Classifications

• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
  • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
  • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
  • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
  • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
  • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
  • G11B27/327—Table of contents
  • G11B27/329—Table of contents on a disc [VTOC]
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
  • G11B2220/215—Recordable discs
  • G11B2220/218—Write-once discs
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
  • G11B2220/2537—Optical discs

Definitions

• the present invention relates to a data recording apparatus and data recording method for recording data on a recording medium, and a computer program, and can be recorded only once, for example, DVD_R, DVD + R, CD-R.
• the present invention relates to a data recording apparatus and a data recording method for additionally recording data on a simple optical disc, and a computer program.
• the present invention relates to data recording in which data is appended to a recording medium multiple times in a format conforming to UDF (Universal Disk Format) (registered trademark) prescribed by ⁇ STA ( ⁇ ptical Storage Technology Association).
• Apparatus, data recording method, and computer 'In particular, it relates to a program, in particular, a data recording device, a data recording method, and a computer that perform additional recording multiple times on a write-once recording medium in a state that can be reproduced by a reproduction-only device Regarding the program.
• Disc-type recording media (hereinafter referred to as "optical discs") that apply optical reading such as DVD (Digital Versatile Disk) and CD (Compact Disk) are used to store computer files and video streams. As an application, it is rapidly spreading.
• the optical disk has a large storage capacity and can be accessed randomly.
• unlike contact-type magnetic recording media there is no concern about wear or damage to the recording surface or head crashes due to reading.
• the disk surface is sturdy and has a low risk of accidental data loss.
• recording and playback devices using write-once optical discs such as DVD-R, DVD + R, and CD-R have also been developed and manufactured. For example, they are used as external recording media for computers and external storage devices. I'm going.
• UDF Universal Disk Format
• OSTA Optical Storage Technology Association
• UDF is an ECMA (European Computer Manufacturer Association) — 16 7 (For example, see Non-Patent Document 2)
• ISO / IEC 13346 is an ISO9660 compatible with the increase in disk capacity and the number of files. Successor).
• ISO / IEC 13346 is an ISO9660 compatible with the increase in disk capacity and the number of files. Successor).
• UDF by adopting a packet writing method, processing such as addition or deletion of a file to an optical disc can be performed through a normal file system.
• the packet writing method here refers to a packet structure in which a user 'data' link link block and four Run-In areas are provided, and two Run-Out areas are provided at the end of the user 'data. Is to do.
• 7 blocks are used as a Linking Area that is a joint area between adjacent packets.
• UDF is a file system that is writable by almost any operating system (OS), and that the written file can be played back on the OS without a special reading program.
• OS operating system
• VAT is the logical address where the file is actually recorded and this logical address. It is an additional data structure on the disk that consists of a table that manages the virtual addresses corresponding to memory. When a file or other data on the disk is changed, the logical address can be rearranged using VAT, and the media on which sequential writing is performed is treated as if it was a random read / write media. Can do.
• the VAT position is a force that can be freely arranged in the packet structure S, and the VAT ICB (Information Control Block) pointing to the VAT returns the last sector force of the recorded area by the link area It is decided that it must be placed in each sector.
• the VAT ICB Information Control Block
• past recorded data remaining on the recording medium can be referred to by reading VAT other than VAT recorded at the end of the recorded area of the recording medium.
• a data recording / reproducing apparatus has been proposed that reads VAT recorded on a recording medium and appends it to the end of the recorded area of the recording medium (see, for example, Patent Document 1). According to this device, it is possible to refer to the past recorded data remaining on the recording medium by reading the force VAT other than the last end of the recorded area at the time of reproduction.
• the recording media additionally recorded according to the UDF is not yet subjected to special processing such as finalization, that is, still in a state where it can be additionally recorded.
• playback can be performed even on a playback-only device. For example, taking a still image or moving image recorded on a DVD shot with a digital camera, loading it into a DVD player, displaying the image, loading it into the digital camera again, and recording the shot image. It is.
• the disk recording device ensures compatibility with these existing disk read-only devices. I can't do it. For example, there is a report from a user that a video DVD burned on a personal 'computer could not be played on a set-top DVD player. The power and cause also depend on whether the UDF format supported by each device supports VAT. In the future, it is possible to install VAT in a dedicated disk playback device that will be on the market, but there is a problem that the device cost will increase.
• Patent Document 1 Japanese Patent Laid-Open No. 2001-351336
• Non-Patent Document 2 h tp: Z www.ecma—international, org / publications / standards / Ecma—167.htm
• An object of the present invention is to provide an excellent data recording apparatus and data capable of suitably recording data on a write once (recordable only once) optical disk such as DVD_R, DVD + R, and CD-R. To provide a recording method as well as a computer 'program.
• a further object of the present invention is to provide an excellent data recording apparatus, data recording method, and computer capable of suitably performing additional recording operation on a recording medium in a format conforming to UDF defined by OSTA. To provide a program.
• a further object of the present invention is to provide an excellent data recording apparatus, data recording method, and computer capable of performing additional recording a plurality of times on a write-once recording medium in a state where it can be reproduced by a reproduction-only apparatus. 'To provide a program.
• a further object of the present invention is to provide a Virtual Allocation Table and Virtual Partition.
• the present invention has been made in consideration of the above problems, and a first aspect of the present invention performs additional recording on a disk composed of a plurality of logical sectors according to a predetermined file system 'format.
• a data recording device wherein, in the predetermined file system 'format, the first logical sector on the inner circumference side of the disk and the second and third logical sectors on the inner circumference side from the last logical sector on which recording has been completed.
• At least 2 of the 3 Record the reference information for the data
• Disk initialization means for reserving the area up to immediately before and initializing the disk
• the fourth logical sector immediately after the reserved area (if the disc has no file data recorded immediately after initialization), or the logical sector immediately after the recorded area
• the reference information for the file system 'data is recorded in the 2nd and 3rd logical sectors on the inner circumference side from the last recorded logical sector. Additional recording means to
• a data recording apparatus comprising:
• the present invention relates to a data recording apparatus that performs additional recording of data on a recording medium such as an optical disc a plurality of times based on, for example, a file system conforming to UDF defined by OSTA.
• VAT Virtual Allocation Table
• the recording media additionally recorded according to the UDF is not yet subjected to special processing such as finalization, that is, still in a state where it can be additionally recorded.
• finalization processing
• playback can be performed even on a playback-only device.
• AVDP chor Volume Descriptor Pointer
• VDS Vortex Volume Descriptor Pointer
• N and N the last logical sector number that have been recorded are 256 sectors before. It is agreed to record AVDP in at least two of the three logical sector numbers.
• AVDP is recorded in two locations of the logical sector number just 256 sectors before the last logical sector number N and N in each packet structure. Additional records can be made.
• VDS information is finalized when AVDP is recorded in the 256th logical sector makes it impossible to perform additional recording on the disc in a format that conforms to UDF.
• the data recording apparatus reserves an area including the 256th logical sector at the time of disc initialization processing, thereby writing the final AVDP in the 256th logical sector.
• the data can be recorded from this reserved area onwards.
• the reserved area remains in the reserved state until it is explicitly instructed by special processing such as finalization.
• packet writing is started from the logical sector immediately after the recorded area (including the reserved area).
• user data is written from the inner logical sector toward the outer periphery, and then the file system data is written immediately after that without leaving an unrecorded area.
• the file system data includes a VDS (Volume Descriptor Sequence) which is a descriptor describing information on the contents of the volume structure, and this VDS is indicated by AVDP.
• VDS Volume Descriptor Sequence
• UDF in the packet structure, the VDS is allowed to be placed freely. Restrictions / requirements are imposed on the position of AVDP.
• the AVDP when performing additional recording on the disc, the AVDP is recorded in two locations of the last logical sector number N of the recorded area and the logical sector number before 256 sectors from N, and thereafter the UDF conforms to the UDF. Added additional recording in different formats.
• AVDP is recorded in the 256th logical sector which is the reserved area, and the reserved area surplus is recorded.
• the AVDP can eventually be recorded in the 256th logical sector, which is less susceptible to damage.
• a computer is configured to execute a process for performing additional recording on a disk composed of a plurality of logical sectors in accordance with a predetermined file system 'format.
• a computer 'program written in a readable format and in the predetermined file system' format, the first logical sector on the inner circumference side of the disk and the second and inner logical sectors from the last recorded logical sector are recorded. It is decided to record reference information for the file system 'data in at least two of the three locations of the third logical sector.
• the innermost peripheral force of the disk The standard logical is recorded at a predetermined logical sector position, and the fourth logical sector that becomes the file / data recording start position immediately after the recording of the standard information is completed. Disk initialization procedure to reserve the area up to immediately before and initialize the disk,
• the fourth logical sector immediately after the reserved area (if the disc has no file data recorded immediately after initialization), or the logical sector immediately after the recorded area
• the file 'data and file system data are recorded in the file, and the reference information for the file system' data is recorded in the 2nd and 3rd logical sectors on the inner circumference side from the last recorded logical sector. Additional recording steps to
• the dummy data is padded from the inner circumference side of the reserved area to immediately before the first logical sector, and the reference to the last recorded file system data is made Finalizing processing procedure for starting the recording of information from the first logical sector and padding the area from immediately after the recording of the reference information to immediately before the fourth logical sector with dummy data;
• the computer 'program according to the second aspect of the present invention defines a computer' program described in a computer-readable format so as to realize predetermined processing on the computer.
• the computer 'program according to the second aspect of the present invention Is installed on a computer, a cooperative action is exhibited on the computer, and the same action and effect as those of the data recording apparatus according to the first aspect of the present invention can be obtained.
• an excellent data recording apparatus, data recording method, and computer that can suitably perform the additional recording operation of data on a recording medium in a format conforming to UDF specified by OSTA.
• a program can be provided.
• a program can be provided.
• the data recording apparatus performs additional recording on the recording medium without using the Virtual Allocation Table and Virtual Partition Map, the recording medium on which the additional recording has been performed can always be reproduced by the reproduction-only apparatus. Can keep the state.
• an area including the 256th logical sector is reserved at the time of initialization, and additional recording is performed by packet writing from this reserved area onward.
• additional recording can be made in a format that conforms to UDF.
• AVDP is recorded in the 256th logical sector, which is a reserved area, ensuring wide compatibility with playback-only devices. can do.
• FIG. 1 is a diagram schematically showing a hardware configuration of a digital camera 10 according to an embodiment of the present invention.
• FIG. 2 is a diagram showing an internal hardware configuration of the recording unit 4.
• FIG. 3 is a diagram showing a data 'layout immediately after the initialization process is performed on the optical disc.
• FIG. 4 is a flowchart showing a processing procedure for formatting an optical disc.
• FIG. 5 is a diagram showing the data 'layout after one additional recording is performed on the optical disc that has been initialized with the data' layout shown in FIG.
• FIG. 6 is a diagram showing the data layout after one additional recording is performed on the optical disc after the one additional recording shown in FIG. 5 is performed.
• FIG. 7 is a diagram showing a data layout after finalizing the optical disk shown in FIG. 6.
• FIG. 8 is a flowchart showing a processing procedure performed when a new disc is loaded in the recording unit 4.
• FIG. 9 is a diagram showing a procedure for determining whether or not to allow additional recording on a disc when the disc is formatted as shown in FIG.
• FIG. 10 is a flowchart showing a processing procedure for recording user data on a formatted disc.
• FIG. 11 is a flowchart showing a processing procedure for finalizing a disc.
• the data recording apparatus is based on a file system conforming to UDF specified by OSTA, and data is recorded on a recording medium such as an optical disk that can be recorded only once such as DVD-R, DVD + R, and CD-R. Is recorded multiple times.
• a recording medium such as an optical disk that can be recorded only once such as DVD-R, DVD + R, and CD-R. Is recorded multiple times.
• One typical example of the device configuration is a digital camera that digitizes an image captured by a solid-state image sensor.
• FIG. 1 schematically shows a hardware configuration of the digital camera 10 according to an embodiment of the present invention.
• a camera's block 1 that captures a subject includes a lens that captures the subject image, a CCD (Charge Coupled Device) or CMOS (Complementary Mental Oxide) that generates an electrical image signal by photoelectric conversion according to the amount of input light.
• Solid-state imaging devices such as Semiconductor
• a / D converters that digitally convert image signals
• demosaic processing units that calculate RGB signals from digital image signals (not shown).
• the image signal arithmetic processing unit 2 performs color reference form conversion from RGB signals to color differences and luminance signals, and encoding / compression processing to JPEG and MPEG formats.
• the image signal calculation processing unit 2 supplies the processed image signal to a display unit 7 constituted by a liquid crystal display (LCD) or the like, and outputs an image.
• LCD liquid crystal display
• the recording unit 4 converts the image file encoded and compressed by the image signal arithmetic processing unit 2 into a data Receive it via buffer 3 and record it on the currently loaded recording medium 4-1.
• the ability to additionally record data on the recording medium 41 multiple times based on a file system conforming to the UDF specified by OSTA will be described later in detail.
• the central processing unit 5 is provided by ⁇ S while loading the execution program to the temporary storage medium 6 composed of RAM (Random Access Memory) and temporarily storing system variables and environment variables.
• the overall processing operation of the digital camera 10 is comprehensively controlled by executing the program under the execution environment.
• the processing operations referred to here include camera image capture in the camera 'Block 1 and the accompanying auto' focus function, automatic exposure, camera shake correction, auto 'shutter' camera work, and recording unit 4 recording media 4 _ 1 For example, data recording.
• FIG. 2 shows an internal hardware configuration of the recording unit 4.
• the OP (Optical Pickup) unit 13 includes an objective lens, a laser diode (LD), a laser diode dry LD (LDdrv), a photo detect IC (Photo Detect IC), a half mirror, and the like.
• LD laser diode
• LDdrv laser diode dry LD
• Photo detect IC Photo Detect IC
• a half mirror and the like.
• an optical disc is used based on the laser blinking / driving signal (DECEFM W) from the signal processing unit 17 necessary for pit formation, the write strategy signal (WriteStrategy) indicating the optimum value of the laser intensity and blinking, etc.
• Write strategy is a technology that corrects the laser pulse during writing in the time and level directions for each pit so that the pit size after writing meets the
• the RF processing unit 14 is composed of the beam detected from the ⁇ P unit 13, the signal, the side, and the main.
• Eight signals are sampled and held and processed, and the FE (Focus Error), TE (Tracking Error), MIRR (Mirror), ATIP (Absolute Time In Pregroove) ), A signal such as a read main signal is generated.
• the RF processing unit 14 outputs FMDT (frequency modulation data), FMCK (frequency modulation clock), TE, and FE to the servo signal processing unit 15, and detects the laser intensity detected by trial writing.
• Optimal value ( ⁇ PC: Optical Power Calibration) signal and laser flashing ' Drive signal DECEFM is output to signal processor 17 and MIRR is output to central processor 5
• the servo signal processing unit 15 When the FMDT, FMCK :, TE, and FE from the RF processing unit 14 are input, the servo signal processing unit 15 generates various servo control signals peculiar to the optical disc in accordance with instructions from the central processing unit 5, and generates analog signals. 'Output to the filter processing unit 16.
• Analog 'The filter processing unit 16 generates an analog signal based on various servo control signals from the servo signal processing unit 15, and generates a spindle' driver 18, a thread 'driver 19, a tracking' driver 20, and a focus' Output to driver 21.
• the signal processing unit 17 inputs OPC and DECE FM from the RF processing unit 14, and performs CIRC (Cross Interleave Reed-Solomon Code) decoding and encoding, write strategy, ADDr Decode, asymmetry, running ⁇ Perform PC processing.
• CIRC Cross Interleave Reed-Solomon Code
• the spindle driver 18 controls the rotation of the spindle motor 22 based on the signal from the analog filter processing unit 16.
• the thread 'driver 19 controls the thread operation of the thread' motor 23 based on the signal from the analog filter processing unit 16.
• the tracking 'driver 20 swings the OP unit 13 based on the signal from the analog' filter processing unit 16 to control the position of the beam spot irradiated on the recording surface of the optical disc 25.
• the focus' driver 21 controls the laser focus adjustment by moving the OP section 13 in the direction perpendicular to the recording surface of the optical disk 25 based on the signal from the analog filter processing section 16.
• the spindle 'motor 22 rotates the optical disk 25 based on a signal from the spinneret driver 18.
• the thread 'motor 23 performs the thread operation of the OP unit 13 based on the signal from the thread' driver 19.
• the central processing unit 5 uses the temporary storage medium 6 as a work memory (described above). For example, a file related to a UDF file system that is updated each time a file or directory is updated, added, or deleted. System 'data is stored until just before the main power of the device 1 is turned off.
• the laser diode light reflected from the recording surface is read by the lens optical system of the OP section 13.
• the light from the lens optical system is converted into an electrical signal by the PDIC, sampled and held in the RF processing unit 14, and signals such as FE, TE, MIRR, ATIP, and readout main signal are calculated from each of the 8 predetermined signals. Generated by processing.
• the FE obtained by the RF processing unit 14 is adjusted in characteristics by the servo signal processing unit 15 and then input to the focus 'driver 21 through the analog' filter processing unit 16.
• the focus 'driver 21 moves the lens drive focus' coil (not shown) on the part P 13 upward and downward to correct the focus shift.
• the TE obtained by the RF processing unit 14 extracts the AC component by the servo signal processing unit 15 and performs digital 'filter processing, and then passes through the analog' filter processing unit 16 to track. Input to driver 20. Tracking 'Driver 20 finely moves the lens drive tracking coil of part 13 in the radial direction to correct the tracking deviation.
• the TE obtained by the RF processing unit 14 takes out the DC component by the servo signal processing unit 15 and performs digital 'filter processing, and then passes through the analog' filter processing unit 16 to obtain a thread ' Input to driver 19.
• the thread 'driver 19 operates the thread' motor, moves the entire OP section 13 in the radial direction of the recording medium, and corrects the deviation of the thread operation.
• the thread motor is forcibly driven by intentionally applying this thread control voltage from the outside.
• the detection signal (mirror) of the change in reflectance of the recording medium output from the RF processing unit 14 is detected when the OP unit 13 crosses the track, the current seek position is obtained by counting the mirror. The reading position is detected and the optical pickup operation is started and stopped.
• the spindle motor 22 is controlled based on ATIP processing.
• Time information is recorded in the meandering groove called Wobble groove written on the optical disc 25 by FM modulation of + / _ lKHz with a center frequency of 20.05 KHz in the radial direction.
• the What is modulated is time information called Bi-Phase modulated ATIP.
• the RF processing unit 14 extracts a wobble signal from a predetermined combination of the eight input signals. FM demodulation and ATIP decoding are performed and extracted as FMCK and FMDT.
• the FMDT is stored in a predetermined register classified as an absolute time position of the optical disk 25 by the servo signal processing unit 15, that is, an address and other additional information, and data is read out accordingly.
• a signal corresponding to the recording pit is extracted from a predetermined combination of 8 signals, equalized, and then supplied to the signal processing unit 17 in the form of an EFM (Eight to Fourteen Moduration) signal. Is done.
• the signal processing unit 17 can obtain desired data by performing decoding based on CIRC.
• the pick-up is moved to the lead-in area to read ATIP information.
• the special information section is read from it, and the start position of the lead-in area is known.
• the starting position is usually stored as time information.
• the information written in the special 'information corresponds to the individual identification code of the optical disk 25.
• the write strategy 'parameter corresponding to this individual identification code and other related parameters are stored in advance as a table. This correction parameter is prepared in advance for each recording medium.
• OPC Optical Power Calibration
• Data is written by performing CIRC or EFM code processing on the compressed captured image data prepared in the data buffer 3 and then blinking and driving the laser necessary for pit formation.
• Signals and write strategy signals are input to the OP unit 13 laser driver.
• writing is performed at a predetermined position along the file system based on the address of the frame unit obtained from the FMDT signal obtained by decoding ATIP. For the first write, the lead-in area during the subsequent close 'session Start writing from the position where the 20 megabyte area is skipped.
• a recording medium capable of recording data only once such as DVD-R and CD_R is used for recording data on the optical disc 25 based on a file system conforming to UDF specified by OSTA.
• OSTA a file system conforming to UDF specified by OSTA.
• additional recording is performed multiple times while ensuring compatibility with a dedicated disk playback device.
• the packet writing method is adopted in the UDF, and a link block in front of user 'data' and four Run-In areas are provided, and 2 at the end of user 'data.
• Data is written as a volume-structured packet with two Run-Out areas.
• 7 blocks are used as a link area that is a joint area between adjacent packets.
• media that can be recorded only once such as DVD-R and CDR
• data must be written continuously (incrementaly) toward the outer circumference without placing unwritten logical sectors.
• FIG. 3 shows a data layout immediately after the initialization process is performed on the optical disc.
• VRS Volume Eco Sequence Sequence
• the unrecorded area after the 512th logical sector is a partition, that is, a user data file and a file system related to the file, and a space for recording data. Its configuration is defined (described later).
• file data and related file system data can be recorded according to the UDF file system by packet writing method.
• AVDP chor Volume Descriptor Pointer
• VDS Volume Descriptor Sequence
• V is the volume structure (packet structure) in which the packet was written. It is allowed to place DS freely.
• AVDP is divided into three parts: the 256th logical sector, the last logical sector number N and N, and the logical sector number just 256 sectors before recording. It is agreed to record AVDP in at least two of them.
• AVDP ⁇ VDS ⁇ FSD (File Set Descriptor) ⁇ root' directory entry '(File Entry: FE) ⁇ root'directory's information control block (Information Control Block) It can be accessed in the order of Block: ICB) ⁇ File Identifier Descriptor (FID) in the root 'directory ⁇ ICB ⁇ Data of the file. It is necessary to analyze the VDS in order to perform disc playback in accordance with UDF, and the above arrangement regarding the arrangement of AVDP is extremely important in order to access the VDS.
• FSD File Set Descriptor
• the AVDP located on the outer peripheral side is susceptible to damage such as the user's hand swinging the disk, and the AVDP with the 256th logical sector number is less susceptible to damage. Therefore, there is a request to write AVDP in the 256th logical sector.
• a read-only device manufactured at a low cost only the 256th logical sector number AVDP can be read, and compatibility cannot be ensured unless the 256th logical sector number AVDP is written. Therefore, in this embodiment, as shown in FIG. 3, by setting the area from immediately after writing VRS at the time of initialization to the 512th logical sector number as a reserved area, the 256th in the future. In addition to maintaining the state in which AVDP can be written to the logical sector number, data writing can be started from the 512th onward.
• FIG. 4 shows a processing procedure for formatting the optical disc in the form of a flowchart.
• step Sl areas with logical sector numbers 0 to 511 are reserved.
• Step S3 After dummy data is recorded in the area from logical sector number 0 to 15 and padded (step S2), from the sector with logical sector number 16, standard information 1 specified by UDF The VRS is recorded (Step S3), and formatting of the disc ends.
• FIG. 5 shows a data layout after one additional recording has been performed on the optical disk that has been initialized with the data layout shown in FIG.
• File system data is a UDF file 'data structure, VDS, LVIS, AVDP, etc. that describes information about the UDF file system.
• VDS Volume Descriptor Sequence
• Consists of basic information about the file system configuration on the optical disk that describes information about the contents of the volume structure, such as the start position of the (Logical Volume Integrity Sequence) and pointer information to the Norate 'directory.
• the LVIS is data including information on the state of the optical disk, such as the free area size of the optical disk and the number of files.
• AVDP chor Volume Descriptor Pointer
• VDS and LDVIS can be placed freely. Two VDSs are placed, and AVDP is placed in the 256th logical section. (1st AVDP), it is agreed that AVDP is recorded in at least two of the three logical sector numbers N and N, which is the last logical sector number before 256 sectors (2nd). AVDP and 3rd AVDP). In addition, padding is applied to the surplus area between the 2nd AVDP and the 3rd AVDP.
• FIG. 6 shows a data layout after one additional recording is performed on the optical disk after the one additional recording shown in FIG. 5 is performed.
• a packet writing method is applied (described above). Following the last sector of the recorded area, the writing of the user 'data' file is started without leaving an unrecorded logical sector, and immediately after that, the file system data is written.
• the data includes UDF file structure information, FSDS, VDS, LVIS, AVDP, etc., and is recorded in the last logical sector number N and 256 sectors before the recorded logical sector number N and N.
• each newly written AVDP does not point to the old VDS, so the previously recorded file system 'data is derived from the newly recorded file system data. It is no longer referenced and becomes invalid data.
• FIG. 7 shows a data layout after finalizing the optical disk shown in FIG.
• logical sectors from the 32nd logical sector to the 511st logical sector immediately before the first user data file are recorded are reserved areas.
• AVDP recording starts from the 256th logical sector in accordance with the restrictions and mandatory conditions concerning data writing in the UDF. After the 32nd logical sector, dummy data is written to the 255th logical sector immediately before AVDP recording, and the 511th logical sector immediately after AVDP recording is performed, and padding is performed.
• the AVDP recorded from the 256th logical sector points to the two VDSs in the file system 'data recorded by the last additional recording. At this point, the VDS information is finalized, and so on. It will not be possible to perform additional recording on optical discs in a format that conforms to UDF.
• the file system recorded by the last additional recording ⁇ The two AVDPs in the data can also restrict the data writing in the UDF ⁇ The essential conditions can be satisfied, but the AVDP located on the outer circumference side is a disc The user's hand that handles the product is easily damaged. On the other hand, the AV DP of the inner circumference side, that is, the 256th logical sector number, is not easily damaged. In addition, there is a read-only device that can only read the AVDP of the 256th logical sector number, and the data 'layout as shown in FIG. 7 can ensure wide compatibility.
• FIG. 8 shows a processing procedure performed when a new disc is loaded in the recording unit 4 in the form of a flow chart.
• step Sl 1 the outermost circumference of the recorded area or the 256th logical sector is accessed to obtain file system data and analyze it.
• step S12 it is determined whether additional recording is possible for the loaded disc. This determination process is defined separately.
• step S15 If it is determined that additional recording is not possible, a read-only disc will be used thereafter. If it is determined that additional recording is possible, the disc is subsequently recognized as a disc capable of additional recording (step S15).
• FIG. 9 shows the procedure of the process for determining whether or not to allow additional recording on the disc, which is executed in step S12 of the flowchart shown in FIG.
• step S21 the 256th logical sector is accessed, and it is confirmed whether AVDP is recorded.
• step S22 If AVDP is recorded in the 256th logical sector, then it is checked whether the border of the recording area is closed.
• step S23 If the border is closed, it is determined that the disc is in a recordable state (step S23).
• FIG. 10 is a flowchart showing a processing procedure for recording user data on a formatted disc (including a disc after additional recording and before finalization processing).
• a file is additionally recorded in the outermost logical sector of the recorded area.
• the UDF file data structure is recorded in the form of additionally recording in the above file 'data (step S32).
• VD VD
• S and LVIS can be arranged freely.
• AVDP is recorded in the form of additional recording in the above VDS and LVIS (step S34). This AVDP points to two VDSs.
• step S35 After dummy data is recorded for 255 sectors in the form of additional recording in the AVDP and padded (step S35), two additional Vs are recorded in this dummy data.
• FIG. 11 shows a processing procedure for finalizing the disc in the form of a flowchart.
• dummy data is recorded in an area up to 255 logical sector numbers in the area reserved at the time of disc formatting (step S41).
• AVDP recording is performed from the 256th logical sector (step S42).
• the AVDP recorded here points to the two VDSs in the file system 'data recorded by the last additional recording. At this point, the VDS information is finalized, and thereafter the UDF is used for this optical disk. It becomes impossible to perform additional recording in a format according to.
• step S43 dummy data is recorded in the surplus reserved area from the end of AVDP recording to the 511st logical sector and padding is performed (step S43), and the finalization process is terminated.
• the embodiment in which the present invention is applied to additional recording on an optical disc that can be recorded only once according to the UDF format established by OSTA has been mainly described. This is not limited to this.
• the file system whose contents are not fixed until the end of additional recording is arranged on the inner circumference side of the disc, but the data must be recorded continuously from the innermost circumference. The same effect can be obtained by applying the present invention in the case where a file system 'format having the restrictions is imposed.
• the type of the recording medium is not particularly limited to the optical disc.

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