on, for example, the absolute distance of the seek and the performance difference of the device, but when performing a so-called random seek test, which is an index for evaluating the seek performance by specifying the absolute seek distance randomly. The average seek time is generally about 100 msec to 200 msec.

  Here, assuming that the HOST device performs an operation for continuously recording a plurality of files, it is necessary to perform seek processing a plurality of times. The logical ID designated by the HOST device is a physical ID on the medium. As a result, the seek time becomes redundant depending on the number of physical IDs that need to be seeked and the distance between the physical IDs.

As a method for dealing with this problem, a technique called a write cache is adopted for a conventional optical disc recording / reproducing apparatus. In this method, a file designated for writing by the HOST device is not immediately recorded on the medium, but is first held in the buffer area in the optical disc recording / reproducing device, and a recorded response is returned to the HOST device. By doing so, it is possible to receive designation of the next write file from the HOST device, and to accept a write request from the HOST device as long as the capacity of the buffer area is allowed. Then, for a plurality of files held in the buffer area when it is determined that the capacity of the buffer area is limited, the logical ID of each file is converted into a physical ID, and writing processing to the medium in the order of the physical ID is performed. The number of seeks and the distance are set to the minimum time.

  Such a technique called write cache is described in Japanese Patent Application Laid-Open No. 7-325442.

  By adopting the above write cache method, the waiting time of the HOST device is shortened. However, when the optical disc recording / reproducing device accepts write data up to the limit of the buffer, the write request from the HOST device is accepted thereafter. (Buffer overflow run) is not possible.

  In order to prevent buffer overrun, it is conceivable to increase the buffer capacity of the optical disk recording / reproducing apparatus. However, increasing the buffer capacity leads to an increase in cost. Even if the buffer capacity is increased, since the capacity is limited, the buffer overrun is more likely to occur as the transfer speed of the HOST device increases.

  In particular, in the case of a medium such as a DVD having a physical format in which an error correction code is added, that is, a minimum unit for writing to the medium is N sectors (usually 16 sectors, hereinafter referred to as ECC block units), it is designated by the HOST means. When performing write cache processing of a write file to be written, the area allocation of the buffer area is usually set to one ECC block unit which is the minimum unit of writing, and even for data less than one ECC block, the buffer area for one ECC block Will be reserved and data will be stored.

  For this reason, even when the total data size transferred as a write file from the HOST device is within the buffer capacity limit, the buffer capacity of the optical disc recording / reproducing apparatus is limited.

Therefore, it is desired to reduce the frequency of occurrence of buffer overflow by using the buffer efficiently.
JP 7-325442 A (6th page, FIG. 1)

  As described above, the present invention solves the problem of reduced use efficiency of the buffer area caused by the physical format of the recording medium, improves the use efficiency of the buffer area, and reduces the frequency of occurrence of buffer overruns. It is an object of the present invention to provide an information recording / reproducing apparatus that can be used.

  In order to solve the above problems, the present invention provides an information recording / reproducing apparatus for recording information on a recording medium in units of blocks in which an error correction code is added to each block of N sectors, with a minimum unit of information being one sector. A buffer for holding information transferred from the host device when recording the information; a management means for dividing and managing the information transferred from the host device into sector and block unit information; Means for recording on the medium the information transferred from the host device and held in the buffer as sector and block unit information.

According to the present invention, when the write cache process is executed, the area allocation unit of the buffer area is mixedly used in the sector unit and the ECC block unit, so that the buffer area usage efficiency is improved and the buffer overrun run is improved. An information recording / reproducing apparatus capable of reducing the occurrence frequency can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram for explaining the configuration of an optical disc recording / reproducing apparatus 10 to which the present invention is applied. The optical disc recording / reproducing apparatus 10 uses a laser beam to read data from an optical disc 11 such as a DVD-R or a DVD-RAM. A pickup head (PUH) 12 for writing, a drive motor 13 for rotating the optical disk 11, a feed motor 14 for moving the PUH 12 in the radial direction of the optical disk, and a digital signal for processing a reproduction signal and a recording signal from the PUH 12 A signal processor (DSP) 15, a buffer 16 that holds reproduction data and recording data, a control microcomputer 17 that controls the DSP 15, and a defect management information storage memory 18 that stores defect management information described later.

  The DSP 15 includes a PUH 12, a drive motor 13, a servo processing circuit 19 for servo-controlling the feed motor 14, a preamplifier / equalizer 20 for amplifying a reproduction signal obtained from the PUH 12, and a reproduction output from the preamplifier / equalizer 20. A reproduction signal processing circuit 21 that demodulates and outputs a signal, a physical address detection circuit 22 that detects a physical address of an optical disk reproduced by the PUH 12 based on reproduction data output from the reproduction signal processing circuit 21, a servo processing circuit 19, and A timing generation circuit 23 that outputs a timing signal to the physical address detection circuit 22 is provided. The DSP 15 also exchanges reproduction data / recording data with the recording signal processing circuit 24 that modulates and outputs recording data, the recording amplifier 25 that amplifies the signal output from the recording signal processing circuit 24, and the buffer 16. A buffer controller 26 for managing, an ECC decoder 27 for performing ECC decoding processing of reproduction data, an ECC encoder 28 for performing ECC encoding of recording data, and a host interface (HOST-I /) for exchanging data and commands with the host device 30 F) 29.

  FIG. 2 shows the optical disk 11, and defect management information recording areas 11 a and 11 b are provided on the inner side (lead-in area) and the outer side (lead-out area) of the information recording area 11 c of the optical disk 11. . In each defect management information recording area, Primary Defect List (PDL) management information and Secondary Defect List (SDL) management information are stored.

  FIG. 3 is a table showing the contents of the PDL management information and the SDL management information. The PDL management information is defective block information that is updated when a result detected at the time of initialization of the disk is registered. Contains detected defective block information. The SDL management information is the defect block information for registering the defective block detected at the time of actual use of the medium, that is, at the time of information recording / reproducing, and records information on the secondary defective block. In both tables, the table update date, the number of defective block entries, and the defective block entry number are recorded.

  The PDL information and the SDL information recorded in the defect management information recording areas 11 a and 11 b are read when the optical disk 11 is mounted on the optical disk recording / reproducing apparatus 10 and stored in the defect management information storage memory 18. When updating these PDL information and SDL information, the information is overwritten and updated in the defect management information recording area (11a, 11b) on the medium, and a plurality of PDL and SDL having the same contents are recorded. It enables recovery from fingerprints and scratches caused by external factors. In addition, there is a case of a media standard that allows PDL and SDL to be replaced, and in this case, replacement processing is executed.

  FIG. 4 is a diagram showing a concept when data of one ECC block is recorded on the optical disc 11, and a data block composed of a PI row and a PO column on the right side in the drawing is a 1 ECC block. The PI row is a data string of 182 bytes in total, to which 172 bytes of data and 10 bytes of inner code parity (PI) are added. This PI line is 12 lines of data for one sector of the optical disk, and 16 lines of outer code parity (PO) are added to the data of 16 sectors. Therefore, the PO sequence is a 208-byte data sequence composed of 192 (16 × 12) Byte data and 16-byte parity.

  When this ECC block data is recorded on the optical disc 11, 12 rows of PI rows and 1 outer code parity (PO) row are interleaved to form one sector unit data, which is recorded on the optical disc 11. Is done.

  FIG. 5 is a diagram showing a concept when data of one ECC block is read from the optical disc 11, and the data read from the optical disc 11 is deinterleaved to restore the ECC block in the reverse procedure described in FIG. Error correction based on the inner code parity (PI) and error correction based on the outer code parity (PO) are executed by the ECC decoder 27. As a result, the presence or absence of an error in the PI row and PO column unit is determined. As shown in FIG. 5, if the sector 1 is contaminated and correct reading is not performed and error correction is impossible, an error has occurred in the sector 1 Is determined.

  The recording data interleaving process and the reproduction data deinterleaving process described above are processed on the buffer 16.

  The optical disk recording / reproducing apparatus 10 records and reproduces information on the inserted optical disk 11 in accordance with a recording / reproducing command from the external HOST 30. First, a basic procedure related to information recording / reproducing will be described.

  As a procedure for reproducing information from the optical disk 11, first, an information reproduction request (command) is generated from the external HOST 30, the HOST I / F 29 receives the information reproduction request, and an information reproduction request is received from the external HOST to the control microcomputer 17. Notify that it has occurred. First, the control microcomputer 17 reserves the area length necessary for the reproduction process of the information reproduction data length in the buffer controller 26 based on the information reproduction data length of the information reproduction request.

  Thereafter, the control microcomputer 17 determines the data position requested for information reproduction based on the information logical address of the information reproduction request and the defect management information stored in the defect management information storage memory 18, and the absolute physical on the optical disk 11 is determined. An address indicating a position (hereinafter referred to as a physical address) is calculated, and the data requested for reproduction recording is recorded based on the information logical address of the information reproduction request and the defect management information stored in the defect management information storage memory 18. An address indicating the absolute physical position on the optical disk 11 (hereinafter referred to as a physical address) is calculated, and the servo processing circuit 19 is instructed to transfer the optical pickup 12 to the physical address position.

When the transfer of the optical pickup 12 by the servo processing circuit 19 is completed, the servo processing circuit 19 shifts to a so-called reproduction state and notifies the control microcomputer 17 of the end of the optical pickup transfer process. When the control microcomputer 17 receives the notification of the completion of the transfer of the optical pickup, the physical address detection circuit 22 refers to the physical address of the reproduction position from the output of the reproduction signal processing circuit 21 and records the data requested for reproduction on the optical disk 11 recorded. Then, an instruction to store the reproduction data from the physical address requested to be reproduced in the buffer 16 is issued. The reproduction signal processing circuit 21 operates the buffer controller 12 to transfer the requested reproduction data to the buffer 16. When the transfer is completed, the reproduction signal processing circuit 21 notifies the control microcomputer 17 of the transfer completion. The control microcomputer 17 issues to the ECC decoder circuit 27 an instruction to perform ECC decoder processing on the requested reproduction data. The ECC decoder circuit 27 operates the buffer controller 26 to transfer reproduction data from the buffer 16, and performs ECC decoder processing to perform error correction. When the error correction is completed, the ECC decoder circuit 27 notifies the control microcomputer 17 that the error correction is completed.

  Thereafter, the control microcomputer 17 issues a transfer command to the buffer controller 26 and the HOST-I / F 29I in order to transfer the reproduction data subjected to error correction to the external HOST. The buffer controller 26 and the HOST-I / F 29 execute a process of transferring the data in the transfer range instructed by the control microcomputer 17 to the external HOST 30. When transfer of the reproduction data to the external HOST 30 is completed, the HOST-I / F29 notifies the control microcomputer 17 of the end of transfer.

  On the other hand, as a procedure for recording information on the optical disk 11, first, an information recording request (command) is generated from the external HOST 30, and the HOST-I / F 29 receives the information recording request from the external HOST 30 to the control microcomputer 17. Notify that an information recording request has occurred. First, the control microcomputer 17 reserves the area length necessary for the recording process of the information recording data length to the buffer controller 26 based on the information recording data length of the information recording request. Then, the control microcomputer 17 instructs the HOST-I / F 29 to acquire the recording data requested to be recorded from the external HOST 30.

  The HOST-I / F 29 acquires the recording data requested to be recorded from the HOST 30, operates the buffer controller 26 to transfer the data to the buffer 16, and notifies the control microcomputer 17 when the recording data has been transferred to the buffer 16. After receiving the notification of completion of transfer of the recording data to the buffer 16, the control microcomputer 17 instructs the ECC encoder circuit 28 to ECC encode the recording data transferred to the buffer. The ECC encoder circuit 28 notifies the control microcomputer 17 of the end of the ECC encoding process after the ECC encoding process is completed.

  Thereafter, the control microcomputer 17 uses the information requesting information logical address and the defect management information stored in the defect management information storage memory 18 to record the absolute physical data on the optical disk 11 on which the information recording requested data is to be recorded. An address indicating the position (hereinafter referred to as a physical address) is calculated, and the servo processing circuit 19 is instructed to transfer the PUH 12 to the physical address. When the PUH 12 transfer processing by the servo processing circuit 19 is completed, the servo processing circuit 19 shifts to a so-called reproduction state and notifies the control microcomputer 17 of the end of the PUH 12 transfer processing. When the control microcomputer 17 receives the transfer completion notification of the optical pickup, the physical address detection circuit 22 refers to the physical address of the reproduction position from the output of the recording signal processing circuit 24 and records the data requested for recording. The command to record the recording request data (ECC encoded processing) stored in the buffer 16 is output from the recording target physical address 11.

  The recording signal processing circuit 24 acquires recording request data that has been subjected to ECC encoding processing of the buffer 16 via the buffer controller 26 in synchronization with the physical address value detected by the physical address detection circuit 22 and the physical address detection synchronization signal. Then, it is transmitted to the PUH 12 via the recording amplifier 25 and recorded on the optical disk 11. When the recording signal processing circuit 24 finishes recording all the data requested to be recorded, it notifies the control microcomputer 17 that the recording is completed.

The control microcomputer 17 records the recording request data on the optical disk 11 based on the information logical address of the recording request and the defect management information stored in the defect management information storage memory 18.
The servo processing circuit 19 is instructed to transfer the PUH 12 to an address (hereinafter referred to as a physical address) indicating an absolute physical position on the recording medium. When the optical pickup transfer of the PUH 12 by the servo processing circuit 19 is completed, the servo processing circuit 19 shifts to a so-called reproduction state, and notifies the control microcomputer 17 of the completion of the optical pickup transfer process of the PUH 12.

  When the control microcomputer 17 receives the transfer completion notification of the optical pickup, the physical address detection circuit 22 refers to the physical address of the reproduction position from the output of the reproduction signal processing circuit 21, and the information recording request data is recorded. An instruction to store the reproduction data from the physical address of the optical disk 11 in the buffer 16 is output. The reproduction signal processing circuit 21 operates the buffer controller 26 to transfer reproduction data to the buffer 16. When the transfer is completed, the reproduction signal processing circuit 21 notifies the control microcomputer 17 of the completion of the transfer.

  In response to the notification of the transfer end, the control microcomputer 17 issues an instruction to the ECC decoder circuit 27 for performing ECC decoding processing on the reproduction data obtained by reproducing the information recording request data. The ECC decoder circuit 27 operates the buffer controller 26 to transfer the reproduction data obtained by reproducing the recording data from the buffer 16, and performs an ECC decoding process to perform error correction.

  Here, when the error correction is completed, the recording process of the requested data is successful. However, external factors such as fingerprint stains and scratches due to carelessness of the operator are attached to the optical disk 11. In some cases, error correction is impossible. In this case, ECC blocks that cannot be corrected for errors are registered in the defect management information, and replacement processing of ECC blocks that cannot be corrected for errors is performed.

  The defect management information is stored in the buffer memory 16 in a state of being reproduced from the medium in advance. There are two types of PDL (Primary Defect List) and SDL (Secondary Defect List), which are defective block information stored on the medium. The defect management information overwrite recording method is the same as the normal recording operation described above, but the recording data is not acquired from the HOST 30, but the updated defect management information on the buffer memory 16 is acquired to be the recording data. .

  The basic procedure for recording / reproducing information in the optical disc recording / reproducing apparatus 10 is as described above. Details of the write cache buffer management according to the present invention will be described below.

  FIG. 6 is a diagram for explaining the mapping of the buffer 16. The buffer area of the buffer 16 is roughly divided into an apparatus work area and a recording / reproducing information processing area. The apparatus work area is allocated as the information processing temporary area 1 of the microcomputer and other controllers in the recording / reproducing apparatus, but a part of the table area for storing the proposed write cache processing table (hereinafter referred to as seek map). It is assigned as.

  The seek map is information shared by the microcomputer 17 and the buffer controller 26 for system control, and is used for determining the processing order of write processing and verification processing of write cached data based on this seek map and storing the processing status. .

The recording / reproducing information processing area is an area used for information recording / reproducing, a defect management information area of the medium, a buffer area dedicated to read processing, a merge area for merging read data or zero data and sector unit write data, and a write The buffer area is allocated. The write buffer area can be allocated in units of n sectors or 1 ECC block. The relationship between the recording position on the medium and the information storage position on the buffer is managed by storing the mapped information size, write buffer position, and physical ID position information in the seek map. Therefore, as shown in the figure, the MAP No, logical ID, physical ID, buffer address, area attribute, size, merge attribute, verification processing result, etc. are recorded in the seek map.

  Next, details of a procedure for recording information using the mapping of the buffer 16 described with reference to FIG. 6 will be described with reference to FIGS.

  FIG. 7 is a flowchart for explaining the procedure for recording information. The HOST-I / F 29 checks whether an information recording request has been received from the host device 30. The external HOST 30 notifies that an information recording request (write command) has occurred (ST1).

  Upon receiving the information recording request occurrence notification, the control microcomputer 17 reserves the area length necessary for the recording process of the information recording data length in the buffer controller 26 based on the information recording data length of the information recording request (ST2).

  FIG. 8 is an explanatory diagram of the processing for receiving and writing to the HOST command. As shown in the figure, the write command is issued from the HOST 30 in the order of the first command, the second command, and the third command. Is shown. When receiving the first HOST command, the optical disc recording / reproducing apparatus 10 converts the relationship between the physical ID recorded on the medium and the sector length from the relationship between the logical ID of the information recording destination and the sector length (hereinafter, logical ID-physical ID). Conversion process) is performed (ST3). After performing the logical ID-physical ID conversion process, the control microcomputer 17 determines whether the area of the corresponding physical ID is a defect area based on the defect management information stored in the defect management information storage memory 18. (ST4) If the area of the corresponding physical ID is a defective area, a replacement process is performed to set a non-defective area (ST5).

  Thereafter, the control microcomputer 17 determines the mapping on the write buffer in units of n sectors (1 ≦ n ≦ 15) and 1 ECC block (ST6), acquires information to be recorded from the HOST device 30 and follows the determined mapping. The recording data is stored in the write buffer (ST7). In the example of FIG. 8, in the example of the first command, the recording information for 37 sectors is acquired from the HOST device 30, and this is divided into 3 sector data, 2 16 sector data, and 2 sector data. Hold in the buffer.

  Then, the control microcomputer 17 stores information such as MAP No, logical ID, physical ID, buffer address, area attribute, size, etc. on the seek map (ST8), and notifies the HOST device of the end of processing (ST9). ).

  Whether or not the capacity of the write buffer of the buffer 16 has reached the limit is determined by the control microcomputer 17, and if the capacity of the write buffer has not reached the limit, an information recording request (write command) can be accepted and the above steps are performed. Return to 1 (ST1).

  As shown in FIG. 8, when the HOST device 30 issues the second and third write commands, the optical disc recording / reproducing device 10 performs the same processing for the second and third write commands. In the third write command example, when the logical ID-physical ID conversion process is performed, the control microcomputer 17 determines that the corresponding physical ID area is a defective area based on the defect management information stored in the defect management information storage memory 18. Since it has been found that this is the case, replacement processing is performed.

The mapping of the write buffer when the first to third commands shown in FIG. 8 are received from the HOST device 30 and write cached is as shown in FIG. 9, and the write buffer is in n sector units (1 ≦ n ≦ 15). Mapping of 1 ECC block unit is mixed. The size of the mapped information, the write buffer position, and the physical ID position information are stored in a seek map as shown in FIG. 10, and the relationship between the recording position on the medium and the information storage position on the buffer is managed. The

  Returning to the flowchart of FIG. 7, when the control microcomputer 17 determines that the write buffer capacity of the buffer 16 has reached the limit in step 10 (ST10), the data held in the write buffer is transferred to the optical disc 11. The recording process is started.

  FIG. 11 is a diagram for explaining the write-cached data recording process and the verify process of the present proposal. This is an example in which the write verify process is performed for the write cache in the process of the processing of the three HOST commands shown in FIG. First, a seek map (b) is obtained by sorting the created seek map (a) in FIG. 11 in ascending physical ID order (ST11).

  Next, the control microcomputer 17 sends the MAP No. of the seek map (b) to the ECC encoder circuit 28. The ECC encoder circuit 28 executes ECC encoding processing by commanding ECC encoding of one recording data. Here, when the data to be ECC-encoded is in units of 1 ECC block, it is ECC-encoded on the write buffer, and in the case of data in units of n sectors (1 ≦ n ≦ 15), the merge area is used. ECC encoding processing is performed (ST12). In the case of data in units of n sectors (1 ≦ n ≦ 15), the data is less than one ECC block, so padding processing is performed or data for one ECC block is merged with data recorded on the optical disc 11 After that, ECC encoding processing is performed.

  Thereafter, the control microcomputer 17 instructs the servo processing circuit 19 to transfer the PUH 12 to the absolute physical position (physical address) of the data to be recorded on the optical disk 11, and the servo processing circuit 19 sets the PUH 12. A transfer process is executed (ST13).

  The physical address detection circuit 22 refers to the physical address of the reproduction position from the output of the recording signal processing circuit 24, and the recording signal processing circuit 24 detects the physical address value detected by the physical address detection circuit 22 and the physical address detection synchronization signal. In synchronization with the recording request data, the ECC-encoded recording request data in the buffer 16 is transmitted to the PUH 12 via the buffer amplifier 26 and recorded on the optical disk 11 via the recording amplifier 25 (ST14).

  When the recording ends, the recording signal processing circuit 24 notifies the control microcomputer 17 that the recording has ended, and the control microcomputer 17 again executes the process of transferring the PUH 12 to the head physical position of the recorded data (ST15). Then, recording verification is performed by reading out the recording data and performing ECC decoding (ST16). The result of the recording verify process is recorded in the seek map as to whether the write process is normally completed or verified NG, and the seek map (c) of FIG. 11 is obtained.

  The result of the ECC recording verify process is confirmed by the control microcomputer 17 (ST17), and in the case of verify NG (that is, when a new defective block is detected), a replacement process is performed (ST18). In this case, it is possible to perform the write process continuously by adding a seek map for the block to be replaced to the seek map (c) and sorting the seek MAP again.

In the case of verify OK in step 16 and after execution of the replacement process, the control microcomputer 17 determines whether or not the recording of all the recording data held in the buffer area has been completed according to the check column of the seek map (c) in FIG. If it is determined (ST19) and all the recordings are completed, the process returns to step 1 to wait for the next command.

  In the case of the example shown in FIG. 11, the MAP No. of seek map (c). 1 to MAP No. 3 is determined to be sufficiently close to the physical ID. First, the recording process is continuously performed, the seek is performed, and the MAP No. of the seek map is determined. 1 to No. 3 is continuously verified, and the result of the verification is stored in the seek map. Next, MAP No. 4 and MAP No. In the case of No. 5, seek is performed in the same manner, and continuous recording and continuous verification are performed. In the same manner, MAP No. 6 was recorded and verified, followed by MAP No. 7 and MAP No. MAP No. 8 that is sufficiently close to the physical ID, such as performing a record verify for 8. It is possible to reduce the frequency of seek occurrence by collectively processing the information. The seek map sorting need not be in ascending order of physical IDs, may be in absolute position order of medium radius positions, and is not particularly limited in ascending order / descending order.

  FIG. 12 is a diagram for explaining another example of write buffer mapping in the write cache processing of the present invention. When mapping of n sector units (1 ≦ n ≦ 15) and 1 ECC block unit of the write buffer coexists, a gap may occur at the boundary between the sector region and the block region, and the use efficiency of the write buffer may be reduced. Therefore, in the example of FIG. 12, it is possible to reduce the gap between the sector area and the block area by arranging the sector area and the block area in ascending or descending order.

  When the write buffer mapping shown in FIG. 12 is adopted, the seek map is as shown in FIG. The basic structure of the seek map is the same as in FIG. 9, but the sector area and block area are arranged in ascending or descending order, so the address of the write buffer is different from that in FIG. .

  As described above, in the present embodiment, when the write cache method is executed, a write method with a limited capacity can be realized by adopting a method that can mix the sector allocation unit of the buffer area with the sector unit and the ECC block unit. Use efficiency of the buffer area is improved and management operation is facilitated. As a result, it is possible to provide an information recording / reproducing apparatus that can reduce the frequency of occurrence of buffer overflow runs.

1 is a block diagram for showing the configuration of an optical disc recording / reproducing apparatus according to the present invention. The figure explaining arrangement | positioning of the defect area | region of an information recording medium. It is explanatory drawing of the defect management information memorize | stored in the defect area | region. The figure explaining the ECC encoding process of recording information. The figure explaining ECC decoding processing of reproduction information. The figure explaining the mapping of the buffer in an information recording / reproducing apparatus. 10 is a flowchart for explaining a procedure for recording information in a write cache process. The figure for demonstrating the process after HOST command reception. The figure explaining the write buffer mapping at the time of performing a write cache process. The figure explaining the seek map at the time of mapping of FIG. Explanatory drawing of seek map during data recording and verification processing The figure explaining the other example of write buffer mapping. The figure explaining the seek map at the time of mapping of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Optical disk recording / reproducing apparatus 11 ... Optical disk 16 ... Buffer 16a ... Write buffer 16b ... Seek map 17 ... Control microcomputer 26 ... Buffer controller

Claims (5)

In an information recording / reproducing apparatus for recording information on a recording medium in a block unit in which an error correction code is added to each block consisting of N sectors, with a minimum unit of information being one sector,
A buffer for holding information transferred from a host device when recording the information;
Management means for dividing and managing information transferred from the host device into information in sectors and blocks;
An information recording / reproducing apparatus comprising: means for recording on the medium information transferred from a host device and held in a buffer as sector and block unit information. The management means has a management table for managing a buffer area for temporarily storing recording information transferred from the host device in units of sectors and blocks, and the physical position of the recording medium is determined by the management table. The information recording / reproducing apparatus according to claim 1, wherein a search order is managed. In an information recording / reproducing method for recording information on a recording medium in a block unit in which an error correction code is added to each block composed of N sectors, the minimum unit of information being one sector,
A management step for dividing and managing the information transferred from the host device when holding the information transferred from the host device when recording the information in a buffer;
An information recording / reproducing apparatus comprising: step means for recording information transferred from a host apparatus and held in a buffer as sector and block unit information on the medium. The management step includes a step of creating a management table for managing a buffer area for temporarily storing recording information transferred from the host device in units of sectors and blocks;
The information recording / reproducing apparatus according to claim 3, further comprising a step of determining a search order of physical positions of the recording medium based on the management table. In an information recording / reproducing apparatus for recording information on a recording medium in a block unit in which an error correction code is added to each block consisting of N sectors, with a minimum unit of information being one sector,
A buffer for holding information transferred from a host device when recording the information;
A buffer controller that divides and manages information transferred from the host device into sector and block unit information;
An information recording / reproducing apparatus comprising: means for recording on the medium information transferred from a host device and held in a buffer as sector and block unit information.

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