JP2005004897A - Recording device, reproducing device, and recording/reproducing device, and recording method, reproducing method, and recording /reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device, in which the recording density is improved by securing certain ability of an error correction and also the processing time of the error correction is reduced. <P>SOLUTION: The disk recording/reproducing device 1 is equipped with a memory 13 for storing the defective place of a disk 8 and the level of the defect, an error correction encoder 14 for applying the error correction encoding on data to be recorded in recording data, and a system control CPU 4 for controlling so as to carry out the error correction encoding with a low redundancy on the place having a comparatively lower defective level and to carry out the error correction encoding with a high redundancy on the place having a comparatively higher defective level, with respect to the error correction encoder 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc recording / reproducing system for recording digital data on a disc, for example.
[0002]
[Prior art]
In recent years, the surface recording density has dramatically improved in the disk recording / reproducing apparatus. However, the size of dust, scratches, etc., which are physical factors that alienate the reading of data from media, do not change. Accordingly, even with the same size of dust, the number of data errors increases compared to the amount of data errors in the conventional apparatus.
[0003]
In the optical disk apparatus, as shown in the following equation 1, the disk is picked up by reducing the thickness of the layer (t: cover thickness) that covers the recording layer with respect to the numerical aperture (NA) of the optical system. A margin (Skew) when tilted with respect to is secured.
[0004]
[Expression 1]
Skew = 1 / NA ^ 3 / t
[0005]
When the cover is thin, there is a case where dust having a size that has not been a problem in the prior art causes an error, and this also increases the error.
[0006]
In order to cope with the occurrence of such an error, it is a common practice for data recording / reproducing apparatuses to record and reproduce data with an error correction code added.
[0007]
A configuration example of a conventional disk device will be described below.
For media to be played back by a playback device that plays back a data string such as a disk device, in order to cope with the occurrence of errors during data playback, an error amount that normally occurs is estimated in advance, and this can be corrected sufficiently. Data is recorded with an error correction code (ECC) added. First, the configuration of the disk recording / reproducing apparatus 1 is shown in FIG.
[0008]
That is, data input from an external host computer 9 or a video photographing device via the interface (I / F) 10 is temporarily stored in the buffer memory 11. The buffer memory 11 is provided to absorb the difference between the data transfer rate between the interface 10 and the host computer 9 and the data transfer rate of the disk recording apparatus 1.
[0009]
If the data transfer rate between the interface 10 and the host computer 9 is slower than the data transfer rate of the disk recording device 1, the disk recording device 1 will read the disk when the buffer memory 11 becomes full with data sent from the interface 10 to the buffer memory 11. 8, an error correction code is added by the error correction encoder 14, and when the disk 8 is ready for recording, a signal is sent to the optical pickup 7 via the data recording amplifier 16 to record the data. To start.
[0010]
When the buffer memory 11 becomes empty, the recording is stopped, and it waits until the buffer memory 11 becomes full again by the data sent from the host computer 9, and the recording is started. On the contrary, when the data transfer rate of the disk recording apparatus 1 is relatively slower, the data transfer from the host computer 9 is waited. In general, this is not the case except for computer peripherals.
[0011]
On the other hand, when data is reproduced, the waveform from the data coming from the optical pickup 7 is shaped by the equalizer 17. Thereafter, the error correction decoder 19 corrects the error, stores the data in the buffer memory 11, and sends the data to the host computer 9 or the video playback device via the interface (I / F) 10.
[0012]
The medium is divided into a predetermined amount of data, and a physical address number is assigned to each medium. Also, using this address, the area on the disk is divided into a reserved area and a data recording area according to the purpose of use.
[0013]
The reserved area is placed at a certain address on the media. In the reserved area, there are a file allocation table (File Allocation Table) having information on where the recorded file exists on the physical address, and a defect management table (Defect Management Table) for managing the location of the defect on the medium. A file allocation table is used for data search during recording and reproduction. The Defect Management Table is built during the media manufacturing process or media initialization process (Format). However, depending on the recording / playback device that can monitor the recording conditions, a new defect management table can be created during recording. Address information may be added to a table (Defect Management Table).
[0014]
In the recording / reproducing apparatus as described above, if the error correction code is added more redundantly in order to increase the error correction capability as the surface recording density increases, the meaning of improving the surface recording density is halved.
[0015]
On the other hand, if the error correction code is left as it is, the number of Defects will increase too much, and the use efficiency of the disk will deteriorate.
[0016]
In order to prevent this, a method has been devised in which the data shuffling length is increased without changing the redundancy.
[0017]
An example is shown in FIG. 2A and 2B are diagrams showing an error correction format. FIG. 2A shows an error correction format with a short shuffling length, and FIG. 2B shows an error correction format with a long shuffling length.
[0018]
For example, consider an example of an optical disc system in which the recording length of 1-bit user data is 0.12 μm. That is, in the example of the code in FIG. 2A, when the shuffling length is 156 bytes in the recording direction 23 with respect to the user data 21 and the parity 22, the recording length on the 1-bit medium is 0.12 um. In this case, since it is possible to correct an error within 0.12 * 8 * 156 * 16 = 2.3 mm, it is possible to correct a defect having a size of 2.3 mm.
[0019]
However, as shown in FIG. 2B, if the shuffling length is increased to 302 bytes in the direction 26 in which the user data 24 and the parity 25 are recorded on the medium, the recording length on the 1-bit medium is 0.12 μm. In this case, it is possible to correct an error within 0.12 * 8 * 302 * 16 = 4.6 mm. Compared with FIG. 2A, the redundancy is the same, but the length of the error that can be corrected is doubled. Thus, it is possible to correct an error up to a defect having a size of 4.6 mm.
[0020]
On the other hand, when the shuffling length is long, the shortest data editing unit becomes long if it is left as it is, so that a complicated procedure such as so-called read modify write becomes necessary. Read-modify-write means that when data that is shorter than the shuffling length of the error correction format sent from the host computer 9 is to be recorded, the data for one shuffling length is once read from the disk 8 and reproduced as described above. The reproduction process is performed according to the procedure and stored in the buffer memory 11. One shuffling length data reproduced from the disk 8 on the buffer memory is replaced with data sent from the host computer 9 and written back to the disk 8 again. By performing such an operation, recording in an edit unit shorter than the shuffling length becomes possible. This results in an increase in time for recording data when recording a small unit of data.
[0021]
In the phase change type optical disk and magneto-optical disk used with the media in the cartridge, there is little possibility that the error will increase due to acquired scratches, so the error corrected by the error correction code is a congenital defect. And only random errors.
[0022]
In the conventional apparatus, such a code works effectively in a place where there is a defect of the maximum size that can be corrected by the correction code. However, in order to deal with these worst cases, it is necessary to adapt such codes to places where there are no defects, and as a result, redundant data is wasted and the recording density is reduced accordingly. Inviting was a drawback. Alternatively, when the data shuffling length is long, the shortest edit unit becomes large, or the procedure for recording the shortest edit unit increases.
[0023]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 7-311949
[0024]
[Problems to be solved by the invention]
However, in the error correction method in the conventional recording / reproducing apparatus described above, the error correction code added for the purpose of dealing with errors caused by dust or scratches in the recording / reproducing apparatus using a disk or tape is a dust There is a disadvantage in that the recording density on the medium is impaired because an amount that can cope with the worst case is added to a place where there is no scratch.
[0025]
In addition, in order to deal with large dust scratches, in a data recording apparatus having an error correction format in which the data shuffling length is increased, read-modify-write is performed in order to shorten the shortest edit unit or reduce the shortest edit unit. Therefore, there are inconveniences that the processing becomes complicated and the processing time increases.
[0026]
Further, Patent Document 1 shows an error correction method in a conventional recording / reproducing apparatus. Among the problems to be solved, there is too much error correction code redundant data as in the present invention. However, this is dealt with by changing the shuffling length of data, and the error correction capability is not dynamically changed as in the present invention.
[0027]
Therefore, the present invention has been made in view of the above points, and it is an object of the present invention to provide an apparatus that ensures sufficient error correction capability, improves recording density, and shortens error correction processing time. And
[0028]
[Means for Solving the Problems]
The recording / reproducing apparatus of the present invention has, for example, a magneto-optical and phase-change type disk recording / reproducing apparatus, etc., having a table for managing the defect location of the medium and its defect level. By using low error correction coding and performing error correction coding with high redundancy at locations with high defect levels, it is possible to increase the media usage efficiency by changing the redundancy according to the risk of being unable to correct. It is possible.
[0029]
Therefore, according to the present invention, the following operations are performed.
It is possible to determine the number of parity necessary for correcting a defect in the media at the time of formatting. As a result, when there is a large defect on the medium, it is possible to record user data in the portion where the conventional alternate sector processing has been performed by using more parity for error correction. Thus, the data recording efficiency can be further increased.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings as appropriate.
[0031]
FIG. 1 is a block diagram showing a configuration of a disk recording / reproducing apparatus applied to an embodiment of the present invention.
Here, the basic format of error correction is, for example, that of FIG. That is, a 32-byte parity 25 is added to the 216-byte user data 24 by a Reed-Solomon code, and 302 pieces are stored in the memory 13, and this is stored in one error correction code addition processing unit. And
[0032]
It is based on a format in which recording is performed on media in a straight line with it. As shown in FIG. 3, the medium used in this apparatus is assigned a monotonically increasing physical address from the innermost circumference 31 to the outermost circumference 32 (or from the outer circumference to the inner circumference) of the disk 8, and the recording of the address is performed. The method is a wobble address or other general recording method. The present invention is effective regardless of the address recording method.
[0033]
Also, one physical address corresponds to one error correction code addition processing unit. One logical address is defined as one sector. Regarding the correspondence between the logical address and the sector, a plurality of sectors may correspond to one logical address by the system.
[0034]
This monotonically increasing physical address is divided into the following three areas. As shown in FIG. 3, the physical address is divided into a management area 33, a replacement sector area 34, and a user data area 35.
[0035]
In addition, it is assumed that data is accessed from the host computer 9 using logical addresses, and the correspondence between the logical addresses and the physical addresses is performed by the disk drive based on information included in a management area 33 described later.
[0036]
As shown by 35-1, 35-2,..., 35-N, the user data area 35 is equally divided into N and managed and operated, and this divided unit is referred to as a “redundancy setting unit” for convenience. (1) 35-1, 35-2 (2), ... 35-N (N).
[0037]
“Redundancy setting unit” (1) 35-1, 35-2 (2),... 35-N (N) is set for each error correction redundancy. Redundancy settings shall be based on the replacement source.
[0038]
The management area 33 and the replacement sector area 34 are provided at a predetermined physical address on the disk 8.
[0039]
The management area 33 includes a format flag, a defective sector list, a redundancy setting unit number, and unit information as described below.
[0040]
An example of the management area 33 shown in FIG. 3 is shown in FIG.
The explanation of each area is as follows.
In FIG. 4, a Format flag 41 is a Format flag 42 indicating an error correction format.
[0041]
The bad sector list 43 includes bad sector physical addresses 44-1, 44-2-1, 44-3-1. This is a list of replacement sector physical addresses 44-1-2, 44-2-2, 44-3-2, ... 44-M-2.
[0042]
The redundancy setting unit number 45 is the redundancy setting unit number 46 existing in the user data area 35. The greater the number, the higher the data storage efficiency.
[0043]
The unit information 47 includes the following three pieces of information of each “redundancy setting unit”, start logical addresses 48-1-1, 48-2-1, 48-3-1... 48-M-1, Size 48-1-2, 48-2-2, 48-3-2 ... 48-M-2 and risk frequency 48-1-3, 48-2-3, 48-3-3 ... 48 -M-3 is included. The risk frequency is set at the time of “format processing”, and based on this frequency, the “redundancy” of the error correction code of each redundancy setting unit is changed.
[0044]
The operation of the disc recording / reproducing apparatus applied to the embodiment of the present invention configured as described above will be described below.
[0045]
Here, the detailed operation description of the “format processing” is shown below.
FIG. 5 is a flowchart for formatting. The format process is performed by the user at the start of media use.
[0046]
In FIG. 5, basic information is determined in step S1. Specifically, the system control CPU 4 determines in advance the number of redundancy setting units included in the disk 8 and the start logical address of each unit. The system control CPU 4 gives the information of management area information (bad sector list + unit information) constructed in the memory 13 attached to the system control CPU 4 to the error correction encoder 14, records it in the management area, and performs format processing. Prior to starting, the drive builds a table of information included in the temporary management area on the memory 13 of the CPU 4 that controls the drive.
[0047]
In step S2, the disc is inserted. Specifically, the user inserts a disc into the device.
[0048]
In step S3, the pickup is moved. Specifically, the system control CPU 4 moves the optical pickup 7 to the inner periphery of the disk 8 by the servo control 5 and moves the optical pickup 7 to the position of the management area.
[0049]
In step S4, error correction capability is set. Specifically, the system control CPU 4 maximizes the error correction capability for the error correction encoder 14.
[0050]
In step S5, recording is started. Specifically, the system control CPU 4 starts recording on the disk 8 by the optical pickup 7.
[0051]
In step S6, the recording ends. Specifically, the system control CPU 4 ends the recording at the outermost periphery of the disk 8 by the optical pickup 7. When the formatting process is started, random data obtained by adding 32-byte parity to 216-byte user data, for example, as shown in FIG. 2 (b) from the beginning to the end of the user data area and the alternate sector area Record.
[0052]
In step S7, the pickup is moved. Specifically, the system control CPU 4 moves the optical pickup 7 to the inner periphery of the disk 8 again by the servo control 5.
[0053]
In step S8, reproduction is started. Specifically, the system control CPU 4 starts reproduction of the user data area from the beginning to the end of the disk 8 by the optical pickup 7.
[0054]
In step S9, the number of errors is monitored and determined. Specifically, the system control CPU 4 monitors the number of error corrections for each code and the success / failure of error correction when the error correction decoder 19 performs error correction in units of codes at the same time as reproduction. The system control CPU 4 holds the maximum number of error corrections for each redundancy setting unit.
[0055]
If the error cannot be corrected in step S9, the process proceeds to step S11. If the error can be corrected, the process proceeds to step S10.
[0056]
In step S10, the risk frequency is registered. Specifically, the system control CPU 4 associates the maximum value of the risk frequency with the start logical address of a predetermined redundancy setting unit, and stores the risk frequency for each redundancy setting unit in the memory 13 attached to the system control CPU 4. To keep. When the system control CPU 4 monitors the error correction number of each error correction code included in the sectors other than the bad sector, this monitoring is performed for each “redundancy setting unit”. Is registered in the risk frequency table of unit information.
[0057]
In step S11, a bad sector is registered. Specifically, in particular, when error correction becomes impossible, the system control CPU 4 determines a physical address in the replacement sector area for the physical address, and a defective sector list is also stored in the system control CPU 4. Build in the memory 13. The system control CPU 4 registers the physical address in the bad sector list on the memory 13 when a sector including a code for which error correction has been unsuccessful is detected.
[0058]
In step S12, the reproduction ends. Specifically, the system control CPU 4 ends the reproduction at the outermost periphery of the disk 8 by the optical pickup 7. When the reproduction of the user data area and the replacement sector area is completed, the system control CPU 4 arbitrarily selects the physical address of the replacement sector for the previously registered defective sector from the replacement sector area. In FIG. 5, sectors where error correction is unsuccessful are excluded.
[0059]
In step S13, the management area on the medium is updated. Specifically, when ejecting the disk 8 from the apparatus, the system control CPU 4 updates the management area on the disk 8 with the optical pickup 7. The system control CPU 4 needs to write the information contained in the management area existing on the memory 13 to the management area on the medium. However, depending on the drive implementation method, this medium is ejected from the drive instead of at the end of formatting. It doesn't matter when In addition, when the management information is written, a flag indicating that formatting has been performed is set and stored.
[0060]
Next, the detailed operation when data is recorded on this medium will be described below.
[0061]
First, when a medium is inserted into the apparatus, the system control CPU 4 reads the contents of the management area. At this time, the user is requested to format the unformatted disc.
[0062]
Next, when there is a data write request for a certain logical address from the host computer, the system control CPU 4 looks at the management area, and if the drive is not registered in the bad sector, the system control CPU 4 sends data to the corresponding physical address in the user data area. If there is a registration, it is recorded at a physical address in the alternate sector area.
[0063]
Then, the system control CPU 4 looks at the value recorded in the risk frequency of the unit information at the time of recording, and sets a number with a slight margin in this value as the parity number in the error correction circuit. The error correction circuit encodes and records data by changing only the number of parity without changing the code length at the time of formatting.
[0064]
This setting is limited to the numerical value set as the number of parity at the time of formatting, but it is assumed that the degree of margin is free for implementation.
[0065]
In addition, the amount of user data per code increases by subtracting the number of parity at the time of actual recording from the number of parity at the time of formatting.
[0066]
As a specific example, it is assumed that the code length is 248 bytes, the number of parity is 32 bytes at the time of formatting, and the uncorrectable risk frequency of a certain “redundancy setting unit” is 2.
[0067]
In consideration of this, it is considered that data is recorded with a margin of 4 and a parity number of 6. User data is increased by 32−6 = 26 bytes per code. That is, assuming that the number of parities is 32 bytes at the maximum, the amount of user data in this case is 216 bytes, so that (216 + 26) /216=1.12 times increase.
[0068]
Next, a flowchart when the management table is updated at a time other than formatting will be described.
[0069]
FIG. 6 is a flowchart for reading.
In step S21, the disc is inserted. Specifically, the user inserts a recorded disc into the apparatus.
[0070]
In step S22, the pickup is moved. Specifically, the system control CPU 4 moves the optical pickup 7 to the inner periphery of the disk 8 by the servo control 5 and moves the optical pickup 7 to the position of the management area.
[0071]
In step S23, the management area is reproduced. Specifically, the system control CPU 4 reads data recorded in the management area with respect to the disk 8 by the optical pickup 7. The read data is stored in the memory 13 attached to the system control CPU 4.
[0072]
In step S24, the optical pickup is moved.
Specifically, the servo control 5 moves the optical pickup 7 to a position on the disk 8 instructed by the system control CPU 4.
[0073]
In step S25, the number of error correction parities is determined. Specifically, the system control CPU 4 performs error correction decoding by the error correction decoder 19 at the time of data reading. Based on information on a management area existing in the memory 13 attached to the system control CPU 4 in advance. The number of error correction parities at the relevant location is determined.
[0074]
In step S26, data is reproduced. Specifically, the system control CPU 4 reproduces recorded data in the user data area on the disk 8 by the optical pickup 7. If there is a data read request for a certain logical address from the host computer 9 at the time of data reproduction, the device looks at the management area and if there is a registration in a bad sector, the device uses the physical address in the corresponding alternate sector area if there is no registration. Data is read from the corresponding physical address in the data area. At that time, the management area is viewed, and the “redundancy” corresponding to the physical address is set in the error correction circuit, so that the data is reproduced correctly. Is called.
[0075]
In step S27, a data unreadable state occurs. Specifically, the system control CPU 4 assumes a case where the data in the relevant part cannot be read when error correction becomes impossible due to media deterioration or damage to the acquired media.
[0076]
In step S28, the pickup is moved. Specifically, the system control CPU 4 moves the optical pickup 7 to the head of that part of the disk 8 by the servo control 5.
[0077]
In step S29, the number of error corrections is reset. Specifically, the system control CPU 4 sets the error correction capability to the maximum.
[0078]
In step S30, recording is performed. Specifically, the system control CPU 4 starts recording on the disk 8 by the optical pickup 7.
[0079]
In step S31, the pickup is moved. Specifically, the system control CPU 4 moves the optical pickup 7 to the head of the corresponding portion of the disk 8 again by the servo control 5.
[0080]
In step S32, data is reproduced. Specifically, the system control CPU 4 reproduces recorded data in the user data area on the disk 8 by the optical pickup 7.
[0081]
In step S33, the number of errors is monitored and determined.
Specifically, the system control CPU 4 stores the maximum value of the number of error corrections for each code reported by the error correction decoder 19 in the memory 13 attached to the system control CPU 4. At this time, if the error cannot be corrected, the process proceeds to step S35. If the error can be corrected, the process proceeds to step S34.
[0082]
In step S34, the risk frequency is re-registered. Specifically, when the error correction is successful, the system control CPU 4 associates the maximum number of corrections with the start logical address of a predetermined redundancy setting unit, and updates the risk frequency of this redundancy setting unit. The data is stored in the memory 13 attached to the system control CPU 4.
[0083]
In step S35, the bad sector is re-registered. More specifically, if the error cannot be corrected, the system control CPU 4 sets this as a bad sector, the physical address and the system control in the bad sector list in the management area information stored in the memory 13 attached to the system control CPU 4. The alternate sector physical address determined by the CPU 4 is updated.
[0084]
In step S36, the management area on the memory is updated. Specifically, after the reproduction is finished, the system control CPU 4 includes the risk frequency of the redundancy setting unit to which the part belongs, which is included in the management area information stored in the memory 13 attached to the system control CPU 4 in advance. Update.
[0085]
In step S37, the management area on the medium is updated. Specifically, the management area on the disk 8 is updated when the disk 8 is ejected.
[0086]
Here, an example based on an error correction format in which a parity of 32 bytes is added to 216 bytes has been introduced. However, by increasing the number of parity at the time of formatting, even when a larger defect exists on the medium, the number of parity necessary for correcting it at the time of formatting can be determined. If there is a large defect on the medium using this fact, it is possible to apply more parity to the medium. User data can be recorded, and the data recording efficiency can be further increased.
[0087]
Here, when the disk 8 is an optical disk or a magneto-optical disk, EFM (Eight to Future Modulation) modulation and EFM demodulation are used in the modulator 15 and the demodulator 18, but in the case of a Blu-ray Disc (Blue Ray Disc). 17PP (one seven parity preserved rmtr: see Japanese Patent Application No. 10-150280) Modulation and demodulation are used.
[0088]
Needless to say, the present invention is not limited to the above-described embodiment, and other configurations can be appropriately employed without departing from the scope of the claims of the present invention.
[0089]
【The invention's effect】
According to the present invention, since it is only necessary to record the error correction parity corresponding to the defect on the medium, it is possible to divert the parity that has been recorded wastefully to the recording of user data. The recording efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a disk recording / reproducing apparatus applied to an embodiment of the present invention.
2A and 2B are diagrams showing an error correction format. FIG. 2A shows an error correction format with a short shuffling length, and FIG. 2B shows an error correction format with a long shuffling length.
FIG. 3 is a diagram showing an arrangement of areas on a disc.
FIG. 4 is a diagram illustrating an example of a management area.
FIG. 5 is a flowchart at the time of formatting.
FIG. 6 is a flowchart at the time of reading.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Disc recording / reproducing apparatus, 2 ... Signal processing part, 3 ... Work memory, 4 ... System control, 5 ... Servo control, 6 ... Spindle motor, 7 ... Optical pick-up, 8 ... Disc, 9: Host computer, 10: Host interface, 11: Buffer memory, 12: Memory control, 13: Memory, 14: Error correction encoder, 15 ... Modulator, 16 ... Recording amplifier, 17: Equalizer, 18: Demodulator, 19: Error correction decoder, 21: User data, 22: Parity, 23: Direction for recording on media, 24: User data, 25 ... ... Parity, 26... Recording direction on media, 31... Innermost disc, 32 .. outermost disc, 33... Management area, 34. ), 35... User data area, 35-1... Redundancy setting unit (1), 35-2... Redundancy setting unit (2), 35 -N. ... Format flag, 42 ... Format flag, 43 ... Bad sector list, 44-1-1 ... Bad sector physical address, 44-1-2 ... Alternate sector physical address, 44-2-1 ... Bad sector Physical address, 44-2-2 ... alternate sector physical address, 44-3-1 ... bad sector physical address, 44-3-2 ... alternate sector physical address, 44-M-1 ... bad sector physical address 44-M-2 ... alternate sector physical address, 45 ... redundancy setting unit number, 46 ... redundancy setting unit number, 47 ... unit information, 48-1-1 ... start logical address, 48- 1-2 …… Unit size 48-1-3. Risk frequency, 48-2-1 ... Start logical address, 48-2-2 ... Unit size, 48-2-3 ... Risk frequency, 48-3-1 ... Start logical address, 48-3-2 ... Unit size, 48-3-3 ... Risk frequency, 48-N-1 ... Start logical address, 48-N-2 ... Unit size, 48-N -3 …… Risk frequency

Claims (12)

In a recording apparatus for recording on a recording medium by performing signal processing for recording on data supplied from a data supply source,
Defect management means for managing the defect location of the recording medium and the level of the defect;
Error correction encoding means for performing error correction encoding on data to be recorded at the time of data recording;
For the error correction coding means, error correction coding with low redundancy is performed at a relatively low defect level managed by the defect management means, and redundancy is performed at a relatively high defect level. A recording apparatus comprising: control means for controlling to perform high error correction coding. The recording apparatus according to claim 1,
The defect management means updates the management data according to whether error correction is possible or not. In a reproducing apparatus for reproducing data reproduced by performing signal processing for reproduction on data recorded on a recording medium and transferring the reproduced data to a data transfer destination,
Defect management means for managing the defect location of the recording medium and the level of the defect;
Error correction decoding means for performing error correction decoding on the data to be reproduced;
When data is recorded, the error correction coding means is subjected to error correction coding with a low redundancy at locations with a relatively low defect level managed by the defect management means, and redundant at locations with a relatively high defect level. When reproducing highly error-corrected encoded data, the error-correcting decoding means has a low-redundancy error-correcting decoding at a relatively low defect level managed by the defect managing means. And a control means for performing control so that error correction decoding with high redundancy is performed at a relatively high defect level. The playback apparatus according to claim 3, wherein
The reproducing apparatus according to claim 1, wherein the defect management means updates management data in accordance with whether error correction is possible. The data supplied from the data supply source is subjected to signal processing for recording and recorded on a recording medium, and the data reproduced and reproduced by performing signal processing for reproduction on the data recorded on the recording medium. In a recording / playback device that transfers data to a destination,
Defect management means for managing the defect location of the recording medium and the level of the defect;
Error correction encoding means for performing error correction encoding on data to be recorded at the time of data recording;
Error correction decoding means for performing error correction decoding on data to be reproduced at the time of data reproduction;
For the error correction coding means, error correction coding with low redundancy is performed at a relatively low defect level managed by the defect management means, and redundancy is performed at a relatively high defect level. In addition to performing high error correction coding, the error correction decoding means performs error correction decoding with low redundancy at a relatively low defect level managed by the defect management means, A recording / reproducing apparatus comprising control means for controlling to perform error correction decoding with high redundancy at a relatively high location. The recording / reproducing apparatus according to claim 5.
The defect management means updates the management data according to whether error correction is possible or not. In a recording method in a recording apparatus for performing signal processing for recording on data supplied from a data supply source and recording the data on a recording medium,
A defect reproduction step of reproducing the defect location of the recording medium and the level of the defect from the defect management means;
An error correction encoding step of performing error correction encoding on the data to be recorded at the time of data recording by error correction encoding means;
For the error correction coding means, error correction coding with low redundancy is performed at a relatively low defect level managed by the defect management means, and redundancy is performed at a relatively high defect level. A control step controlled by the control means to perform high error correction encoding, a defect management step for managing the defect location of the recording medium and the level of the defect in the defect management means,
A recording method comprising: The recording method according to claim 7, wherein
The recording method according to claim 1, wherein the defect management means updates management data according to whether error correction is possible. In a reproducing method in a reproducing apparatus for reproducing data reproduced by performing signal processing for reproduction on data recorded on a recording medium and transferring the reproduced data to a data transfer destination,
A defect reproduction step of reproducing the defect location of the recording medium and the level of the defect from the defect management means;
An error correction decoding step of performing error correction decoding on the data to be reproduced by error correction decoding means;
When data is recorded, the error correction coding means is subjected to error correction coding with a low redundancy at locations with a relatively low defect level managed by the defect management means, and redundant at locations with a relatively high defect level. When reproducing highly error-correction-encoded data, the error-correcting decoding means is less error-recovery corrected at a relatively low defect level managed by the defect management means. The control step for controlling by the control means to perform error correction decoding with a high degree of redundancy, and the defect location of the recording medium and the level of the defect by the defect management means. Defect management steps to manage,
A playback method characterized by comprising: The reproduction method according to claim 9, wherein
The reproduction method according to claim 1, wherein the defect management means updates the management data according to whether error correction is possible. The data supplied from the data supply source is subjected to signal processing for recording and recorded on a recording medium, and the data reproduced and reproduced by performing signal processing for reproduction on the data recorded on the recording medium. In a recording / reproducing method in a recording / reproducing apparatus for transferring to a data transfer destination,
A first defect reproduction step of reproducing the defect location of the recording medium and the level of the defect from the defect management means;
An error correction encoding step of performing error correction encoding on the data to be recorded at the time of data recording by error correction encoding means;
For the error correction coding means, error correction coding with low redundancy is performed at a relatively low defect level managed by the defect management means, and redundancy is performed at a relatively high defect level. A first control step controlled by the control means to perform high error correction encoding; a first defect management step for managing the defect location of the recording medium and the level of the defect in the defect management means;
A second defect reproduction step of reproducing the defect location of the recording medium and the level of the defect from the defect management means;
An error correction decoding step of performing error correction decoding on the data to be reproduced by error correction decoding means;
When data is recorded, the error correction coding means is subjected to error correction coding with a low redundancy at locations with a relatively low defect level managed by the defect management means, and redundant at locations with a relatively high defect level. When reproducing highly error-correction-encoded data, the error-correcting decoding means is less error-recovery corrected at a relatively low defect level managed by the defect management means. And a second control step in which the control means controls the error correction decoding with a high redundancy at a relatively high defect level, the defect location of the recording medium, and the defect level. A second defect management step managed by the management means;
A recording / reproducing method comprising: The recording / reproducing method according to claim 11,
The recording / reproducing method, wherein the defect management means updates the management data according to whether error correction is possible.

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