JP2003242728A - Optical disk device and data randomizing method for optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply a random seed scramble for preventing the deterioration of a medium to the next generation optical disk. <P>SOLUTION: A seed is stored to a BIS area. ID or EDC is checked to hold interchangeability before and after scramble release. When no error is generated in data before the scramble release, it is recognized as an unscrambled disk. When no error is generated in data after the scramble release, it is recognized as a scrambled disk. An information storing area showing an area to be rewritten by performing the scramble and an area to be rewritten without performing the scramble is arranged. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc device such as a DVD, and more particularly to a data scrambling method when recording data on a medium in the optical disc device.

[0002]

2. Description of the Related Art Generally, in a rewritable optical disk such as a DVD-RAM, data is written on a track of the disk by generating a recording mark by optical power. Further, the data is read by utilizing the difference in the reflectance of light between the recording mark and the other portion. In the DVD-RAM, a groove called a groove is formed on the disk, and data is written in both the groove (land) and the non-groove portion (groove) to increase the density.

In a recording / reproducing apparatus using a disk type recording medium, control for accurately positioning a head on a track is called tracking. With DVD-RAM,
Lands and grooves are formed by applying a slight vibration called wobble, and tracking is performed by using this. However, if the same data is written in the adjacent tracks, the tracking signal becomes weak and the tracking is likely to be lost. In a DVD that handles images, sounds, etc., it often happens that a large amount of the same data such as a silent portion is written. In order to solve this problem, various measures have been taken to prevent the write data of adjacent tracks from becoming the same even if a large amount of the same data is written by the user.

For example, as disclosed in Japanese Unexamined Patent Publication No. 6-274885, there is a method of changing the start of a sector from a mark or from a non-mark for each track. Also, STANDARD-EC
DVD-RAM, as described in MA-272
Then, an ID sequence of each frame is used as an initial value (seed) to generate an M sequence (random sequence), which is added to user data and then written to a disc. Randomizing data in this way is generally called scrambling.

On the other hand, in the field of optical communication, a method called guided scrambling has been used for the purpose of producing a run length limited code suitable for optical communication and having a flat frequency characteristic. This is close to the desired characteristics from the data created by adding a data with a sufficiently large space to the beginning of the data for which the run length limited code is to be created and then randomizing each of them. The choice is one. For such technology, for example, "CO
DES FOR MASS DATA STORAGE SYSTEMS ”KAS IMM
INK, SHANNON FOUNDATION PUBLISHER, 1999. Also, in the paper, “POLYNOMIALS FOR GU
IDED SCRAMBLING LINE CODE ”, IEEE JOURNAL ON SELE
CTED AREAS IN COMMUNICATIONS, Vol. 13, NO. 3, APRI
L, 1995 etc.

In recent years, a high density optical disc using a blue-violet laser has been proposed. For such technology, for example, "OPTICAL DISC SYSTEM FOR DIGITAL
VIDEO RECORDING ”, TATSUYA NARAHARA JPN. J.
APPL. PHYS. VOL. 39 (2000) PP. 912-919 PART
1, NO. 2B, FEBRUARY 2000 etc.

FIG. 10 shows a method of formatting the optical disk described in this paper. User data is 64Kb
The error correction coding is performed for each yte and the data is written on the disk medium. For optical discs, the current DVD-
Also in the RAM and the like, reading and writing is performed in units of 2048 bytes, and this is called a logical sector. The input user data becomes 2052 bytes by adding an error check code EDC of 4 bytes. The logical sector to which this EDC is added is grouped into 8 sectors, and it is recorded in 216 bytes.
Divide each into 76 pieces. Each is [248,216,3
3] Encoded into the Red Solomon code and grouped for 8 sectors and arranged in a region (38 bytes × 496 bytes) of (A) 1001 shown in FIG. This 38
An area of bytes × 496 bytes is called an LDC. Similarly, for each 8 sectors, (B) 1002, (C) 10
The area 03, (D) 1004 is also filled. Below, Reed
The Solomon code is called an RS code.

Next, the address for 8 × 4 = 32 sectors, copy protection information, alternative sector information, etc. are stored in 30b.
24 [62,30,33] RS divided by yte
Encode into a code. This is written in each of the three BIS areas 1005 to 1007 in FIG. From this signal to which the synchronization signal 1008 is added, data is taken out in the horizontal direction as shown by arrow 1009 and written on the optical disc medium. At the time of data reproduction, the data read from the optical disc medium is arranged in the order shown by the arrow 1009,
After arranging so as to have the format shown in FIG. 10, error correction processing or the like is performed.

[0009]

By the way, in the optical disk using the next-generation high-density format introduced in the prior art, the physical location (sector) on the optical disk medium is the same.
In addition, when the same data was written many times, the medium deteriorated, and when writing new data, the previous data remained and appeared as noise. Further, since the optical disc is a replaceable medium, compatibility is important, and it is necessary to easily read and write when introducing a new technique, even when using an optical disc medium to which a conventional new technique is not introduced.

[0010]

In the scrambling method according to the present invention, in order to solve the above-mentioned problem, the next-generation high-density optical disk introduced in the prior art is scrambled with data by using an arbitrary seed. Preferably, arbitrary seed data for randomization is added to the original data to be recorded on the disc. More preferably,
The original data to be recorded on the disc has additional information such as sector number and copy protection added.
The address is scrambled with it. The randomized data, the additional information and the seed data are encoded into an error correction code. Further, the data is stored in the LDC area, and the additional information and the seed are stored in the BIS area. Further, according to the scrambling method of the present invention, 1-bit randomized data is determined by an operation using 1-bit original data or seed data and a plurality of bits of past randomized data. According to another aspect of the present invention, a descrambling method that does not require seed data is provided. Specifically, it is characterized in that at the time of data reproduction, 1-bit derandomization data is determined by an operation using a plurality of bits of randomization data. Further, according to another aspect of the present invention, even when a randomized area and a non-randomized area are mixed in one disk, a disk that supports randomization and a disk that does not You can read and write with the same device without problems. Specifically, regarding reading, descrambling is performed by detecting an error detection code or position information of the data, and if there is an error, it is regarded as scrambled. Regarding writing, an area for storing discrimination information is provided in the disc. Further, the optical disk medium is provided with an area to be written without being scrambled and an area to be written with being scrambled so as to be accessed by a device that does not support scrambling.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment of the present invention will be described below with reference to FIGS. FIG. 3 is a schematic block diagram showing the configuration of the optical disc device of the present embodiment. The embodiments described below do not limit the present invention, and the optical disk device of the present invention is a storage device used in a computer system as in the present embodiment, as well as a stationary image and audio connected to a television. It may be used as a recording / reproducing apparatus such as a recording / reproducing apparatus, a portable video camera, a portable audio reproducing apparatus, or the like.

In FIG. 3, a host interface (host I / F) 311 controls data transfer between the optical disk device and a host computer such as a personal computer (not shown). The scramble circuit 309 randomizes the data. Error correction coding circuit 307
Adds an error correction code to the randomized data. The run length limiting encoding circuit 305 modulates the data to which the error correction code is added according to a predetermined rule and converts it into data that can be recorded on the optical disc 301 as a recording medium. The recording / reproducing amplifier 303 receives the encoded data from the run length limiting encoding circuit 305 and converts it into a voltage waveform suitable for the recording / reproducing head 302. The recording / reproducing head 302 converts the received voltage waveform into an optical laser, and the optical power causes the optical disk 30 to operate.
Write the mark on 1. At the time of reading data, the recording / reproducing head 302 irradiates the optical disk 301 with laser light, reads the data by the reflected light by utilizing the difference in the reflection intensity of the light of the mark and the non-mark, and converts the read information into an electric signal. .

The electric signal is appropriately amplified by the recording / reproducing amplifier 303 and then output to the data reproducing circuit 304. The data reproducing circuit 304 converts the read analog signal into a digital information sequence of 0 and 1. In the run length limited code decoding circuit 306, the obtained data string is demodulated in the opposite manner to the run length limited coding circuit 305. The error correction circuit 308 determines an error position and an error value based on the error correction code added by the error correction coding circuit 307, and corrects the error. The data in which the error has been corrected is restored to the original data by the descramble circuit 310. In the optical disk device, data recording / reproduction is performed by the above procedure.

The scramble circuit 309 will be described in detail. FIG. 4 is a detailed block diagram of the scramble circuit 309. The user data sent from the host I / F 311 is added to the fixed random sequence generated by the M sequence generator 401 by the EOR circuit 402, and then input to the random seed scrambler 403. FIG. 5 is a detailed circuit diagram of the M-sequence generator 401. Reference numerals 502 to 516 are registers that store data in 1-bit units, and perform a shift operation in synchronization with input user data. Fifty
1 is an exclusive OR circuit. Initially, only register 516 is set to 1 and registers 502 through 51
4 is set to 0. In this embodiment, 1 shown in Expression 1
An M-sequence generator with a 5th order polynomial is assumed. Hereinafter, all polynomials used in this embodiment are Galois fields (GF
(2)) It is a polynomial in the above, and “+” indicates exclusive OR.

[0015]

[Equation 1]

The sequence generated by the M sequence generator 401 is a pseudo random sequence having a period of 2 ^ 15-1 = 32767. Here, a ^ b is defined as a to the power b. Hereinafter, the b-th power of a will be referred to as a ^ b. In the present embodiment, the M sequence generator 401 is not always necessary,
Only the random seed scrambler 403 may be used. However, in order to improve the random performance, the M sequence generator 401 is also used in this embodiment.

In the random seed scrambler 403, first, as shown in FIG. 9, 8-bit data is added to the beginning of the data. This is arbitrary 8-bit data, and may be data created based on the writing time or the like, or may be a value incremented by 1 each time writing is performed by the 8-bit increment counter. . The additional 8 bits serve as a seed for randomization. In the present embodiment, since 8-bit data is added, 2 bits from “00000000” to “11111111” are added.
8 = 256 kinds of randomization can be performed. That is, when the same user data is physically recorded in the same place, the probability that the actually written data will be the same is 1/2.
56. The same applies when writing the same user data in adjacent tracks. By performing the randomization in this way, it becomes possible to avoid the alteration of the optical disc 301 and reduce the tracking error. The data to be added does not need to be 8 bits and may be more or less. Further, the additional bit (initial value) does not have to be attached to the head of the user data, and may be placed anywhere in the user data. From the point where data (initial value) is added, the latter is generated as a different series for each initial value. In the present embodiment, the additional data is placed at the head that can be randomized most efficiently.

FIG. 6 is a detailed circuit diagram of the secondary scramble circuit 405. Reference numerals 601 to 604 are exclusive OR circuits, and reference numerals 605 to 612 are registers that store data in 1-bit units. Registers 605 to 612 are
Initially set to 0. The secondary scramble circuit 405 performs a shift operation in synchronization with input data. With this circuit, the scramble shown in Expression 2 is performed.

[0019]

[Equation 2]

Here, bi is the i-th bit data before entering the secondary scramble circuit, and Ci-j is the j-th bit data before the i-th data output from the secondary scramble circuit. As can be seen from this equation, Ci is made up of 1-bit unscrambled data and multiple-bit scrambled past data. In this way, the data is scrambled and then sent to the error correction coding circuit 307.

Next, the descramble circuit 310 will be described in detail. FIG. 7 is a detailed block diagram of the descramble circuit 310. FIG. 8 is a detailed circuit diagram of the secondary descramble circuit 704 of FIG. 801 to 808 is 1
A register that stores data in bit units. 809 to 8
Reference numeral 12 is an exclusive OR circuit. Similarly to the secondary scramble circuit 405, the secondary scramble circuit 704 also performs a shift operation in synchronization with input data.

Next, the operation of the descramble circuit 310 will be described. The data whose error has been corrected by the error correction circuit 308 is the random seed descrambler 70.
3 is input to the secondary descramble circuit 704. The secondary descrambling circuit 704 performs descrambling shown in Expression 3.

[0023]

[Equation 3]

Here, bi is the descrambled i-th bit user data, and ci-j is the error correction circuit 30.
It is the data before the i-th bit and the j-th bit input from 8. As can be seen from this equation, when descrambling is performed, descrambling can be performed even if the initial scrambling value is not known. In addition, the error correction circuit 308
When an uncorrectable error occurs in, the error is expanded by 8 bits in the descrambled user data. However, the error propagation is only 8 bits and does not spread any further.

Next, as shown in FIG. 9, the random data deletion circuit 705 deletes the additional 8 bits added by the random data addition circuit 404.

The M-sequence generator 701 is used by the M-sequence generator 40.
1 and is shown in FIG. The user data is decrypted by adding the same things with the exclusive OR 702.

In the present embodiment, the scramble circuit is configured by using the shift register that shifts bits, but this may be realized by an equivalent circuit that operates in byte units.
In addition, in this embodiment, an 8-bit primitive polynomial

[0028]

[Equation 4]

Although random seed scrambling was performed using, the polynomial used here may be any polynomial.

[0030]

[Equation 5]

On the other hand, the scramble circuit can be realized by FIG. 1 and the descramble circuit can be realized by FIG. A primitive polynomial can be used for the polynomial, so that a longer period can be taken, so that a more random sequence can be obtained. Here, a _k is 1 or 0, and when it is 1, the signal line is connected, and when it is 0, the signal line is not connected. In addition, this embodiment uses an 8-bit primitive polynomial.

[0032]

[Equation 6]

Can also be expressed as In this case, the general form of the polynomial

[0034]

[Equation 7]

On the other hand, the scramble circuit can be realized by FIG. 1 and the descramble circuit can be realized by FIG. Here, ai is 1 or 0, the signal line is connected when it is 1, and the signal line is not connected when it is 0. The relationship between equations 5 and 7 is generally called a reciprocal polynomial. Since the reciprocal polynomial of the primitive polynomial is a primitive polynomial, there is no particular problem in terms of using the primitive polynomial. Using the definition of Expression 7, it means that the output data is the quotient obtained by dividing the input data by the polynomial (here, Expression 7) that defines the scramble circuit. However, it does not matter which of the equations (5) and (7) is used.

Further, in the present embodiment, the scramble circuit 309 / descramble circuit 310 in FIG.
Is an error correction coding circuit 307 / error correction circuit 308
However, it may be provided between the run length limited encoding circuit 305 / decoding circuit 306 and the error correction encoding circuit 307 / decoding circuit 308.
4 and 7, in the present embodiment, the M-sequence generator 401/701 is replaced by the host I / F 31 from the random seed scramble circuit 403 / descramble circuit 703.
Although it is arranged on the No. 1 side, the M-sequence generator 401/701 is random seed scrambler 403 / descrambler 7
It may be arranged closer to the optical disc 301 side than 03. The scramble circuit 310 or the M-sequence generator 40 described above is used.
The arrangement of 1/701 is one embodiment, and the present invention is not limited to this. That is, the scramble circuit 3
The 10 or M-sequence generator 401/701 can be arranged at any position where the effect of the present invention can be achieved. Further, in FIG. 3, a scramble circuit 309, an error correction coding circuit 307, a run length limiting coding circuit 30 are provided.
5, descramble circuit 310, error correction circuit 30
8. It is also possible to configure all or part of the run length limited code decoding circuit 306 and the like with one chip.

Next, as a second embodiment, the random seed scrambling described in the first embodiment is applied to the next generation DV.
The application to the D format will be described in more detail. FIG. 14 is a schematic block diagram of a DVD device according to the second embodiment. Reference numeral 311 denotes an interface for controlling the input / output of data with a higher-level device, and 1406 is a microcomputer that controls the system. The microcomputer 1406
The control circuit 1411 is connected to a control circuit 1411 in the system, and the control circuit 1411 is connected to a seed generator 2603 and an error correction coding circuit 30 via a control line (not shown).
7, the scramble 2601 and the like are controlled. Reference numeral 1401 denotes an ID adder that adds additional information necessary for recording, such as an ID, to the user data provided by the interface 311, and 1402 is a memory (RAM) that temporarily stores the data. A scrambler 2601 randomizes the data.

This scrambler is the scrambler shown in FIG. 20, and includes the random seed scrambler 403 described in the first embodiment. A seed generator 2603 gives a different seed to the random seed scrambler in the scrambler 2601 each time writing is performed. Reference numeral 307 denotes an error correction coding circuit for adding an error correction code to the scrambled user data, 305
Is a coding circuit for converting the user data to which the error correction code is added into a run length limited code suitable for recording on the optical disc 301, 302 is a pickup for recording / reproducing data of the optical disc 301, 1403 is a disc rotating It is a spindle motor to make. Reference numeral 1404 is a servo that controls the optical pickup 302 and the like. Thirty
Reference numeral 4 denotes a read channel that performs waveform equalization processing, binarization, and synchronization clock generation of the analog reproduction signal read from the optical disc 301. Reference numeral 306 is a decoder for decoding the read run length limited code, 308 is an error detection / correction circuit for detecting an error based on the error correction code added by the error correction coding circuit 307 and correcting the error, 26
Reference numeral 02 denotes a descrambler circuit shown in FIG. 21 that cancels the randomization performed by the scrambler 2601 and restores the original user data. The random seed descrambler 703 described in the first embodiment is used. Including. 14
Reference numeral 07 is an ID deleter that deletes additional information necessary for recording such as an ID added by the ID adder 1401 and leaves only user data.

FIG. 19 is a diagram showing the seed generator 2603 of the second embodiment. 1301 and 1302 are both 1-bit shift registers, and 1303 is an exclusive OR circuit. The 1-bit shift register 1301 contains an appropriate value other than all zeros in the initial state. When a seed is requested when writing data, clock (1
305) is input to the 1-bit shift register 130
The value of 1, 1302 is shifted to the left. The output value of the exclusive OR circuit 1303 is input to the 1-bit shift register 1302. After that, 1-bit shift register 1
Seed value 6 bits in 301 and 1302 and I
The sector ID (sector number b7, b8) (1901) given by the D adder 1401 is the seed output line 130.
7 and is output to the scramble circuit 2601 as a seed. Here, the sector IDs b7 and b8 correspond to the 8th bit and the 9th bit from the lower order of the sector ID, and the bits that never have the same value in the adjacent tracks are selected.

The operation of the DVD device shown in FIG. 14 will be described below. First, the operation at the time of recording will be described with reference to the optical disc shown in FIG. 29, the format shown in FIG. 11 and the processing procedure at the time of recording shown in FIG. The optical disc shown in FIG. 29 has the innermost track 2
In 901, scramble mode information indicating whether or not this optical disc is compatible with random seed scramble is written. 2902, 2903, 2904, and 290 to make the scramble mode information reliable.
The same information as 5 is written in 4 places. Further, by writing in the innermost circumference as shown in this embodiment, the innermost circumference is less likely to be scratched, so that the reliability of the data can be kept high. This scramble mode information is read into the optical disc device when the optical disc device is powered on or when the optical disc is inserted, and is stored in the mode bit 2001 in the scramble circuit 2601. When different information is obtained from the four locations, the value read by majority is written in the mode bit 2001. In this embodiment,
Although the writing position of the scramble mode information is limited to only the inner circumference, it may be provided on the outer circumference or the middle track when the outer circumference or the middle track is less likely to be damaged than the inner circumference.

The tracks may be divided into a plurality of tracks such as the innermost circumference and the middle circumference. in this case,
It takes time to read the scramble mode information,
More scramble mode information can be stored with high reliability. Further, in the present embodiment, the scramble mode information is written at four positions, but it may be more. Even in that case, the scramble mode information can be stored more reliably. Further, in order to write the scramble mode information with high reliability, a strong error correction code may be added and written. In addition, if the writing position of the scramble mode information is set to an odd number, there is an advantage that the processing becomes easy because it is always decided by the majority vote. According to the present invention, it is possible to provide a disc having the above characteristics and an apparatus for recording on the disc.

First, the interfaces 311 to 204
User data 1101 of 8 bytes (for one logical sector)
Is input (step 1501). ID adder 140
1, the user data 1101 input from the interface 311 has a 4-byte error detection code (ED
C: Error Detection Code) 11
07 is added (step 1502) and written in the RAM 1402 area A 1408 (step 1503). It is confirmed whether the file is completed (step 1504), and if it is completed, the remaining sectors composed of dummy data are added so that there are 32 sectors in total (step 1517). If it is not at the end of the file, it is confirmed whether 32 sectors are complete (step 1505) and steps 1501 to 1505 are repeated until 32 sectors are prepared. If you have 32 sectors,
The ID adding circuit 1401 further includes 32 logical sectors 1101 to 1106 and EDC1 as shown in FIG.
Identification address information of data such as ID and additional information 719 bytes 1115 such as copy protection information and reserve information are added to 107 to 1112 (step 1506). Next, the mode bit 2001 is checked to determine whether the disc to be written to corresponds to random seed scrambling (step 1).
507).

If not supported, the selector 200
2 transfers unscrambled user data to the error correction detection circuit. If it supports, the scramble circuit 2601 performs scrambling. In the scramble circuit 2601, the 1-byte seed 1114 provided by the seed generator 2603 is added to the additional information 719 bytes.
It is added to the beginning of e (step 1508) and the random seed scrambling described in the first embodiment is performed (step 1509). As shown by an arrow 1116 in FIG. 11, the seed 1114, the additional information 1115, and the user data 1101 are scrambled in this order from the upper left portion and transferred to the error correction coding circuit 307.

Next, in the error correction coding circuit 307, R
1 byte stored in area A1408 in AM1402
The random seed scrambling seed 1e of e and the additional information 1115 of 719 bytes are scrambled to be [62, 30, 33] RS coded by 30 bytes and divided into 24 pieces. Error correction coding circuit 307
Then, the data of each 30 bytes is [62, 30,
33] RS1 encoded and RAM1 shown in FIG. 12
Three BIS areas 1 in area B (1409) on 402
8 codewords are stored in 005, 1006, and 1007.
Next, the logical sectors to which the EDC is added are grouped by 8 sectors each, and each of them is divided into 76 by 216 bytes. Encoding each into a [248, 216, 33] RS code,
Eight sectors are collectively shown in FIG.
It is arranged in the DC area 1001 (38 bytes × 496 bytes). Similarly, for each 8 sectors, (B) 100
The LDC areas of 2, (C) 1003 and (D) 1004 are also filled (step 1510). Further, a sync signal (SYNC code) 1008 is added to the left end (step 151).
1).

Next, the encoding circuit 305 follows the arrow 1009 indicating the recording / reproducing order shown in FIG.
Read data from the area B (1409) on the 402
4 kbytes for 31 steps (1 step for 1 byte in the vertical direction)
Minute "physical sectors" are continuously read (step 1512) and run length limited encoding is performed (step 151).
3).

The run length limited coded sequence is written on the optical disk 301 through the LD driver 1405 and the optical pickup 302 (step 1514). After that, the data is normally written on the optical disk, or the written data is read and compared with the data on the RAM (step 1515). 1 ECC normally on the optical disc 301
When the data for the block is recorded, the processing ends. However, if the recording fails for some reason during recording of the data, the same data is written in the same place, which causes deterioration of the medium. Therefore, if the disc is compatible with random seed scrambling, the seed is changed, re-scramble is performed, and data writing is performed again. That is, the process starts over from step 1507. In that case, the data stored in the area A1408 of the RAM 1402 is scrambled by the scramble 2602. The scrambled data is stored again in the RAM 1402, and the error correction coding circuit 307 adds the error correction code again. Data with error correction code added,
After being converted into a physical sector and subjected to run-length limited encoding, it is written on the optical disc 301 again.

In the case of an AV system in which speed is more important than reliability, step 1515 and the rewriting step by rescrambling can be omitted. By performing the write processing as in the present embodiment, the seed 1 byte of the random seed scramble is written in the BIS area as indicated by 1201 in FIG. Further, as in this embodiment, by using a bit which is always different between adjacent tracks in a part of the seed of the random seed scramble,
Even if scrambling is not performed by M-sequence addition using an ID or the like as a seed, it is possible to prevent the same data from being written in the adjacent track and reduce the correlation with the adjacent track. The noise from can be reduced. Although the sector IDs b7 and b8 are used in the second embodiment, any value may be used as long as it is guaranteed that the adjacent tracks have different values, and the track number or the like may be included in the ID. Alternatively, a track number or the like may be used. Current DV
Part of the ID may be used as part of the seed as a value that gives track information, as in the case of the M-series seed used in scrambling of the D-RAM.

Next, the processing procedure at the time of reproduction will be described with reference to FIG. At the time of reproduction, data is read by the optical pickup 302, and is read by the read channel 304.
Quantization and generation of synchronous clock (step 160)
1). The decoding circuit 306 decodes the run length limited code (step 1602) and reproduces the reproduced data according to the arrow 1009 shown in FIG. 12 in the area B14 of the RAM 1402.
It is temporarily stored in 09 (step 1603). 4 kbyte
16 physical sectors equivalent to e are collectively read,
It is temporarily stored in the area B1409 of the RAM 1402. The error detection / correction circuit 308 first performs error correction processing of the seed 1114 and the additional information 719 bytes 1115 such as ID stored in the BIS area shown in FIG. 12 (step 1604). Next, BI for which error correction processing was performed
The ID written in the S area is about to be reproduced E
It is confirmed whether the ID is the CC block ID (step 160).
5). If the ID is the ID of the ECC block or sector desired to be read, error correction processing of the LDC area is performed (step 1614), and the ID deleting circuit 1
At 407, the additional information 719 bytes 1115 such as ID are deleted (step 1615) and the process jumps to step 1611. I written in the BIS area after error correction processing
If D is not the ID of the ECC block to be reproduced, the data in the BIS area for which the error correction processing has been completed is transferred to the descramble circuit 2602, descrambled, and temporarily stored in the area A1408 of the RAM 1402. (Step 1606).

The present descramble circuit 2602 is shown in FIG.
As shown in FIG.
Including 3. Before inputting data in the BIS area, the 1-bit shift register 801 in the secondary descramble circuit 704 is used.
˜808 are all cleared to “0”. After the descrambling of the BIS area is completed, the values of the 1-bit shift registers 801 to 808 in the secondary descrambling circuit 704 are maintained until the descrambling of the LDC area is started. Next, the ID included in the descrambled BIS data
Confirms whether or not it is the ID of the sector desired to be read (step 1607). If the read ID is different from the desired sector ID, step 160 is performed again.
Return to 1 and read the data from the medium. Read ID
If is the ID of the desired sector, error detection /
The correction circuit 308 performs error correction processing on the user data stored in the LDC area (step 1608).
When the error correction processing is completed, the area B1 of the RAM 1402
409 to LDC area data descramble circuit 2
Transfer to 602, descramble, RAM140
It is temporarily stored in the second area A1408 (step 160).
9). Since the values of the 1-bit shift registers 801 to 808 in the descramble circuit 310 remain unchanged, the descramble processing can be continuously performed. After descrambling, the ID deleting circuit 1407 deletes the scrambling seed 1114 and the additional information 1115 such as ID from the data stored in the area A1408 of the RAM 1402 (step 1610).

After that, the EDCs 1107 to 1112 are used to confirm that the user data 1101 to 1106 have no error (step 1611), and the EDCs 1107 to 1106 are checked.
112 is deleted (step 1612) and the user data is output to the interface 311 (step 161).
3). With the configuration of the second embodiment, the scrambling is released after the error correction processing is completed, so that the error correction capability does not deteriorate due to the error propagation of the random seed scrambling. In addition, in the second embodiment, 1 ECC block is 64 Kbytes and 1 byte is 1 byte.
Although the seed of te is added, it is also possible to add the seed for every 2 Kbytes of the logical sector and perform random seed scrambling for each logical sector. Even when scrambling for each logical sector, a method of performing random seed scrambling processing using the same seed for each logical sector in one ECC block can be considered.

Further, since random seed scrambling causes error propagation, it is desirable to perform scrambling processing on the user side rather than error correction coding in consideration of saving data even if error correction is impossible. Further, as shown in the present embodiment, it is desirable that the additional information such as the ID corresponding to the user data be descrambled before the user data. By doing so, the ID can be confirmed quickly, so that re-reading can be performed quickly when the ID is incorrect. Further, as shown in the present embodiment, the ID is confirmed before the data scramble, and if the desired ID is obtained there, the data is reproduced without descrambling, and if the desired ID is not obtained. After descrambling, the ID is confirmed, and when the desired ID is obtained, the data is also descrambled and reproduced, so that the disc recorded using random seed scrambling is also recorded without using it. You can play the disc without worrying about it. Also, by using this method, even if scrambled ECC blocks and non-scrambled ECC blocks are mixed in one disc instead of in units of discs, they can be played back without concern. According to the present invention, it is possible to provide the disc and a device for reproducing the disc.

Further, in the present embodiment, the judgment is made only by the EDC check result of one logical sector. However, if the EDC check results of a plurality of logical sectors or one ECC block are all OK, the data is scrambled. You may decide not to. In this case, it is possible to reduce the probability of a determination error due to the false detection of EDC.

Next, a processing procedure for rewriting only some of the sectors in the ECC block 64 KByte will be described with reference to FIG. First, interface 3
User data 1101 of 2048 bytes (one logical sector) to be rewritten is input from 11 (step 3101). In the ID adding circuit 1401, the user data 1101 input from the interface 311 is input.
Is a 4-byte error detection code (EDC: Error)
Detection Code) 1107 is added (step 3102) and written in the area A 1408 of the RAM 1402 (step 3103). It is confirmed whether the file has ended (step 3104). If not, step 310.
Return to 1 and read the data to the end of the file. When the file ends, the data of the ECC block to be written is read from the optical disc 301 (step 310).
5). The decoding circuit 306 decodes the run length limited code (step 3106) and reproduces the reproduced data according to the arrow 1009 shown in FIG. 12 in the area B14 of the RAM 1402.
It is temporarily stored in 09 (step 3107). 4 kbyte
16 physical sectors equivalent to e are collectively read,
It is temporarily stored in the area B1409 of the RAM 1402. The error detection / correction circuit 308 first performs error correction processing of the seed 1114 and the additional information 719 bytes 1115 such as ID stored in the BIS area shown in FIG. 12 (step 3108). It is confirmed whether the ID after the error correction processing is the ID of the ECC block to be written (step 3109), and if the IDs match, the LDC
The area error correction processing is performed (step 3123), and the process proceeds to step 3114. If the IDs do not match, the data in the BIS area for which the error correction processing has been completed is transferred to the descramble circuit 2602, descrambled, and RA
It is temporarily stored in the area A1408 of M1402. (Step 3110). Before the data input to the BIS area, the 1-bit shift register 8 in the secondary descramble circuit 704 is
All of 01 to 808 are cleared to "0".

After descrambling the BIS area, LD
1-bit shift registers 801 to 808 in the secondary descrambling circuit 704 until the descrambling of the C area is started.
The value of is retained. Next, it is confirmed whether the ID included in the descrambled BIS data is the ID of the sector desired to be written (step 3111). If the read ID is different from the desired sector ID, the process returns to step 3105 again to read the data from the medium. If the read ID is the ID of the desired sector, the error detection / correction circuit 308 outputs the LD
Error correction processing is performed on the user data stored in the C area (step 3112). When the error correction process is completed, R
The data in the LDC area is transferred from the area B1409 of the AM1402 to the descramble circuit 310 and is descrambled (step 3113), and only the sectors not written in step 3103 are temporarily stored in the area A1408 of the RAM1402 (step 3114).

This completes the data for one ECC block to be written. Next scramble circuit 2
In step 601, first, it is checked whether the inserted disc is a scramble compatible disc (step 3115),
If it is not a scramble compatible disc, step 3118
Proceed to. If the disc supports scrambling, random seed scrambling is performed. A 1-byte random seed scrambling seed 1114 provided by the seed generator 2603 is added (step 3116) and scrambled (step 3117). Arrow 1 in FIG.
As shown at 116, the seed 1114,
The additional information 1115 and the user data 1101 are scrambled in this order and transferred to the error correction coding circuit 307.

Next, in the error correction coding circuit 307, R
1 byte stored in area A1408 in AM1402
The random seed scrambling seed 1e of e and the additional information 1115 of 719 bytes are scrambled to be [62, 30, 33] RS coded by 30 bytes and divided into 24 pieces. Error correction coding circuit 307
Then, the data of each 30 bytes is [62, 30,
33] RS1 encoded and RAM1 shown in FIG. 12
3 BIS areas 100 in area B 1409 on 402
8 code words are stored in 5, 1006 and 1007. Next, the logical sectors to which the EDC is added are grouped by 8 sectors each, and each of them is divided into 76 by 216 bytes. Each is encoded into a [248, 216, 33] RS code, and 8
LD of (A) shown in FIG. 12 collectively for sectors
It is arranged in the C area 1001 (38 bytes × 496 bytes). Similarly, for each 8 sectors, (B) 1002
The LDC areas of (C) 1003 and (D) 1004 are also filled (step 3118).

Next, the encoding circuit 305 follows the arrow 1009 indicating the recording / reproducing order shown in FIG.
Data is read from the area B on the 402, and 31 columns (1 column is one byte in the vertical direction) are continuously read as 4 kbytes of "physical sector" (step 3119).
Run length limited coding is performed (step 3120). The run-length limited encoded data of 4 kbytes passes through the LD driver 1405 and the optical pickup 302, and then the optical disc 3
01 (step 3121). Similarly, for the remaining error-correction-coded data, 4 kby
Each "physical sector" of te unit is processed and written on the optical disc. After that, the data is normally written on the optical disk, or the written data is read and compared with the data on the RAM (step 3122). When one ECC block worth of data is normally recorded on the optical disc 301, the process ends. However, if the recording fails for some reason during recording of the data, the same data is written in the same place, which causes deterioration of the medium. Therefore, if the disc is compatible with random seed scrambling, the seed is changed, re-scramble is performed, and data writing is performed again.

That is, the process is restarted from step 3115. In that case, the data stored in the area A of the RAM 1402 is scrambled by the scramble 2602.
The scrambled data is an error correction coding circuit 30.
At 7, the error correction code is added again. The data to which the error correction code has been added is converted into a physical sector, subjected to run length limitation coding, and then written to the optical disc 301 again. It should be noted that AV where speed is more important than reliability
In the case of a system, the step 3122 and the re-scramble rewriting step may be omitted.

Next, FIG. 28 and FIG. 3 for the third embodiment.
This will be described with reference to 0. FIG. 30 shows an optical disk medium 301 used in the third embodiment. 3001 is
The innermost track of the optical disc 301, 3001
The number of rewrites of each ECC block is recorded in 3002 to 3002. The optical disc 301 of the third embodiment is written according to the format shown in FIG. 22, and has innermost tracks 3001 to 30.
02 is also written according to the format shown in FIG. Also in this embodiment, the reliability of the rewriting number recording area is improved by providing the rewriting number recording area in the innermost circumference. In the format shown in FIG. 22, as shown in FIG. 11, 32 logical sectors (32 * 2
048 bytes of data can be stored. This 32 *
2048 bytes are divided into a size of 17 bits each and used as a rewrite count recording area. This 17-bit rewrite count recording area is an EC for data recording of the entire disc.
One for each C block, preferably about 1
It is possible to count up to 30,000 rewrites. When the optical disc is shipped from the factory, 1 is written as the number of rewrites. 30840 in one ECC block
Data of individual ECC blocks can be managed. 22.5G
12ECC to manage a byte optical disc
A block rewrite count recording area is required. Tracks from the innermost track 3001 to 12 ECC blocks (up to the track 3002) are prepared as a rewrite count recording area.

FIG. 28 shows the DV in the third embodiment.
It is a schematic block diagram of a D device. Reference numeral 311 denotes an interface for controlling input / output of data with a host device, 1406.
Is a microcomputer that controls the system. Microcomputer 140
6 is connected to a control circuit 1411 in the system, and the control circuit 1411 is provided with an error correction coding circuit 307 and a scrambler 2 via a control line (not shown).
601 and the like are controlled. In the microcomputer 1406, there is an information bit 2805 which indicates whether or not the currently inserted optical disk is compatible with random seed scrambling in which the number of rewrites is part of the seed. 1401 shows the user data given by the interface 311
ID to add additional information required for recording such as ID
An adder 1402 is a memory (RAM) for temporarily storing data. 2601 is a scrambler for randomizing data, and this scrambler
As described in the first embodiment, the fixed seed M
It includes a sequence generator and a random seed scrambler. Reference numeral 307 denotes an error correction coding circuit that adds an error correction code to the scrambled user data, and 305 denotes the optical disk 30 that stores the user data to which the error correction code has been added.
1 is a coding circuit for converting into a run length limited code suitable for recording on the optical disc 1, 302 is a pickup for recording / reproducing data of the optical disc 301, and 1403 is a spindle motor for rotating the disc. Reference numeral 1404 is a servo that controls the optical pickup 302 and the like. 304 is
This is a read channel that performs waveform equalization processing, binarization, and synchronization clock generation of the analog reproduction signal read from the optical disc 301. Reference numeral 306 is a decoder for decoding the read run length limited code, 308 is an error detection / correction circuit for detecting an error based on the error correction code added by the error correction coding circuit 307 and correcting the error, 310 removes the randomization performed by the scrambler 309,
The descramble circuit shown in the first embodiment for returning to the original user data includes a fixed seed M sequence generator and a random seed descrambler. 140
An ID deleter 7 deletes additional information necessary for recording such as an ID added by the ID adder 1401 and leaves only user data.

The memory 2604, as shown in FIG.
A memory 2301 for recording the number of rewrites read from the tracks 3001 to 3002 of the optical disc 301;
It is composed of a bit register 2302 and an inverter 2303. When a seed for random seed scrambling is requested when writing data, CLOCK2304
Is input and the value of the 1-bit register 2302 is inverted. 8 of the lower 7 bits of the rewrite count of the ECC block to be written, which is recorded in the rewrite count recording memory 2301, and the value of the 1-bit register 2302 are combined.
The bits are output to the scramble circuit 2601 as a seed of random seed scrambling.

Next, in the third embodiment, rescramble is performed using the second seed in order to obtain a preferable run length limited code sequence. When the seed for re-scramble is requested, the CLOCK 2304 is input again and the value of the 1-bit register 2302 is inverted. The lower 7 bits of the number of rewrites of the ECC block to be written and the value of the 1-bit register 2302 recorded in the rewrite count recording memory 2301 are output to the scramble circuit 2601 as a seed of the random seed scramble. Only the lower 1 bit of the first seed and the second seed given first is inverted. Note that this seed generator is only an example, and the shift register 2302 may have two bits or more so that four or more seeds can be selected per writing.

The operation of the optical disk device shown in FIG. 28 will be described below. First, the operation when the power is turned on or when the optical disc is inserted will be described with reference to FIG. First, when the optical disk device is powered on (step 3201), the optical disk device 2801 confirms whether the optical disk 301 is in the device (step 3202). If it is not inserted, step 3202 is repeated until the optical disk 301 is inserted. When the optical disk is inserted (step 3203), the rewriting frequency recording area (track 3001 to track 300) is recorded.
The rewrite frequency information of the ECC block of the entire disk written in 2) is read (step 3204). First, run length limited code decoding is performed (step 3205), and RAM1
It stores in 402 (step 3206). The error in the BIS area is corrected (step 3207), and the ID written in the BIS area is confirmed (step 3208). In the third embodiment, since the BIS area is not scrambled, descramble processing is not performed.

If the ID is in the rewrite count recording area, error correction is performed in the LDC area (step 320).
9), error detection by EDC is performed (step 321).
0). If no error is detected by the EDC, it means that the inserted optical disk does not support random seed scrambling in which the number of times of rewriting is part of the seed, so the information bit 2805 is reset (step 3217) and the processing ends. If the EDC detects an error, it descrambles the data (step 3
211), the error detection by EDC is performed again (step 3212). If an error is detected by the EDC, start over from step 3204. If no error is detected by the EDC, the added seed, ID information, etc. are deleted (step 3213), the EDC is deleted (step 3214), and the information bit 2805 is set (step 3215). Data of the number of rewrites is stored in the memory 2604 (step 3216). Power O
The operation at the time of N or at the time of inserting the disk is ended, and the command is given from the host interface.

Next, the operation at the time of recording will be described with reference to the format shown in FIG. 22 and the processing procedure at the time of recording shown in FIGS. 33, 34 and 24.

First, as shown in FIG. 33, when information about a sector to be written is given from the interface 311, the ID addition circuit 1401 outputs identification address information of data such as ID, copy protect information and reserve information. The additional information is generated and input to the error correction coding circuit 307, and the RAM 140
The data is stored in the storage locations in the BIS areas of the area A2802 and the area B2803 above (step 3301). Area A2802 and area B2803 are respectively shown in FIG.
It is divided to store data as shown in
The additional information is stored in the BIS area indicated by 1005, 1006, and 1007. In the BIS area, a seed storage area 2 for storing seeds for random seed scrambling
201 is provided, and it is made so that a 1-byte seed can be stored in 2 physical blocks. Next, referring to the information bit 2805 (step 3302), if the optical disk to be currently written does not support random seed scrambling, step 24 in FIG.
01, after reading 32 sectors of user data from the interface 311, the first by fixed seed
Next scrambling is performed (step 2402), error correction coding is performed (step 2403), and then RAM 1402.
(Step 2404), a sync signal is added (step 2405), run length limited encoding is performed (step 2406), and the data is written to the optical disc 301 via the LD driver 1405 and the optical pickup 302 (step 2407).

After that, the data is normally written on the optical disk, or the written data is read and compared with the data on the RAM (step 2408). When one ECC block worth of data is normally recorded on the optical disc 301, the process ends. However, if the recording fails for some reason while recording the data, the process starts over from step 2406. In other words, the data on the RAM 1402 is converted into the run length limited code, and the process is started again.

Information bit 2805 is set,
If the optical disc 301 currently being written is compatible with random seed scrambling, first, the number of rewrites corresponding to the ECC block to be written is read from the memory 2604 (step 3303), and “1” is added to the number of rewrites to add to the memory. It is stored in 2604 (step 3304). At this time, if the number of rewrites exceeds a certain value, for example, 80,000, the replacement process is performed with a different physical sector in anticipation that the reliability will be lowered due to the deterioration of the medium. Therefore, the alternative sector process (step 3308) is performed, the process returns to step 3301 again, and ID
Re-attach the recording process. If the number of rewrites is less than a certain value, the interfaces 311 to 32
User data for the logical sector is read (step 33)
06), first sent to the scramble circuit 2601, where the ID
First-order scrambling is performed by adding M sequences by a fixed seed using a part of the above (step 3307). The processes after step 3309 are performed every two physical blocks. One physical block corresponds to 31 rows (one row corresponds to one byte in the vertical direction) in FIG.

First, the case of processing the first two physical blocks will be described. A first seed composed of the lower 7 bits of the number of rewrites obtained by adding “1” and the output of the 1-bit register 2302 is used as an area A2802 on the RAM 1402.
It is stored in one of the seeds 2201 shown in FIG. 22, that is, the seed (top seed) in the physical block currently being processed (step 3309). Next, the error correction coding circuit 307 performs [62, 30, 33] RS coding on the data of the BIS area in the first two physical blocks currently being processed (step 3310). Next, the shift register of the random seed scramble circuit is set with the first seed (step 3311). Random seed scrambles the user data for the first two physical blocks. At this time, random seed scrambling is performed in the order of the arrow 1009 in the recording / reproducing order shown in FIG. 22 (step 331).
2). If the physical block being processed is the 7th, 8th sector or the 15th, 16th sector (step 331)
3), since the user data is only halfway [248,
216, 33] encoded into RS code (step 331
4), write to area A2802 on RAM 1402 (step 3315). Add a sync signal (step 3
316) and run length limited encoding (step 331).
7).

Next, the second seed in which only the lower 1 bit is inverted with respect to the first seed is set to the area B on the RAM 1402.
The data is stored in one of the seeds 2201 shown in FIG. 22 in 2803, the seed (top seed) in the physical block being processed (step 3318). Next, the data in the BIS area in the first two physical blocks currently being processed is subjected to [62, 30, 3 by the error correction coding circuit 307.
3] RS coding is performed (step 3319). Next, the shift register of the random seed scramble circuit is set with the second seed (step 3320). Random seed scrambles the user data for the first two physical blocks. At this time, the arrow 1 in the recording / reproducing order shown in FIG.
Random seed scrambling is performed in the order of 009 (step 3321). The physical block that is processing is
In the case of the 7th, 8th sector or the 15th, 16th sector (step 3322), since the user data is only halfway,
[248, 216, 33] Encodes into RS code (step 3323) and writes in area B2803 on RAM 1402 (step 3324). A sync signal is added (step 3325) and run length limited coding is performed (step 332).
6). Made in steps 3317 and 3326
Of the two sequences on the run length limited code, the one with the better property is selected (step 3327), and the LD driver 14 is selected.
05, write on the optical disc 301 via the optical pickup 302 (step 3328).

Here, as a method of selecting a sequence having good characteristics, (1) a sequence having a small maximum mark and maximum space is selected. (2) Select a code having a low low-frequency component. (3) Various methods are conceivable, such as selecting the smallest mark or smallest space with a low frequency of occurrence.

Next, if the selected sequence is generated from the second seed, the seed and the random seed scrambled sequence are stored in the RAM 14
No. 02 area B2803 to area A2802. If the selected sequence is generated from the first seed, the seed and the random seed scrambled sequence are stored in the area A on the RAM 1402.
2802 to area B2803. (Step 332
9). Repeat until one ECC block is completed (step 3330). After the completion of one ECC block, the data is normally written on the optical disk or the written data is read and compared with the data on the RAM (step 3331). 1 ECC normally on the optical disc 301
When the data for the block is recorded, the processing ends.

However, if the recording fails for some reason during recording of the data, the same data is written in the same place, which causes deterioration of the medium. Therefore, in this case, the seed is changed, re-scramble is performed, and data writing is performed again. That is, the processing shown in FIG. 34 is performed. First, the number of times of rewriting of the corresponding ECC block stored in the memory 2604 is read (step 3401), "1" is added to the number of times of rewriting, and the result is stored in the memory 2604 (step 3402). Lower 7 bits of rewriting and 1
The first seed formed by the output of the bit register 2302 is stored in one of the seeds 2201 shown in FIG. 22 in the area A2802 on the RAM 1402, that is, the seed (top seed) in the physical block being processed. (Step 3403). At this time, since the number of rewrites is incremented by 1, the seed is always different from the seed at the first time. Next, the data in the BIS area in the first two physical blocks currently being processed is processed by the error correction coding circuit 30.
In step 7, RS coding is performed on [62, 30, 33] (step 3404). Next, the random seed scrambled data for the first two physical blocks stored in the area A2802 on the RAM 1402 is descrambled (step 3405).

Next, the shift register of the random seed scramble circuit is set with the first seed (step 3).
406). Next, the descrambled user data is randomly seed scrambled. At this time, random seed scrambling is performed in the order of the arrow 1009 in the recording / reproducing order shown in FIG. 22 (step 3407). The physical block being processed is the 7th or 8th sector or 15, 16
In the case of the sector (step 3408), since the user data is only halfway, it is encoded into [248, 216, 33] RS code (step 3409) and written in the area A2802 on the RAM 1402 (step 3410). A sync signal is added (step 3411) and run length limited coding is performed (step 3412). Next, the second seed in which only the lower 1 bit is inverted with respect to the first seed is set in the RAM 14
Seed 220 shown in FIG. 22 in the area B2803 on 02.
One of them is stored in the seed (top seed) in the physical block being processed (step 341).
3).

Next, the data in the BIS area in the first two physical blocks currently being processed is processed by the error correction coding circuit 30.
7, the [62, 30, 33] RS coding is performed (step 3414). Next, the shift register of the random seed scramble circuit is set with the second seed (step 3).
415). Random seed scrambling is performed on the user data obtained in step 3405. At this time, random seed scrambling is performed in the order of the arrows in the recording / reproducing order shown in FIG. 22 (step 3416). When the physical block being processed is the 7th, 8th sector or the 15th, 16th sector (step 3417), since the user data is only halfway, it is encoded into the [248, 216, 33] RS code (step 3418). ), Area B on RAM 1402
2803 (step 3419). A sync signal is added (step 3420) and run length limited coding is performed (step 3421). Step 3412 and Step 3
Of the sequences on the two run length limited codes created in 421, the one with the better property is selected (step 3422),
Writing is performed on the optical disc 301 through the LD driver 1405 and the optical pickup 302 (step 3423).

Next, if the selected sequence is generated from the second seed, the seed and the random seed scrambled sequence are stored in the RAM 14
No. 02 area B2803 to area A2802. If the selected sequence is generated from the first seed, the seed and the random seed scrambled sequence are stored in the area A on the RAM 1402.
2802 to area B2803 (step 342)
4). Repeat until one ECC block is completed (step 3425). When one ECC block is completed, data is normally written on the optical disk, or the written data is read and compared with the data on the RAM (step 3426). 1 ECC normally on the optical disc 301
When the data for the block is recorded, the processing ends.

Next, the operation at the time of reproduction will be described with reference to the processing procedure of FIG. First, the optical disc device 28
01 reads data from the optical disk (step 25)
01). First, run length limited code decoding is performed (step 250).
2) and store it in RAM 1402 (step 250)
3). Error correction in the BIS area is performed (step 250
4) Confirm the ID written in the BIS area (step 2505). In the third embodiment, the BIS
Since the area is not scrambled, no descramble processing is performed. ECC whose ID was in the read request
If it is a block, error correction is performed in the LDC area (step 2506), and error detection by EDC is performed (step 2507). If no error is detected by the EDC, proceed to step 2510. If an error is detected by the EDC, the data is descrambled (step 2508) and the error is detected again by the EDC (step 2509). If the EDC detects an error, the process starts over from step 2501. ED
If no error is detected by C, the added seed, ID information, etc. are deleted (step 251).
0), EDC is deleted (step 2511), and the decrypted user data is output from the interface 311 (step 2512). By controlling in this way, even if a random seed scrambled area and a non-random seed scrambled area coexist on one disc, it is easy to read without providing a special bit on the format that indicates that. It can be carried out.

Next, the operation when the power is turned off and the optical disk is taken out will be described with reference to the processing procedure shown in FIG. When a power-off command or an optical disk eject command is issued, the optical disk device 2801 first refers to the information bit 2805 (step 3603), and if the information bit 2805 is cleared, it proceeds to step 36.
Proceed to 06. When the information bit 2805 is set, the data in the memory 2604 is read (step 3604) and the rewrite count corresponding to the rewrite count recording area is all incremented by 1 (step 3605). After that, the number of rewrites stored in the memory 2604 is written in the tracks 3001 to 3002 of the disc 301 according to the write sequence from step 3307 of the write sequence of FIG. 33 (step 3606), and then the optical disc is taken out and the power is turned off ( Step 3606).

A technique for producing a disc having a sequence with good characteristics by selecting one having a good sequence characteristic after generating a plurality of RLL sequences as shown in the third embodiment is as follows. This is especially effective in a ROM disk creation device. The ROM disk creation device can also be configured similarly to the third embodiment.

Further, according to the third embodiment, a run length code sequence with better characteristics can be obtained by selecting from a plurality of sequences.

Next, a fourth embodiment will be described with reference to FIGS. 18 and 13. FIG. 18 is a schematic block diagram of the optical disk device 2801 shown in the fourth embodiment. Reference numeral 311 denotes an interface for controlling the input / output of data with a higher-level device, and 1406 is a microcomputer that controls the system. The microcomputer 1406 is connected to the control circuit 1411 in the system, and the control circuit 1411 is connected to the seed generator 2 via a control line (not shown).
603, error correction coding circuit 307, scramble 2
601 and the like are controlled. 1401 is the interface 31
An ID adder for adding additional information necessary for recording, such as an ID, to the user data given by 1.
Reference numeral 07 is an error correction coding circuit for adding an error correction code to user data, and 1402 is a memory (RAM) for temporarily storing data. 2601 is a scrambler for randomizing data, and this scrambler
As described in the first embodiment, the fixed seed M
It includes a sequence generator and a random seed scrambler. Reference numeral 305 is an encoding circuit for converting the scrambled user data into a run length limited code suitable for recording on the optical disc 301, 302 is a pickup for recording / reproducing data on the optical disc 301, and 1403 is a spindle for rotating the disc. It is a motor.

Reference numeral 1404 is a servo for controlling the optical pickup 302 and the like. 304 is an optical disk 30
Waveform equalization processing of the analog reproduction signal read from 1.
This is a read channel that performs binarization and synchronous clock generation. Reference numeral 306 is a decoder for decoding the read run length limited code, and 310 is the demodulator shown in the first embodiment in which the randomization performed by the scrambler 309 is released and the original user data is restored. A scramble circuit including a fixed-seed M sequence generator and a random seed descrambler. Reference numeral 308 is an error detection / correction circuit that detects an error based on the error correction code added by the error correction coding circuit 307 and corrects the error. Reference numeral 1407 is necessary for recording the ID added by the ID adder 1401. It is an ID deleter that deletes additional information and makes only user data. A seed generator 2603 generates a new seed and gives it to the scrambler 309 each time the writing process is performed.

The operation of the optical disk device shown in FIG. 18 will be described below with reference to FIG. First, at the time of recording, additional information necessary for recording such as an ID is added to the user data input from the host interface 311 by the ID adder 1401. After that, the error correction coding circuit 307 performs error correction coding, and the RAM 140
2 is stored in the format shown in FIG. 12 according to the format shown in FIG. The optical disc 3 is scrambled and run length limited encoded by the run length limited encoding circuit 305.
Write to 01. After that, it is read and confirmed whether the data can be normally written on the optical disc. If the data has not been normally written, the data stored in the RAM 1402 is again scrambled using the fixed seed, the seed is changed, and the random seed scramble is performed, and the run length limited encoding circuit 305 is executed. It is run length limited and encoded on the optical disc 301. When writing on the optical disc, the writing is performed according to the format shown in FIG. That is, gap 370 that absorbs the deviation of the write start timing subsequent to the Header 3702 and Mirror 3703 formed on the optical disk for sector generation.
4, Guard 3705, VFO area 3706 for generating reproduced clock, PS3 for byte synchronization
After 707, the seed 1 byte 37 after scramble
08 is written.

After that, the user data is written according to the format shown in FIG. As the storage location of the seed, the BIS areas 1005 and 100 shown in FIG.
It may be embedded in an unused area of 6, 1007. Next, the operation during reproduction will be described. At the time of reproduction, first, the data read from the optical disc is decoded by the run length limited code decoding circuit at 306, and the seed is read at the data head position 3708 or the BIS areas 1005 and 1006.
The data is extracted from 1007, the random seed descramble and the fixed seed scramble are descrambled by the descramble circuit 310, and stored in the RAM 1402 (step 3206). The error correction circuit 308 performs error correction processing, deletes the added ID information, etc., and outputs it to the host interface.

By placing the random seed scramble on the medium side of the error correction circuit as shown in this embodiment, the error correction coding process can be omitted in the rewriting process, so that the rewriting process can be executed at high speed.

Next, a fifth embodiment will be described with reference to FIG. The fifth, sixth, and seventh embodiments are the existing optical disc control L that incorporates an error correction coding circuit and the like.
A method of applying random seed scrambling to an optical disk device controlled by SI will be described. First,
In the fifth embodiment, the scramble LSI 2605 that performs random seed scramble processing is placed closer to the host interface than the optical disc control LSI 2611. The scramble LSI 2605 includes a scramble circuit 2607, a descramble circuit 260, which performs data input / output control with a host computer.
9. An interface circuit 2608 which outputs a signal similar to that of the interface circuit of the host computer and controls data input / output with the interface circuit 311 on the optical disk control LSI 2611 is included. Seed generator 2
613, the scramble circuit 2607, and the descramble circuit 2609 are the same as those described in the second embodiment. Further, the microcomputer 1406 uses the scramble LS
Connected to the control circuit 2614 in I2605,
The control circuit 2614 controls the seed generator 2613, the scramble 2607, etc. via a control line (not shown).

Next, the recording operation will be described. First, when the interface 311 gives information such as the data size of the sector to be written and the ID of the recording location, the interface 2608 causes
The information given to the optical disc control LSI 2611 is transmitted as it is. Then from interface 2610, first
Upon receiving the user data for one logical sector (2048 bytes) of, the seed generator 2613 generates a new seed and passes it to the scramble circuit 2607. In the scramble circuit 2607, a seed is added to the head of the user data for one logical sector, and scrambling is performed. The first 1 byte of the sequence after scramble is the microcomputer 14
The sequence after being read by 06 and scrambled by 2048 bytes is transferred to the optical disc control LSI 2611 through the interface 2608. Next, when the user data for the second logical sector (2048 bytes) is received, if the logical sector is the data to be written in the same ECC block as the first logical sector in the previous period, the seed generator 2613 generates a new seed. do not do.

If the logical sector is data to be written in an ECC block different from the first logical sector, the seed generator 2613 generates a new seed. In this way, one ECC block worth of user data is read. In the optical disc control LSI 2611, the ID adding circuit 1401 generates identification information of data such as ID and additional information 720 bytes such as copy protect information and reserve information from the previous sector information, and stores it in the RAM.
It writes in 1402 in the format shown in FIG. Figure 1
3 BIS areas 1005, 1006, 100 shown in 2
Write to 7. The microcomputer 1406 writes the first 1 byte of the scrambled sequence just read into the reserved area written in the fixed value of the additional information 720 bytes in the BIS areas 1005, 1006, 1007 on the RAM 1402. Microcomputer 1406
Additional information 720 including 1 byte written by
Divide 30 bytes into 24 bytes. The error correction coding circuit 307 performs [62, 30, 33] RS coding on the data of 30 bytes each, and three BIS areas 100 on the RAM 1402 shown in FIG.
8 code words are stored in 5, 1006 and 1007.

Next, from the interface 311, 204
User data 1101 of 8 bytes (for one logical sector)
Read. In the ID adder 1401, a 4-byte error detection code (EDC: Error Detectio) is added to the user data input from the interface 311.
n Code) and store it in the RAM 1402.
Next, it transfers it to the error correction coding circuit 307,
6 bytes each [248, 216, 33] RS (Reed
RAM shown in FIG. 12 after being encoded into the Solomon code.
Four LDC regions 1001, 1002, 1 on 1402
003 and 1004. When the user data for one ECC block is read and error correction coded, a sync signal (SYNC code) 1008 is added to the left end. Next, the encoding circuit 305 reads data from the RAM 1402 according to the arrow 1009 indicating the recording / reproducing order shown in FIG. 12, and 31 stages (1 stage is one byte in the vertical direction) of 4 kbytes of “physical sector”. Is continuously read and run length limited encoding is performed. The data for 4 kbytes coded by the run length limitation is stored in the LD driver 140.
5, the data is written on the optical disk 301 via the optical pickup 302.

Next, a processing procedure at the time of reproduction will be described.
At the time of reproduction, the optical pickup 302 reads data, and the read channel 304 performs binarization and synchronization clock generation. The decoding circuit 306 decodes the run length limited code, and temporarily stores the reproduced data in the RAM 1402 according to the arrow 1009 shown in FIG. In the error detection / correction circuit 308, first, additional information 720 by such as an ID including the first 1 byte of the scrambled sequence stored in the BIS area shown in FIG.
te error correction processing is performed. Next, it is confirmed whether the ID written in the BIS area where the error correction processing is performed is the ID of the ECC block to be reproduced. Where I
If D is the ID of the ECC block or sector desired to be read, the microcomputer 1406 first reads the first 1 of the scrambled sequence stored in the BIS area.
Read the byte, and the R in which the 1 byte was stored
The data on AM is returned to the fixed value of the reserve area. Then, error correction processing is performed on the LDC area, and the ID deletion circuit 14
In 07, the additional information 720 bytes such as ID is deleted, and E
After checking the error using DC, the user data 2048 bytes are transferred to the interfaces 311 and 2608.
And is transferred to the descramble circuit 2609. The microcomputer 1406 adds the first 1 byte of the scrambled sequence read from the BIS area to the head of the user data 2048 bytes and performs descrambling. The descrambled sequence is transferred from the interface 2610 to the host computer.

With the configuration of the fifth embodiment, the scrambling is released after the error correction processing is completed, so that the error correction capability does not deteriorate due to the error propagation of the random seed scrambling. Further, in the fifth embodiment, in each ECC block, each logical sector uses the same seed for random seed scrambling, but one ECC block 64 Kbytes may be scrambled continuously. A method of performing random seed scrambling using a different seed for each logical sector can be considered. In this case, 32b is set as an area for storing the first byte after scrambling in the BIS area.
It is necessary to secure the yte area.

Further, since random seed scrambling causes error propagation, it is desirable to perform scrambling processing on the user side rather than error correction coding in consideration of recovering data even if error correction is impossible.

Next, a sixth embodiment will be described with reference to FIG. In the sixth embodiment, a scramble LSI 27 that performs random seed scramble processing.
01 is placed closer to the optical disk medium than the optical disk control LSI 2611. The scramble LSI 2701 includes run length limited code decoding circuits 2704 and 2706, coding circuits 2702 and 2705, and a scramble circuit 270.
3, descramble circuit 2707, seed generator 270
Including 8. The scramble circuit 2703 and the descramble circuit 2707 are the same as those described in the third embodiment. The seed generator is the same as that described in the second embodiment.

Next, the recording operation will be described. First, when information about the sector to be written is given from the interface 311, the optical disc control LSI
In 2611, the ID adding circuit 1401 generates identification address information of data such as ID and additional information 720 bytes such as copy protect information and reserve information from the information on the previous sector, and the RAM 1402 stores the additional information 720 bytes.
Write in the format shown in 2. Data is written in the three BIS areas 1005, 1006, 1007 shown in FIG.
Additional information 720byte generated by the ID adding circuit 1401
e is encoded by [62, 30, 33] RS by 30 bytes and divided into 24 pieces. In the error correction coding circuit 307, the data of each 30 bytes is [62, 30, 3
3] The RAM 14 which is RS encoded and shown in FIG.
02 on three BIS areas 1005, 1006, 100
8 code words are stored in 7.

Next, the interface 311 to 204
User data 1101 of 8 bytes (for one logical sector)
Read. In the ID adder 1401, a 4-byte error detection code (EDC: Error Detectio) is added to the user data input from the interface 311.
n Code) and store it in the RAM 1402.
Next, it transfers it to the error correction coding circuit 307,
It is encoded into a [248, 216, 33] RS code by 6 bytes and stored in four LDC areas 1001, 1002, 1003, 1004 on the RAM 1402 shown in FIG. After the user data for one ECC block is read and error correction coded, the sync signal (SYN
C code) 1008 is added.

Next, the encoding circuit 305 follows the RAM 1 according to the arrow 1009 indicating the recording / reproducing order shown in FIG.
The data is read from the 402, and 31 steps (1 step in the vertical direction
One byte) is continuously read as 4 kbytes of "physical sector" and run length limited encoded. The data for 4 kbytes, which has been run length limited encoded, is transferred to the scramble LSI 2701. Scramble LSI2
In 701, the run length limited encoded data of 4 kbytes is returned to user data by the decoding circuit 2704. The 1-byte seed generated by the seed generator 2708 is B
It is embedded in the reserve area of the IS area and used as a preset value of the random seed scrambler. The decoded user data is scrambled by the scrambler 2703 and then run-length limited coded again by the coding circuit 2702. The data is written on the optical disc 301 via the LD driver 1405 and the optical pickup 302.

Next, the processing procedure at the time of reproduction will be described.
At the time of reproduction, the optical pickup 302 reads data, and the read channel 304 performs binarization and synchronization clock generation. The decoding circuit 2706 decodes the run length limited code and extracts the seed embedded in the BIS area. The extracted seed is used as a preset value of the random seed descrambler in the descramble circuit 2707. The descrambled sequence is run-length limited coded again by the coding circuit 2705 and sent to the optical disc control LSI 2611. The optical disc control LSI 2611 decodes the run length limiting code again, and temporarily stores the reproduced data in the RAM 1402 according to the arrow 1009 shown in FIG. In the error detection / correction circuit 308, first, error correction processing is performed on the additional information 720 bytes such as ID stored in the BIS area shown in FIG. Next, it is confirmed whether the ID written in the BIS area where the error correction processing is performed is the ID of the ECC block to be reproduced.

Here, the ID whose ID is desired to be read
If the ID is a CC block or sector, error correction processing is performed on the LDC area, the ID deletion circuit 1407 deletes the additional information 719 bytes such as the ID, and the EDC is used to check the error of the user data 2048 bytes. After that, the user data 2048 bytes are transferred to the host computer via the interface 311. With the configuration of the sixth embodiment as described above, random seed scrambling can be applied by adding the scramble LSI 2701 to the existing optical disc control LSI 2611.

Next, a seventh embodiment will be described with reference to FIG. In the seventh embodiment, the random seed scramble process is processed by the microcomputer 1406 as software.

Next, the operation during recording will be described. First, when information about the sector to be written is given from the interface 311, the optical disc control LSI
In 2611, the ID adding circuit 1401 generates identification address information of data such as ID and additional information 720 bytes such as copy protect information and reserve information from the information about the previous sector. The microcomputer 1406 determines the seed by performing the operation shown in the equation 8.

[0101]

[Equation 8]

Here, k indicates the k-th seed generation. n is a number that is sparse to the appropriate 256. The 1-byte seed generated by the microcomputer 1406 is sent to the ID addition circuit 1401 through the control line 3801.
It is written in the reserve area in the 720 bytes generated in. 720 bytes are divided into 24 pieces of 30 bytes each. In the error correction coding circuit 307, this 3
Data of each 0 byte is [62, 30, 33] RS encoded, and each of them is stored in the RAM 1402 shown in FIG.
Eight code words are stored in each of the BIS areas 1005, 1006, and 1007.

Next, from the interface 311, 204
User data 1101 of 8 bytes (for one logical sector)
Read. In the ID adder 1401, a 4-byte error detection code (EDC: Error Detectio) is added to the user data input from the interface 311.
n Code) and store it in the RAM 1402.
Next, the microcomputer 1406 scrambles the data stored in the RAM by performing the operation represented by Formula 2 through the control line 3802.

[0104]

[Equation 2]

In this operation, bi is read i
This is the th user data. The data is read from the head of the user data on the RAM 1402 one bit at a time, and b
Calculation is performed by substituting i. ci is the i-th operation result and is a value after scramble. The microcomputer 1406 writes the value of ci in the RAM. The 1-byte seed generated by the microcomputer is used as the initial value of c-7 to c0 in calculating the equation 2.

When the scrambling by the microcomputer 1406 is completed, the scrambling is transferred to the error correction coding circuit 307, which is 216 bytes at a time [248, 216, 33] RS (R
edSolomon) code, and four LDC areas 1001 and 100 on the RAM 1402 shown in FIG.
2, 1003, 1004. When the user data for one ECC block is read and error correction coded, a sync signal (SYNC code) 1008 is added to the left end. Next, the encoding circuit 305 follows the RAM 14 according to the arrow 1009 indicating the recording / reproducing order shown in FIG.
Data is read from the area B 1409 on 02, 31 stages (1 stage is one byte in the vertical direction) are continuously read as 4 kbytes of "physical sector", and run length limited encoding is performed. The data for 4 kbytes encoded by the run length limiting code is the LD driver 1405 and the optical pickup 302.
Then, the data is written on the optical disc 301.

Next, a processing procedure at the time of reproduction will be described.
At the time of reproduction, the optical pickup 302 reads data, and the read channel 304 performs binarization and synchronization clock generation. The decoding circuit 306 decodes the run length limited code. The reproduced data is temporarily stored in the RAM 1402 according to the arrow 1009 shown in FIG. In the error detection / correction circuit 308, the BI shown in FIG.
Error correction processing is performed on the additional information 720 bytes such as ID stored in the S area. Next, BIS that has undergone error correction processing
The ID written in the area is the EC that is about to be reproduced
Check if it is the ID of C block.

Here, the ID whose ID is desired to be read
If the ID is a CC block or sector, error correction processing is performed on the LDC area. Next, the microcomputer 1406 sets the BI
The seed written in the S area is read out, and the operation of Equation 3 is performed on the user data stored in the RAM.

[0109]

[Equation 3]

The 1-byte seed is used as an initial value of c-7 to c0 in calculating the equation 3. bi is the value of the i-th bit after scrambling, and ci is the value of the i-th bit from the beginning of the read sequence.

After scrambling, the ID deleting circuit 140
In step 7, the additional information 720 bytes such as ID is deleted. After that, the EDC is used to check the error of the user data 2048 bytes. After that, user data 2048b
The yte is transferred to the host computer via the interface 311. As described above, by adopting the configuration of the seventh embodiment, the existing optical disk control LSI 26
Random seed scrambling can be applied by processing only software without changing 11. Therefore, random seed scrambling can be applied to a system equipped with an existing optical disk control LSI by making a few changes.

Next, the eighth embodiment will be described. It is generally said that when an optical disc is used as a recording medium for a computer, it is required to endure more times of rewriting than when an optical disc is used for an audio. It is the FAT (File Alloca) in which the computer is written in the disc.
This is because the disk management is performed while frequently rewriting the "Action Table", and it is said that the area in which the FAT is written is rewritten 10 times or more than the area in which general data is written. By the way, the optical disk drive 3904 in the present embodiment is an optical disk drive having an object command compatible interface for performing file management in the optical disk drive 3904, and the host computer 3905 writes with a file name instead of a specific physical address. , Shall be read. FIG. 37 shows an optical disk medium 301 used in this embodiment. In the optical disc medium 301, an area 3702 written by performing random seed scrambling, and areas 3701 and 370 written by not performing random seed scrambling.
It is divided into three. In each of 3702 and 3703, the FAT is written in a scrambled form and in an unscrambled form, respectively.

FIG. 39 shows a DV according to the eighth embodiment.
It is a schematic block diagram of a D device. Reference numeral 311 controls input / output of data to / from a higher-level device and converts a file name and a physical address. Reference numeral 1406 is a microcomputer that controls the system. The microcomputer 1406 has an interface 311.
Connected to control interface 311. The microcomputer 1406 is a control circuit 14 in the system.
11, the control circuit 1411 controls the seed generator 2603, the error correction coding circuit 307, the scramble 2601 and the like via a control line (not shown). Reference numeral 1401 denotes an ID adder that adds additional information necessary for recording, such as an ID, to the user data provided by the interface 311, and 1402 is a memory (RAM) that temporarily stores the data. 3902
Is a scrambler for randomizing data. This scrambler is the scrambler shown in FIG. 45 and includes a fixed-seed M sequence generator and a random seed scrambler. This is almost the same as that described in the first embodiment, but is different from the first embodiment in that a switch 4506 that can select whether to perform random seed scrambling is provided. Switch 45
06 is controlled by a signal line 4507 indicating ON / OFF of random seed scramble controlled by a microcomputer. Reference numeral 3901 is a seed generator that gives a different seed to the random seed scrambler in the scrambler 3902 each time writing is performed. Reference numeral 307 is an error correction coding circuit for adding an error correction code to the scrambled user data, and 305 is a coding for converting the user data to which the error correction code is added into a run length limited code suitable for recording on the optical disc 301. A circuit, 302 is a pickup for recording / reproducing data on the optical disc 301, and 1403 is a spindle motor for rotating the disc. Reference numeral 1404 is a servo that controls the optical pickup 302 and the like.

Reference numeral 304 denotes a read channel for performing waveform equalization processing, binarization and synchronization clock generation of the analog reproduction signal read from the optical disk 301. 306 is
Decoder for decoding the read run length limited code, 308
Is an error detection / correction circuit that detects an error based on the error correction code added by the error correction coding circuit 307 and corrects the error. Reference numeral 3903 removes the randomization performed by the scrambler 3902. This is a descramble circuit that returns the user data of
It is a descrambler shown in FIG. 46 and has a fixed seed M.
It includes a sequence generator 4601 and a random seed descrambler 4603. This is almost the same as that described in the first embodiment, but the switch 4606 that can select whether to perform random seed descrambling or not.
Is different from that of the first embodiment. Switch 4
606 is controlled by a signal line 4607 indicating random seed scramble ON / OFF controlled by a microcomputer. An ID deleter 1407 deletes additional information necessary for recording such as an ID added by the ID adder 1401 and leaves only user data.

FIG. 40 is a diagram showing a seed generator 3901 of the eighth embodiment. 1301 and 1302 are both 1-bit shift registers, and 1303 is an exclusive OR circuit. The 1-bit shift register 1301 contains an appropriate value other than all zeros in the initial state. When a seed is requested when writing data, clock (1
305) is input to the 1-bit shift register 130
The value of 1, 1302 is shifted to the left. The output value of the exclusive OR circuit 1303 is input to the 1-bit shift register 1302. After that, 1-bit shift register 1
The seed value stored in 301 and 1302 is output to the scramble circuit 3902 as a seed through the 8-bit seed output line 1307.

The operation of the DVD device shown in FIG. 39 will be described below. First, the recording operation will be described with reference to the optical disc shown in FIG. 37 and the recording processing procedure shown in FIG.

First, when the file name and file size to be written are input from the interface 311 (step 4101), the microcomputer 1406 reads the FAT stored in the area 3703 (step 4102) and writes. The physical address to be written is calculated from the size of the file (step 410).
3). Next, the data to be written is fetched from the interface 311 (step 4104), and step 41
Area 370 indicated by the physical address calculated in 03
Writing is performed at a location within 1 without random seed scrambling (step 4105).

Next, the FAT is updated, and the FAT is written in the area 3703 without random seed scrambling (step 4106). Next, the same FAT is randomly seed scrambled and written in the area 3702 (step 410).
7). Next, the FAT written in the area 3703 is read and it is checked whether the FAT is written without error (step 4107). Since the area 3703 is written without being scrambled, the medium is deteriorated earlier than the area 3702, and an error occurs earlier. Step 4
If the error is within the error-correctable range in 107, the writing process ends. Step 410
If the error is larger than the error correctable range in 7, the FAT stored in the area 3702 is descrambled and stored in the area 3704. After that F
Area 3704 is used as the AT area (step 41)
09). Then, the writing process ends.

As shown in the eighth embodiment, the FAT
By scrambling and storing the FAT data, it is possible to protect FAT data that is frequently written. Further, by writing one of the data area and FAT in which rewriting does not occur frequently on the optical disk medium in a non-scrambled form, it is possible to read data by an existing optical disk device which does not support scrambling.

Next, a ninth embodiment will be described with reference to FIGS. 39, 42 and 44. A block diagram of the DVD device in the ninth embodiment is shown in FIG. However, the DVD device 3904 in the ninth embodiment is
Instead of an optical disk compatible with object commands, it is a DVD device in which file management is performed by a host computer and writing is performed at an address such as a logical block address or physical block address specified by the host computer by a write command.

The DVD device 3904 of this embodiment is shown in FIG.
Part 4 of the optical disk medium for writing as shown in 2
202 is treated as an area to be scrambled and written, a portion 4203 of the optical disk medium to be written is an area to be written without scrambled, and information from which track is which area is scrambled and written, or from which track The track 4201 stores information indicating which track is the area to be written without scrambling.

This information is the scramble mode information 2902, 2903, 2904, 2905 shown in the second embodiment.
Similarly, the reliability can be improved by using writing in a plurality of places, a strong ECC, or the like. The DVD device 3904 of the present embodiment, when the power is turned on or when the disk medium is replaced, as shown in FIG. Information on which track is the area to be written without scrambling) is transmitted to the host computer (step 4301). The host computer scrambles the FAT data that has been rewritten a lot, or the data that has been rewritten a lot due to the nature of the application, and writes it in the writing area. The host computer calculates the logical sector number or physical sector number corresponding to the scramble using the message indicating the scramble corresponding area obtained in step 4301, and allocates particularly rewritten data such as FAT data to the sector of the area to be written by performing the scramble. , Write command to write. As shown in the ninth embodiment, by scrambling and storing the FAT and especially the area where writing frequently occurs, FAT data where writing frequently occurs can be protected.

Next, regarding the tenth embodiment, FIG.
This will be described with reference to FIG. D in the tenth embodiment
A block diagram of the VD device is shown in FIG. However,
The DVD device 3904 according to the tenth embodiment is not an optical disc compatible with object commands like the DVD device according to the ninth embodiment. File management is performed by the host computer, and a logical block specified by the host computer by a write command. It is a DVD device that writes to an address or an address such as a physical block address.

In the DVD device 3904 of this embodiment, scramble mode information 2902, 2903, 2904, 2905 indicating whether or not the optical disk medium of this embodiment is compatible with scrambling is recorded as in the second embodiment. There is. When the power is turned on or the disk medium is replaced,
As shown in FIG. 43, the DVD device 3904 has scramble mode information 2902, 290 from the optical disc medium.
3, 2904 and 2905 are read out, and a message indicating that the optical disc is scramble compatible is transmitted to the host computer (step 4301).

When the optical disk being written is a scramble-compatible optical disk, the host computer
When writing data such as FAT data that is particularly rewritten or data that is known to be particularly rewritten by the application, the DVD device is instructed to write the data by random seed scrambling.

Specifically, the host computer is a DVD.
A fixed 1 bit in the command byte issued to the device specifies whether or not random seed scrambling is performed. If the DVD device 3904 indicates that the determined 1 bit in the command byte is scrambled, the random seed scramble O
The signal line 4507 indicating N / OFF is controlled to be ON, the data is scrambled, and writing is performed at the designated address. The DVD device 3904 is a random seed scramble ON / OF if the determined 1 bit in the command byte indicates that the scramble is not performed.
The signal line 4507 indicating F is controlled to OFF, and the data is written to the designated address without random seed scrambling. As shown in the tenth embodiment, by scrambling and storing the FAT and especially the area where writing frequently occurs, FAT data where writing frequently occurs can be protected. The method for the host computer to specify whether or not to perform random seed scrambling for the DVD device is not limited to the method of using one bit in the command byte, but also a method of transmitting it as a message byte to another or a host. Is DV
For example, there is a method of writing a specific value to 1 bit of a specific register determined in advance in the interface section in the D device. These methods are effective when there are no empty bits in the command byte. In particular, in an interface such as SCSI, it is considered that a method of transmitting another as one bit in the message byte is effective, and a method of writing a specific value in one bit of a specific register determined in advance is effective in the ATA interface. .

Next, the eleventh embodiment will be described with reference to FIG. The DVD device of this embodiment is also shown in FIG. FIG. 38 is a diagram showing an optical disc medium 301 of the eleventh embodiment, and is a diagram showing a cross section of the optical disc medium 301 with a part thereof cut. Optical disc 301
Has n recording layers, and 3801, 38 from the surface
02, and the layer farthest from the surface is 3803. In general, the layer farthest from the surface 3803 does not need to transmit light to the back, and thus a metal can be used as a reflective layer that reflects light, but the layers 3801 and 3802 closer to the surface are Since it is necessary to transmit light to the back, metal cannot be used as the reflective layer,
It is characterized in that the flow phenomenon easily occurs and the medium deterioration due to overwriting easily occurs. Therefore, in the present embodiment, the first recording layer 3801 from the surface,
The recording layer 3802 of the first layer, ..., The recording layer of the n−1th layer from the surface performs random seed scrambling to prevent deterioration of the medium and records data on the medium. The eye recording layer 3803 is for recording without performing random seed scrambling. In the innermost track 3804 of each layer, as in the second embodiment, scramble mode information 2902, 2903, 2904, 2905 indicating whether each layer supports random seed scrambling.
Is recorded.

The optical disk drive reads out the scramble mode information of each innermost layer when the power is turned on, when the optical disk medium is replaced, or when the layer being accessed is moved, and the value is read by the microcomputer. It is stored in the memory and is controlled at the time of writing whether the random seed scrambling is performed before the writing or the random seed scrambling is not performed. By doing this, DV that does not support random seed scrambling
In the D device, it can be handled as a single-layer optical disc having only the n-th layer 3803, and in the DVD device that supports random seed scrambling,
It can be handled as an optical disc that has recording layers of all layers and can guarantee the number of rewrites of all layers above a certain level.
It is handled as an optical disc having a recording capacity of n times that of an optical disc having only layers. In such an optical disc, for example, by inserting basic data such as images and sounds in the recording layer 3803 and interpolation data in the recording layers 3801 and 3802, image quality and sound quality can be obtained in a DVD device that does not support random seed scrambling. In a DVD device capable of reproducing only unsatisfactory data and capable of random seed scrambling, it can be used as an optical disc medium capable of reproducing high quality image quality and sound quality.

It is needless to say that the present invention is not limited to the above-mentioned embodiments, and can be modified and carried out within the scope not departing from the gist regardless of the field of application.

[0130]

According to the present invention, random seed scrambling that can prevent medium deterioration is added to the original data to be recorded on the disc by adding arbitrary seed data and scrambling the data. It can be applied to optical disks. In addition, some sectors have random seed scrambling and some do not.
Playback is possible even when mixed on a single optical disc. Moreover, reading and writing can be performed on the same optical disk in both a device that does not employ random seed scrambling and a device that does not employ random seed scrambling.

[Brief description of drawings]

FIG. 1 is a diagram showing a scramble circuit of the present invention.

FIG. 2 is a diagram showing a descramble circuit of the present invention.

FIG. 3 is a schematic block diagram of the first embodiment of the present invention.

FIG. 4 is a detailed block diagram of a scramble circuit according to the first embodiment of the present invention.

FIG. 5 is a detailed circuit diagram of the M-sequence generator according to the first embodiment of the present invention.

FIG. 6 is a detailed circuit diagram of a secondary scramble circuit according to the first embodiment of the present invention.

FIG. 7 is a detailed block diagram of a descramble circuit according to the first embodiment of the present invention.

FIG. 8 is a detailed circuit diagram of a secondary descrambling circuit according to the first embodiment of the present invention.

FIG. 9 is a conceptual diagram of the first embodiment of the present invention.

FIG. 10 is a recording format diagram of a next-generation optical disc.

FIG. 11 is a data sector format diagram of the second embodiment of the present invention.

FIG. 12 is a recording format diagram of the second embodiment of the present invention.

FIG. 13 is a recording format of a fourth embodiment of the present invention.

FIG. 14 is a system block diagram of a second embodiment of the present invention.

FIG. 15 is a processing flowchart at the time of recording according to the second embodiment of the present invention.

FIG. 16 is a processing flowchart at the time of reproduction according to the second embodiment of this invention.

FIG. 17 is a schematic block diagram of a fourth embodiment of the present invention.

FIG. 18 is a block diagram of an optical disc system according to a fourth embodiment of the present invention.

FIG. 19 is a detailed block diagram of a seed generator according to the second embodiment of the present invention.

FIG. 20 is a block diagram of a scramble circuit according to a second embodiment of the present invention.

FIG. 21 is a block diagram of a descramble circuit according to a second embodiment of the present invention.

FIG. 22 is a diagram showing a recording format of a third embodiment of the present invention.

FIG. 23 is a block diagram of a rewrite frequency recording memory according to a third embodiment of the present invention.

FIG. 24 is a part of a processing flowchart at the time of recording according to the third embodiment of the present invention.

FIG. 25 is a processing flowchart at the time of reproduction according to the third embodiment of this invention.

FIG. 26 is a block diagram of an optical disc system according to a fifth embodiment of the present invention.

FIG. 27 is a block diagram of an optical disc system according to a sixth embodiment of the present invention.

FIG. 28 is a block diagram of an optical disc system according to a third embodiment of the present invention.

FIG. 29 is a schematic diagram of an optical disc medium according to a second embodiment of the present invention.

FIG. 30 is a schematic diagram of an optical disc medium according to a third embodiment of the present invention.

FIG. 31 is a processing flowchart at the time of partial rewriting according to the second embodiment of the present invention.

FIG. 32 is a processing flowchart when the power is turned on and the optical disc is inserted according to the third embodiment of the present invention.

FIG. 33 is a part of a processing flowchart at the time of recording according to the third embodiment of the present invention.

FIG. 34 is a part of a processing flowchart at the time of recording according to the third embodiment of the present invention.

FIG. 35 is a block diagram of an optical disc system according to a seventh embodiment of the present invention.

FIG. 36 is a part of a processing flowchart when the power is turned off and the optical disk is taken out according to the third embodiment of the present invention.

FIG. 37 is a schematic diagram of an optical disc medium of an eighth embodiment of the present invention.

FIG. 38 is a schematic diagram of an optical disc medium according to an eleventh embodiment of the present invention.

FIG. 39 is a block diagram of an optical disc system according to eighth to eleventh embodiments of the present invention.

FIG. 40 is a detailed block diagram of a seed generator according to eighth to eleventh embodiments of the present invention.

FIG. 41 is a flowchart showing a recording process according to the eighth embodiment of the present invention.

FIG. 42 is a schematic view of an optical disc medium according to a ninth embodiment of the present invention.

FIG. 43 is a flow chart showing processing when power is turned on or a disk is replaced according to the tenth embodiment of the present invention.

FIG. 44 is a flow chart showing processing when power is turned on or a disk is replaced according to the ninth embodiment of this invention.

FIG. 45 is a detailed block diagram of a scrambler according to an eighth to eleventh embodiment of the present invention.

FIG. 46 is a detailed block diagram of a descrambler of the eighth to eleventh embodiments of the present invention.

[Explanation of symbols]

101 to 104: 1-bit register 105-109: Exclusive OR circuit 201-204: 1-bit register 205-209: Exclusive OR circuit 301: Optical disc 302: Optical head 303: Recording / playback amplifier 304: Data reproduction circuit 305: Run length limited encoding circuit 306: Run length limited code decoding circuit 307: Error correction coding circuit 308: Error correction circuit 309: Scramble circuit 310: Descramble circuit 311: Host I / F 401: M sequence generator 402: Exclusive OR circuit 403: Random seed scrambler 404: Random data addition circuit 405: Secondary scramble circuit 501: Exclusive OR circuit 502-516: 1-bit register 601 to 604: Exclusive OR circuit 605 to 612: 1-bit register 701: M series generator 702: Exclusive OR circuit 703: Random seed descrambler 704: Secondary descramble circuit 705: Random data deletion circuit 801 to 808: 1-bit register 809-812: Exclusive OR circuit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI theme code (reference) G11B 20/18 G11B 20/18 576Z 7/0045 7/0045 Z 20/10 301 20/10 301Z 20/12 20/12 (72) Inventor Jiichi Miyamoto 1-280 Higashi Koigakubo, Kokubunji, Tokyo Inside Central Research Laboratory, Hitachi, Ltd. (72) Inventor Takushi Nishitani 1099, Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Hitachi, Ltd. System development In-house (72) Inventor Takatoshi Kato 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Hitachi Ltd. System Development Laboratory (72) Inventor Shigeki Hira 1099, Ozen-ji, Aso-ku, Kawasaki-shi, Kanagawa Hitachi, Ltd. In the development laboratory (72) Inventor Osamu Kawamae 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Office of Digital Media Development (72) Inventor Taku Hoshizawa 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa F-Term (Reference) 5D044 AB05 AB07 BC04 CC06 DE38 DE61 EF05 FG18 GK12 GK14 GK19 5D090 AA01 BB04 CC01 CC04 CC06 EE06 EE11 FF49 GG17 GG36

Claims (8)

[Claims] 1. An optical disc device using a data randomization method for generating and writing seeds during a writing process, wherein the seeds are error-correction-coded into one codeword together with additional information such as a writing position of data to be written. An optical disk device characterized by. 2. The optical disk device according to claim 1,
An optical disk device, wherein a part of the seed is the number of times of rewriting. 3. The optical disk device according to claim 1,
An optical disk device, wherein part of the seed is part of the track number or ID. 4. The optical disk device according to claim 1, wherein 1
Multiple seeds are prepared in one writing process,
An optical disk device characterized by selecting a sequence having good characteristics from sequences of run length limited codes made from a plurality of seeds. 5. The optical disk device according to claim 1,
An optical disk device characterized in that address information of data is not scrambled. 6. The optical disk device according to claim 1,
When the data is reproduced, the ID information of the data is checked before descrambling, and if there is no error, it is recognized as unscrambled data. If there is an error, the ID information of the data is checked again after the descrambling process is completed. If there is no error, the optical disk device is characterized in that the data is recognized and processed as scrambled data. 7. The optical disk device according to claim 1,
When data is reproduced, it is checked with the error detection code of the data before descrambling, and if there is no error, it is recognized as unscrambled data. If there is an error, the error detection code of the data is re-executed after the descrambling process ends. An optical disk device characterized by performing inspection according to the above, and recognizing as scrambled data if there is no error and performing processing. 8. The optical disk device according to claim 1,
An optical disk device, wherein data is recorded using an optical disk medium having an area to record unscrambled data and an area to be scrambled.