JP2000195182A - Information recording medium, defect management method device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to obtain a position of an alternative area almost without calculation, by arranging a spare area on an inner peripheral side of a user area, and recording in a disk information area a physical sector number allotted with a logical sector number '0', of plural sectors contained in the user area and the spare area. SOLUTION: A spare area 7 is arranged on an inner peripheral side of a user area on an optical disk. A physical sector number of a sector, to which a logical sector number '0' is allotted as a disk structure defining information DDS with the primary and secondary defect lists, is stored in a defect, managing area DMA of a disk information managing area 4. The physical sector number of the leading sector in an alternative area used for a linear replacement algorithm is fixed. The physical sector number of the final sector in the alternative area can be obtained by subtracting 1 from the physical sector number recorded in the disk information area 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an information recording medium, a defect management method, and a defect management device.

[0002]

2. Description of the Related Art A typical information recording medium having a sector structure is an optical disk. 2. Description of the Related Art In recent years, the density and capacity of optical disks have been increasing, and securing the reliability of optical disks has become an important issue.

FIG. 23 shows a logical structure of a conventional optical disk.

[0004] The area of the optical disk includes two disk information areas 4 and a data recording area 5. Data recording area 5
Includes a user area 6 and a spare area 8. The spare area 8 is arranged on the outer peripheral side of the optical disk with respect to the user area 6.

The user area 6 includes a system reservation area 11
, FAT area 12 and root directory area 13
And a file data area 14. The system reserved area 11, the FAT area 12, and the root directory area 13 are called a file management area 10. The first sector of the file management area 10 has a logical sector number “0” (L
SN: 0) are allocated as assigned sectors.

A defect management method for managing defective sectors on an optical disk is described in International Standards Organization ISO / IEC10090 (hereinafter abbreviated as ISO standard) for 90 mm optical disks.

Hereinafter, two defect management methods described in the ISO standard will be described. The first defect management method is a method based on a slipping replacement algorithm. The second defect management method is a method based on a linear replacement algorithm. These algorithms are described in Chapter 19 of the ISO standard.

FIG. 24 is a conceptual diagram of a conventional slipping replacement algorithm. In FIG. 24, a rectangle represents a sector. The symbol in the rectangle indicates the logical sector number (Logical) assigned to the sector.
Sector Number; LSN). A rectangle with a symbol indicates a normal sector. A hatched rectangle indicates a defective sector.

Reference numeral 2401 indicates a sector column when no defective sector exists in the user area 6, and reference numeral 2402 indicates a sector column when one defective sector exists in the user area 6.

When the first sector of the user area 6 is a normal sector, the first LS is added to the first sector of the user area 6.
N: 0 is assigned. From the sector to which the head LSN: 0 is assigned, the LSN is assigned to each of the plurality of sectors included in the user area 6 in ascending order.

If no defective sector exists in the user area 6, LSN: 0 to LSN: m are sequentially assigned to the last sector from the first sector of the user area 6 (see sector column 2401).

If the sector to which LSN: i is assigned in the sector row 2401 is a defective sector,
The LSN assignment is changed. That is, LSN: i is not assigned to the defective sector. Instead, LSN: i is assigned to the immediately succeeding sector. As a result, the assignment of the LSN slips by one sector in the direction from the user area 6 to the spare area 8. As a result, the last LSN: m is assigned to the first sector of the spare area 8 (see the sector column 2402).

FIG. 25 shows the correspondence between the physical sector numbers and the LSNs after executing the slipping replacement algorithm described with reference to FIG. The horizontal axis indicates the physical sector number, and the vertical axis indicates the LSN. FIG.
, A dashed-dotted line 2501 indicates the correspondence between the physical sector number and the LSN when there is no defective sector,
A solid line 2502 indicates the correspondence between the physical sector number and the LSN when there are four defective sectors I to IV.

As shown in FIG. 25, no LSN is assigned to a defective sector. The assignment of the LSN slips in the direction from the inner circumference to the outer circumference of the optical disc (that is, the direction in which the physical sector number increases). As a result, the LSN is assigned to some sectors of the spare area 8 located immediately after the user area 6.

An advantage of the slipping replacement algorithm is that access delay due to defective sectors is small. For each defective sector, access delay is only required to wait for rotation of one sector. Slipping
The disadvantage of the replacement algorithm is that the assignment of LSNs to all sectors after the defective sector shifts. Since a higher-level device such as a host PC identifies a sector by an LSN, if the assignment of an LSN to a sector shifts, it becomes impossible to manage user data recorded on an optical disk. Therefore, if the user data has already been recorded on the optical disc, the slipping replacement algorithm cannot be used.

FIG. 26 is a conceptual diagram of a conventional linear replacement algorithm. In FIG. 26, a rectangle represents a sector. The symbol in the rectangle indicates the LSN assigned to that sector. A rectangle with a symbol indicates a normal sector. A hatched rectangle indicates a defective sector.

Reference numeral 2601 indicates a sector row in the case where no defective sector exists in the user area 6, and reference numeral 2602 indicates a sector row in the case where one defective sector exists in the user area 6.

If the sector to which LSN: i is assigned in the sector column 2601 is a defective sector,
The LSN assignment is changed. That is, LSN: i is not assigned to the defective sector. Instead, of the plurality of sectors included in the spare area 8, the unused sector having the smallest physical sector number (for example, the spare area 8
LSN: i is assigned to the first sector (see sector column 2602). As described above, the defective sector in the user area 6 is replaced with the sector in the spare area 8.

FIG. 27 shows the correspondence between the physical sector numbers and the LSNs after executing the linear replacement algorithm described with reference to FIG. The horizontal axis indicates the physical sector number, and the vertical axis indicates the LSN. In FIG. 27, a solid line 2701 indicates the correspondence between the physical sector number and the LSN when there are two defective sectors. Each of the two defective sectors in the user area 6 is replaced by a replacement sector in the spare area 8.

An advantage of the linear replacement algorithm is that replacement of a defective sector does not affect other sectors because a defective sector and a replacement sector correspond one-to-one. A disadvantage of the linear replacement algorithm is that access delays due to defective sectors are large. Accessing an alternate sector instead of a defective sector requires a significant distance seek operation.

As described above, the linear replacement
The advantages and disadvantages of the algorithm are the opposite of the advantages and disadvantages of the slipping replacement algorithm.

FIG. 28 shows the LS assigned to each sector.
N shows an example. In the example shown in FIG. 28, the size of the user area 6 is 100,000, and the size of the spare area 8 is 1
0000 and four defective sectors I to IV in the user area 6 are assumed.

According to the slipping replacement algorithm described above, an LSN is assigned to each sector.

First, LSN: 0, which is the first LSN, is allocated to the sector with physical sector number: 0. next,
LSNs are allocated to each sector in ascending order along the direction from the inner circumference to the outer circumference of the optical disc (ie, from the user area 6 to the spare area 8). However, no LSN is assigned to a defective sector, and its LS
N is assigned to the sector immediately after the defective sector. As a result, the assignment of the LSN slips in the direction from the inner circumference to the outer circumference of the optical disc by the number of defective sectors.

In the example shown in FIG. 28, there are four defective sectors I to IV in the user area 6. If there is no defective sector, the LSNs assigned to the four sectors of the user area 6 are 99996 to LSN: 99.
999 is the physical sector number of the spare area 8: 10000
It is allocated to each of four sectors 0 to 100003. This is because the assignment of the LSN slips by the number of defective sectors (four).

In FIG. 28, the area of the physical area number: 100004 to 99999 of the spare area 8 is described as "LR spare area". The LR spare area is defined as an area of the spare area 8 to which no LSN has been assigned. The LR spare area is used as an alternative sector area for the linear replacement algorithm.

[0027]

According to the conventional linear replacement algorithm, when a sector having a small physical sector number is detected as a defective sector,
Since the distance between the defective sector and the substitute sector is large, there is a problem that access delay due to the defective sector is large (see FIG. 27). In particular, since the file management area 10 located near LSN: 0 is always accessed each time a file is recorded, a defective sector in the file management area 10 may directly reduce the access speed to the optical disc. Since the file management area 10 is frequently accessed, the frequency of occurrence of defective sectors in the file management area 10 is expected to be high.

An alternative area (LR spare area) used in the linear replacement algorithm
To determine the start address of the sector, it is necessary to calculate the slip of the sector by the slipping replacement algorithm. The amount of calculation increases as the disk capacity increases.

The present invention has been made in view of the above-mentioned problem, and is intended to provide information in which even if a defective sector is detected in a file management area located near LSN: 0, access delay due to the defective sector is small. A recording medium, a defect management method, and a defect management device are provided.

Another object of the present invention is to provide an information recording medium, a defect management method, and a defect management device that can determine the position of an LR spare area with almost no calculation.

[0031]

An information recording medium according to the present invention comprises a disk information area, a user area including a plurality of sectors, and at least one of the plurality of sectors included in the user area is a defective sector. A spare area including at least one sector that can be used instead of the at least one defective sector in some cases, wherein the spare area is located on the inner periphery of the information recording medium relative to the user area. And a physical sector number of a sector to which a logical sector number “0” is allocated among the plurality of sectors included in the user area and the spare area is recorded in the disk information area. . Thereby, the above object is achieved.

The sectors other than the defective sectors included in the user area may be assigned logical sector numbers in descending order from the sector to which the last logical sector number has been assigned.

[0033] The physical sector number of the defective sector may be recorded in the disk information area.

The user area and the spare area are:
The plurality of zones may be divided, and a logical sector number assigned to a first sector of each of the plurality of zones may be recorded in the disk information area.

The user area and the spare area are:
The data is divided into a plurality of zones, and data recorded on the information recording medium is managed in ECC block units.
A logical sector number may be assigned to a sector other than the defective sector included in the user area so as to match the first sector of the block.

The defect management method according to the present invention is characterized in that the disc information area, a user area including a plurality of sectors, and at least one of the plurality of sectors included in the user area is a defective sector when at least one of the plurality of sectors is a defective sector. A spare area including at least one sector that can be used in place of the one defective sector, wherein the spare area is provided with a defect management method for an information recording medium that is arranged on an inner peripheral side of the information recording medium with respect to the user area. (A) assigning a final logical sector number to one of the plurality of sectors included in the user area; and (b) determining a position of the sector to which the final logical sector number is assigned. Calculating a position satisfying a predetermined capacity as a reference; and (c) assigning a logical sector number to a sector located at the calculated position. Assigning a "0",
(D) recording the physical sector number of the sector to which the logical sector number “0” is assigned in the disk information area, thereby achieving the above object.

The step (b) comprises: (b-1) detecting a defective sector included in the user area;
(B-2) Based on the number of the detected defective sectors,
Calculating a position that satisfies the predetermined capacity.

[0038] The defect management method may further include the step of (e) recording the detected defective sector on the information recording medium.

The user area and the spare area are:
The defect management method is divided into a plurality of zones,
(F) recording a logical sector number assigned to a head sector of each of the plurality of zones in the disk information area.

The user area and the spare area are:
Data recorded on the information recording medium is divided into a plurality of zones, and data recorded on the information recording medium is managed in units of ECC blocks. The defect management method includes: (g) the first sector of each of the plurality of zones is an ECC block; The method may further include a step of assigning a logical sector number to a sector other than the defective sector included in the user area so as to match the leading sector.

[0041] The defect management apparatus of the present invention may further comprise a disk information area, a user area including a plurality of sectors, and at least one of the plurality of sectors included in the user area being a defective sector when at least one of the plurality of sectors is a defective sector. A spare area including at least one sector that can be used in place of one defective sector, wherein the spare area is located on the inner peripheral side of the information recording medium with respect to the user area. Wherein the defect management device executes a defect management process, wherein the defect management process includes:
(A) assigning a final logical sector number to one of the plurality of sectors included in the user area; and (b) determining a predetermined logical sector number based on a position of the sector to which the final logical sector number is allocated. (C) assigning a logical sector number "0" to the sector located at the calculated position; and (d) assigning the logical sector number "0". Recording the physical sector number of the sector in the disk information area, thereby achieving the above object.

The step (b) includes: (b-1) detecting a defective sector included in the user area;
(B-2) Based on the number of the detected defective sectors,
Calculating a position that satisfies the predetermined capacity.

The defect management processing may further include the step of: (e) recording the detected defective sector on the information recording medium.

The user area and the spare area are:
The defect management process is divided into a plurality of zones,
(F) recording a logical sector number assigned to a head sector of each of the plurality of zones in the disk information area.

The user area and the spare area are:
The data recorded on the information recording medium is managed in units of ECC blocks, and the defect management processing includes: (g) the first sector of each of the plurality of zones is an ECC block. The method may further include a step of assigning a logical sector number to a sector other than the defective sector included in the user area so as to match the leading sector.

[0046]

Embodiments of the present invention will be described below with reference to the drawings.

[0047] (Embodiment 1). Configuration diagram of the information processing system 1 shows a configuration of an information processing system according to the embodiment of the present invention. The information processing system includes a host device 200 and a disk recording / reproducing device 100. The disk recording / reproducing device 100, in accordance with a command from the host device 200,
Record information on the rewritable optical disc 1, or
The information recorded on the optical disk 1 is reproduced. Host device 2
00 is, for example, a personal computer.

The host device 200 includes a CPU 201, a main memory 204, a bus interface (bus I / F) 203.
, A processor bus 202, an I / O bus 205, a hard disk drive (HDD) 206, and a display processing unit 20.
7 and an input unit 208. The host device 200 has an I /
It is connected to the disk recording / reproducing apparatus 100 via the O bus 205.

The processor bus 202 is a high-speed bus for the CPU 201 to access the main memory 204. The processor bus 202 has an I / F via a bus I / F 203.
It is connected to the O bus 205.

In the example shown in FIG. 1, the I / O bus 205 is a personal computer expansion bus such as a PCI bus or an ISA bus. The I / O bus 205 is a SCSI (Small)
Computer System Interface
e), ATA (AT Attachment), USB
(Universal Serial Bus), IE
It can be any general purpose bus such as EE1394.

The display processing unit 207 converts display information sent from the I / O bus 205 into a signal such as RGB and outputs the signal to a display.

The input unit 208 notifies the CPU 201 of an input from an input device such as a keyboard or a mouse via the I / O bus 205.

The HDD 206 is an auxiliary storage device for inputting and outputting data to and from the main storage 204 via the I / O bus 205. The HDD 206 includes MS-DOS and Windows.
Operating system such as ws and program files are stored. These are loaded into the main memory 204, and are processed by the CPU 201 in accordance with instructions from the user. The calculation processing result is displayed on the display processing unit 20
7 is displayed on the display.

The disk recording / reproducing apparatus 100 includes a microprocessor 101, a data recording / reproducing control unit 102,
It includes a bus control circuit 103 and a memory 104.

The microprocessor 101 operates in accordance with a control program stored in the microprocessor 101.
Various processes are executed by controlling each unit of the disk recording / reproducing apparatus 100. The defect management processing and substitution processing described below are also executed by the microprocessor 101.

The data recording / reproducing control unit 102 controls recording / reproducing of data on the optical disk 1 in accordance with an instruction from the microprocessor 101. The data recording / reproduction control unit 102 adds an error correction code to data at the time of recording, and performs an error detection process and an error correction process at the time of reproduction. Generally, data encoded by an encoding process such as CRC or ECC is recorded on the optical disc 1.

The bus control circuit 103 includes an I / O bus 205
Command from the host device 200 via the
It transmits and receives data to and from the host device 200 via the O bus 205.

The memory 104 stores the disk recording / reproducing device 1
It is used to store data in various processes performed at 00. For example, the memory 104
Has an area used as an intermediate buffer during data recording and reproduction, and an area used when the data recording and reproduction control unit 102 performs an error correction process.

The optical disk 1 is a disc-shaped information recording medium on which data can be recorded and reproduced. As the optical disc 1, any information recording medium including a DVD-RAM can be used. Recording and reproduction of data are performed in sector units or block units. 2. Physical Structure of Optical Disk 1 FIG. 2 shows a physical structure of the optical disk 1. A plurality of tracks 2 are formed concentrically or spirally on a disc-shaped optical disc 1. Each of the plurality of tracks 2 is divided into a plurality of sectors 3. Optical disk 1
Area includes one or more disk information areas 4 and a data recording area 5.

The disk information area 4 stores parameters necessary for accessing the optical disk 1. In the example shown in FIG. 2, the disk information area 4
The optical disk 1 is provided on the innermost peripheral side and the outermost peripheral side, respectively. The innermost disk information area 4 is also called a lead-in area. The disk information area 4 on the outermost side is a lead-out (lead-out).
t) Also called a region.

In the data recording area 5, data is recorded. Data recording / reproduction is performed on the data recording area 5. Absolute addresses called physical sector numbers are assigned to all sectors of the data recording area 5 in advance. 3. Logical structure diagram 3 of the optical disc 1 shows the logical structure of the optical disc 1. The data recording area 5 includes a user area 6 and a spare area 7.

The user area 6 is an area prepared for storing user data. Normally, user data is stored in the user area 6. In order to access the user area 6, each sector included in the user area 6 is assigned a logical sector number (Logical Sector Number).
r; LSN). The host device 200 shown in FIG. 1 records and reproduces data by accessing a sector of the optical disc 1 using the LSN.

The spare area 7 includes at least one sector that can be used in place of a defective sector when a defective sector occurs in the user area 6. The defective sector in the user area 6 is generated due to, for example, a cause such as a scratch, dirt, or material deterioration of the user area 6. The spare area 7 is arranged on the inner peripheral side of the optical disc 1 with respect to the user area 6. Preferably, spare area 7 is arranged immediately before user area 6.

The user area 6 includes a system reservation area 11
, FAT area 12 and root directory area 13
And a file data area 14. Such an area configuration conforms to the file system of the MS-DOS format. However, the area configuration shown in FIG. 3 is merely an example.

The system reserved area 11 stores parameter information and volume information of the optical disc 1 as a boot sector. These information are stored in the host device 2
00.

When the host device 200 accesses the optical disk 1, the host device 200 must access the system reserved area 11 without fail. The logical sector number “0” (LSN:
0) is assigned. Also, system reserved area 1
The size and arrangement of each item 1 are also predetermined.

The FAT area 12 has a file allocation table (File) for recording arrangement information indicating where files and directories are arranged in the file data area 14 and information indicating the positions of free areas.
Allocation Table; FAT) is stored.

The root directory area 13 stores entry information on files and subdirectories. The entry information includes a file name / directory name, a file attribute, update date and time information, and the like.

The above-mentioned system reservation area 11, FAT area 12, and root directory area 13 are called a file management area 10. The file management area 10 is arranged on the optical disc 1 at a position corresponding to the fixed LSN.

The file data area 14 stores data representing a directory associated with the root directory and data representing a file. As described above, when the host device 200 accesses the data stored in the file data area 14, it is necessary to access the file management area 10 before accessing the file data area 14. 4. Defect Management Method of Optical Disk 1 In order to manage such a defective sector of the optical disk 1, a primary defect list (Primary Defect) is used.
List; PDL) and secondary defect list (Seconda)
ry Defect List (SDL).

When initializing the optical disc 1, defective sectors are detected according to the slipping replacement algorithm. In this case, the detected defective sector is registered in the PDL. When recording data on the optical disc 1, defective sectors are detected according to a linear replacement algorithm. In this case, the detected defective sector is registered in the SDL. As described above, the reliability of the optical disc 1 is ensured by registering the defective sector in the PDL or the SDL.

The PDL and SDL have a defect management area (D
effect Management Area; DMA)
Is stored in Also, the disc structure definition information (Di
sk Definition Structure; D
DS) is also stored in the DMA. 4.1 Structure of DMA FIG. 4 shows the structure of the DMA. The DMA is a part of the disk information area 4 (FIGS. 2 and 3).

The DMA is an area described as DMA1 to DMA4 in the description of the layout of the disk in the ISO standard chapter 18. Of the four DMAs, two DMAs (for example, DMA1 and DMA2) are arranged in the inner disk information area 4, and two DMAs (for example,
MA3, DMA4) are arranged in the disk information area 4 on the outer peripheral side (see FIG. 3). The same information is multiplex-recorded in these four DMAs. This is to prepare for a case where a defective sector occurs in the DMA which is not a target of the replacement processing.

FIG. 4 shows two of the four DMAs.
1 shows an example in which the DMA 2 is arranged in the disk information area 4 on the inner circumference side.

DMA 1 stores DDS, PDL, and SDL. The structure of DMA2 to DMA4 is also DMA
1 has the same structure. 4.1.1 Structure of DDS FIG. 5 shows the structure of DDS.

The DDS includes a header. D in the header
An identifier or the like indicating the DS is stored. D
DS includes an entry for storing partition information, an entry for storing PDL location information, and an SD.
It further includes an entry for storing L position information and an entry for storing a physical sector number of a sector to which a logical sector number “0” (that is, LSN: 0) is assigned. 4.1.2 Structure of PDL FIG. 6A shows the structure of PDL.

The PDL includes a header and a plurality of entries (FIG. 6).
In the example shown in A, the first entry to the m-th entry) are included. The header stores an identifier indicating the PDL, the number of defective sector entries registered in the PDL, and the like. Each entry stores the physical sector number of a defective sector. 4.1.3 SDL Structure FIG. 6B shows the structure of the SDL.

The SDL has a header and a plurality of entries (FIG. 6).
B, the first to n-th entries) are included. The header stores an identifier indicating the SDL, the number of defective sector entries registered in the SDL, and the like. Each entry stores a physical sector number of a defective sector and a physical sector number of an alternative sector in which data is recorded instead of the defective sector.
SDL is different from PDL in that it has a physical sector number of an alternative sector. 4.2 Slipping / Replacement Algorithms
Arm Figure 7 is a conceptual view of a slipping replacement algorithm executed in the disc recording and reproducing apparatus 100 according to the first embodiment of the present invention (FIG. 1). In FIG. 7, a rectangle represents a sector. The symbol in the rectangle indicates the LSN assigned to that sector. A rectangle with a symbol indicates a normal sector. A hatched rectangle indicates a defective sector.

Reference numeral 71 indicates that the number of defective sectors is 1 in the PDL.
Reference numeral 72 indicates a sector column in the case where one defective sector is registered in the PDL.

If the last sector of the user area 6 is a normal sector, the last LS is added to the last sector of the user area 6.
N: m is assigned. From the sector to which the last LSN: m is assigned, the LSN is assigned to each of the plurality of sectors included in the user area 6 in descending order.

When no defective sector is registered in the PDL, LSN: m to LSN: 0 are sequentially assigned to the first sector from the last sector of the user area 6 (see the sector column 71).

If the sector to which LSN: i is assigned in the sector column 71 is a defective sector, LS
The assignment of N is changed. That is, LSN: i is not assigned to the defective sector. Instead, LSN: i is assigned to the immediately preceding sector. As a result, the allocation of the LSN slips by one sector in the direction from the user area 6 to the spare area 7. As a result, LSN: 0 is assigned to the last sector of spare area 7 (see sector column 72).

FIG. 8 shows the correspondence between the physical sector numbers and the LSNs after the execution of the slipping replacement algorithm described with reference to FIG. The horizontal axis indicates the physical sector number, and the vertical axis indicates the LSN. In FIG. 8, a dashed line 81 indicates the correspondence between the physical sector number and the LSN when there is no defective sector, and a solid line 82
Shows the correspondence between the physical sector number and the LSN when there are four defective sectors I to IV.

As shown in FIG. 8, the defective sector has L
SN is not assigned. The assignment of the LSN slips in the direction from the outer circumference to the inner circumference of the optical disc 1 (that is, the direction in which the physical sector number decreases). As a result, the LSN is allocated to some sectors of the spare area 7 arranged immediately before the user area 6.

As described above, when a defective sector is registered in the PDL, the assignment of the LSN is performed with reference to the position (fixed position) of the sector to which the final LSN is assigned from the outer periphery to the inner periphery of the optical disc 1 Slip in the direction toward. As a result, the optical disk 1
LSNs are assigned to some sectors of the spare area 7 provided on the inner peripheral side of the LSN. LS in spare area 7
The number of sectors to which N is assigned is equal to the number of defective sectors in the user area 6.

The position of the sector to which LSN: 0 is to be allocated is determined based on the position (fixed position) of the sector to which the last LSN has been allocated to a predetermined capacity (for example, 4.7 G).
It is calculated as a position that satisfies B). The position is calculated based on the number of defective sectors detected in the user area 6. LSN: 0 is assigned to the sector located at the calculated position. The predetermined capacity is:
Indicates the capacity required to secure user data as a recordable area regardless of the presence or absence of a defective sector. As described above, when a defective sector exists in the user area 6, by using a part of the spare area 7 as the user area 6, a predetermined capacity (for example, 4.7 GB) is always provided.
Can be secured.

If the last sector of the user area 6 is a normal sector, the last LSN is added to the last sector of the user area 6.
Is assigned. If the last sector of the user area 6 is a defective sector, the last LSN is assigned to the normal sector closest to the last sector.

The physical sector number of the sector to which LSN: 0 is assigned is stored in an entry in the DDS (FIG. 5). This entry is referred to when the host device 200 records data on the optical disc 1. By referring to this entry, the physical sector number corresponding to LSN: 0 can be obtained without performing calculations. As a result, it becomes possible to access the sector to which LSN: 0 is allocated at high speed.

When recording data on the optical disc 1,
The host device 200 must access the sector to which LSN: 0 is assigned. Therefore, LSN: 0
The fact that the sector to which the is assigned can be accessed at high speed is very effective in realizing high-speed access to the optical disc 1. 4.3 Linear Replacement Algorithm FIG. 9 is a conceptual diagram of a linear replacement algorithm executed in the disk recording / reproducing apparatus 100 (FIG. 1) according to the first embodiment of the present invention. In FIG.
The rectangle represents a sector. The symbol in the rectangle indicates the LSN assigned to that sector. A rectangle with a symbol indicates a normal sector. A hatched rectangle indicates a defective sector.

Reference numeral 91 indicates that the number of defective sectors is 1 in the SDL.
Reference numeral 92 indicates a sector column in a case where one defective sector is registered in the SDL.

If the sector to which LSN: i is assigned in the sector row 91 is a defective sector, LS
The assignment of N is changed. That is, LSN: i is not assigned to the defective sector. Instead, among the plurality of sectors included in the LR spare area, the LSN: i is assigned to the unused sector having the smallest physical sector number (for example, the first sector of the LR spare area) (see the sector column 92). . As described above, the defective sector in the user area 6 is replaced with the sector in the LR spare area.

LSN: i is a sector having the largest unused physical sector number among a plurality of sectors included in the LR spare area (for example, a physical sector number smaller by one than the sector to which LSN: 0 is assigned). Sector). It is not important in what order the sectors included in the LR spare area are used.

FIG. 10 shows the correspondence between the physical sector numbers and the LSNs after executing the linear replacement algorithm described with reference to FIG. The horizontal axis indicates the physical sector number, and the vertical axis indicates the LSN. In FIG. 10, a solid line 1001 shows the correspondence between the physical sector number and the LSN when there are two defective sectors.

From FIG. 10, it is understood that the distance (the number of physical sectors) between the defective sector and the replacement sector is significantly reduced as compared with the prior art (FIG. 27). 5. Operation of Disk Recording / Reproducing Apparatus 100 The disk recording / reproducing apparatus 100 performs the following operations 5.1 to 5.3 as initialization of the optical disk 1. 5.
Inspection of one disk is also called physical formatting processing, and is usually processing that is performed only once for one optical disk 1. 5.1 Disc Inspection 5.2 LSN Assignment 5.3 Recording of Initial Data of File System Thereafter, the disc recording / reproducing apparatus 100 shows the following 5.4 to 5.5 each time a file is written or read. Perform the operation. 5.4 Recording of Data (Recording of File System and File Data) 5.5 Reproduction of Data Hereinafter, these operations will be described in detail. 5.1 Disk Inspection The disk inspection is performed at least once before data is recorded on the optical disk 1. This is to guarantee the quality of the optical disc 1. However, the optical disk 1
In the case where the manufacturing technique has been improved and the number of defective sectors per optical disk 1 has been reduced to several levels, it is possible to omit the inspection of the disks for all the optical disks 1 to be shipped. This is because it is sufficient to inspect the optical disk 1 only for the sampled optical disk 1.

In the disk inspection, data of a specific test pattern is written to all sectors, and thereafter,
This is performed by reading data from all sectors. Such a disk inspection process is also called a certify process.

In the inspection of the disk, slipping
The replacement algorithm is executed. As a result, the defective sector is registered in the PDL.

FIG. 11 is a flowchart showing a procedure for inspecting a disk.

First, in step 1101, the address of the first sector of the user area 6 is set as a write address. In step 1102, it is determined whether or not the sector address has been normally read. This is because, in order to write data to a sector, it is necessary to read a sector address. Therefore, if an error occurs in reading the sector address, data cannot be written to the sector.

If it is determined in step 1102 that there is a sector address read error, the physical sector number of the defective sector is stored in the first defect list (step 1111).

If it is determined in step 1102 that there is no read error of the sector address, predetermined test data is written to the sector of the write address (step 1103).

If it is determined in step 1104 that the write address is not the last address, 1 is added to the write address (step 1105).
Thereafter, the process returns to step 1102. When the write address reaches the final address by repeating such processing, the processing proceeds to step 1106.

In step 1106, the address of the first sector of the user area 6 is set as a read address. In step 1107, the data at the read address is read. In step 1108, it is determined whether the read data is the same as the written data (that is, whether the data writing was successful).

If it is determined in step 1108 that there is a data read error, the physical sector number of the defective sector is stored in the second defect list (step 11).
12).

If it is determined in step 1109 that the read address is not the last address, 1 is added to the read address (step 1110).
Thereafter, the processing returns to step 1107, and step 11
At 08, an error determination is made. By repeating such processing, when the read address reaches the final address, the first defect list and the second defect list are set to 1
The process of combining the two lists is executed (step 111).
3) A PDL is created by sorting this list in the order of physical sector numbers (step 1114).
The PDL is recorded in the disc information area 4 together with the DDS (step 1115). 5.2 LSN Allocation LSN allocation is as described above with reference to FIG. 7 and FIG. That is, when a defective sector is registered in the PDL, the assignment of the LSN is
The optical disc 1 slips in a direction from the outer peripheral side toward the inner peripheral side of the optical disc 1 with reference to the position of the sector to which the SN is assigned (fixed position). The sector to which LSN: 0 is assigned is determined, and the physical sector number of the sector to which LSN: 0 is assigned is stored in the DDS.

FIG. 12 is a flowchart showing a procedure of processing for obtaining a physical sector number of a sector to which LSN: 0 is allocated.

As an initial setting, the physical sector number of the first sector of the user area 6 is assigned to the variable UTSN (step 1201). The value of this variable UTSN finally becomes D
DS will be written.

Next, the value of variable UTSN is substituted for variable TOP (step 1202), and the physical sector number of the last sector of the search area is substituted for variable END (step 1).
203). Here, the search area is an area in which the number of defective sectors needs to be obtained. In the first loop, the physical sector number of the first sector of the user area 6 is assigned to a variable TOP, and the physical sector number of the last sector of the user area 6 is assigned to a variable END.

The number of defective sectors included in the search area is calculated based on variable TOP and variable END (step 1204). For example, the number of defective sectors included in the search area is determined by the return value SK of the function FUNC (TOP, END).
Given as IP.

The value of the variable UTSN is subtracted by the return value SKIP. That is, UTSN = UTSN−SKIP
Is executed (step 1205). As a result, the physical sector numbers of the sectors arranged at positions skipped from the first sector of the user area 6 by the number of defective sectors included in the user area 6 can be obtained.

Steps 1202 to 1205
Is repeated until the value of the return value SKIP matches 0 (step 1206). This is to deal with the case where the sector of the spare area 7 is registered in the PDL as a defective sector.

The value of variable UTSN thus obtained indicates the physical sector number of the sector to which LSN: 0 is to be assigned. Therefore, the value of the variable UTSN is stored in the DDS as the physical sector number of the first sector of the user area (Step 1207).

FIG. 13 is a flowchart showing Step 12 shown in FIG.
14 is a flowchart showing a procedure for realizing a function FUNC (TOP, END) of No. 04. The function FUNC (TOP,
END) is realized by obtaining the number of PDL entries in the search area.

As an initial setting, a variable S indicating the number of entries
0 is assigned to KIP (step 1301), and the total number of entries read from the PDL is assigned to a variable n (step 1302).

In step 1303, it is determined whether the value of the variable n is equal to 0. If yes, the variable S
The value of KIP is returned as the return value of the function FUNC (TOP, END) (step 1308). If the total number of entries in the PDL is 0, the value 0 is returned as the value of the variable SKIP, and the process ends. If no, the process proceeds to step 1304.

The physical sector number (PDE: n) of the n-th entry is read from the PDL (step 1304).
It is determined whether PDE: n is equal to or greater than the value of the variable TOP and equal to or less than the value of the variable END (step 130).
5). If "yes", it is determined that a defective sector registered in the PDL exists in the search area, and 1 is added to the value of the variable SKIP (step 1306). "No"
If so, the process proceeds to step 1307.

The value of the variable n is subtracted by 1 (step 1).
307), the process returns to step 1303. Thus, steps 1303 to 1307 are repeated for all entries included in the PDL. As a result, the number of defective sectors in the search area is changed by the variable SKIP
Can be obtained as the value of

FIG. 14 shows an example of the LSN assigned to each sector after the inspection of the disk is completed. In the example shown in FIG. 14, the size of the user area 6 is 100,000,
The size of the spare area 7 is 10000, and the number of entries registered in the PDL in the disk inspection (that is, the number of defective sectors detected in the disk inspection) is four or four. It is assumed that it is found in the user area 6.

According to the above-described slipping replacement algorithm, an LSN is assigned to each sector.

First, the final LSN, LSN: 99
999 is assigned to the sector having the physical sector number: 109999. Next, a direction from the outer peripheral side to the inner peripheral side of the optical disc 1 (that is, from the user area 6 to the spare area 7).
LSNs are assigned to each sector in descending order. However, no LSN is assigned to a defective sector, and the LSN is assigned to the sector immediately before the defective sector. As a result, the assignment of the LSN slips in the direction from the outer circumference to the inner circumference of the optical disc 1 by the number of defective sectors.

In the example shown in FIG. 14, four defective sectors I to IV exist in the user area 6. If there is no defective sector, LSN: 0 to LSN: 3 respectively allocated to the four sectors of the user area 6 are allocated to the four sectors of the physical sector number: 9996 to 9999 of the spare area 7, respectively. . This is because the assignment of the LSN slips by the number of defective sectors (four).

The physical sector number 9996 of the sector to which LSN: 0 is assigned is recorded in the DDS as the physical sector number of the first sector of the extended user area 6.

In FIG. 14, the area of the physical area number: 0 to 9995 of the spare area 7 is described as “LR spare area”. The LR spare area is the LSN of the spare area 7.
Is defined as the unallocated area. The LR spare area is used as an alternative sector area for the linear replacement algorithm.

The physical sector number of the first sector of the LR spare area is fixed to 0. The physical sector number of the last sector of the LR spare area is a value obtained by subtracting 1 from the physical sector number recorded in the DDS. Therefore, there is almost no calculation amount of the address required to access the LR spare area. 5.3 Recording of Initial Data of File System The disk recording / reproducing apparatus 100 records the initial data of the file system on the optical disk 1 in accordance with the logical format specified by the higher-level device 200. The logical format is expressed using the LSN. The initial data is, for example, the system reservation area 11, the FAT area 12, and the root directory area 13 shown in FIG.
Refers to data recorded in the file management area 10).

The area where the initial data is recorded is managed by the host device 200 using the LSN. In particular, the first sector of the system reserved area 11 must be a sector to which LSN: 0 is assigned. Therefore, the host device 200 cannot instruct the disk recording / reproducing device 100 to record the initial data only after the LSN is determined. The contents of the initial data are determined by the host device 200.

The defect management at the time of recording the initial data is performed according to a linear replacement algorithm.
Processing at the time of recording the initial data is described in “5.4.2.
Processing for Recording Data in File Management Area 10 ". Therefore, the description is omitted here. 5.4 Data recording (file system and file data
Over recording of data) FIG. 15 is a flowchart illustrating a processing procedure for recording data on the optical disk 1. This process is a process of recording data in the file data area 14 (step 150).
1 to 1509) and a process of recording data in the file management area 10 (steps 1510 to 15)
17). 5.4.1 Record data in file data area 14
That process, first, in step 1501, the write address is set. The write address is the LSN of the first sector of the file data area 14 (recording area) to which data is to be written. This LSN is determined by the host device 200 with reference to the FAT that manages the position of the file and the free space, and is sent to the disk recording / reproducing device 100.

FAT, prior to writing data,
The data is read from the optical disk 1 by the disk recording / reproducing apparatus 100 and stored in the main memory 204 of the host apparatus 200. The CPU 201 executes the F stored in the main memory 204.
By referring to the AT, the L of the first sector of the recording area is obtained.
Determine the SN. The determined LSN is stored in the memory 1 in the disc recording / reproducing apparatus 100 together with the recording instruction command.
04. The microprocessor 101 performs the following steps based on the LSN stored in the memory 104.

In step 1502, it is determined whether or not the sector address has been normally read. This is because, in order to write data to a sector, it is necessary to read a sector address. Therefore, if an error occurs in reading the sector address, data cannot be written to the sector.

If it is determined in step 1502 that there is an error in reading the sector address, replacement processing for replacing the defective sector with a normal sector in the LR spare area (FIG. 14) is performed (step 1508).

If it is determined in step 1502 that there is no error in reading the sector address, data is written to the sector of the file data area 14 specified by the LSN (step 1503). Data is,
The data is sent from the I / O bus 205 of the host device 200, buffered in the memory 104, and stored in the file data area 14
Is written to.

At step 1504, a verify process is executed. The verify processing reads the data from the sector in which the data was written in step 1503, compares the read data with the written data, performs an operation using an error correction code, and the like, to thereby write the data. This is a process for confirming whether or not the process has succeeded.

If it is determined in step 1505 that there is a data read error, replacement processing for replacing a defective sector with a normal sector in the LR spare area (FIG. 14) is performed (step 1509).

If it is determined in step 1506 that the data to be recorded is not completed, the write address is set to the next LSN (step 15).
07). Thereafter, the process returns to step 1502. When it is determined that the data to be recorded has been completed by repeating such processing, the processing for recording the data in the file data area 14 ends.

FIG. 16 is a flowchart showing Step 15 shown in FIG.
It is a flowchart which shows the procedure of the substitution process performed in 08,1509.

In step 1601, a sector to which no LSN is assigned among the sectors in the spare area 7 (ie, a sector in the LR spare area) is assigned to a substitute sector.

In step 1602, data that would have been recorded in a defective sector is recorded in a substitute sector.
Note that, although omitted in FIG. 16, when writing data to the substitute sector, step 1502 shown in FIG.
To Step 1509 are executed. If an error is detected when writing data to the replacement sector, another sector in the LR spare area is assigned to the replacement sector.

At step 1603, the physical sector number of the defective sector and the physical sector number of the replacement sector are registered in the SDL. As a result, the defective sector is associated with the substitute sector used in place of the defective sector.

Here, every time the processing in step 1603 is executed, the optical disc 1 is not accessed to update the SDL. In step 1603, the physical sector number of the defective sector and the physical sector number of the replacement sector are registered in the defect list stored in the memory 104. After it is determined in step 1506 in FIG. 15 that the data to be recorded has been completed, an SDL is created and recorded in the disc information area 4. In this way, the processing time is reduced by minimizing the number of accesses to the optical disk 1. 5.4.2 Recording Data in File Management Area 10
After the processing for recording the processing data in the file data area 14 ends, the processing for recording the data in the file management area 10 is executed. This is because the management data such as the FAT is updated by the process of recording the data in the file data area 14, and the updated management data needs to be recorded in the file management area 10.

The process of recording data in the file management area 10 (steps 1510 to 1517) is a process of recording data in the file data area 14 except that the contents of the data and the recording area are different (steps 1501 to 1501). 1509). Therefore, detailed description is omitted here.

FIG. 17 shows the correspondence between the physical sector numbers and the LSNs after executing the slipping replacement algorithm and the linear replacement algorithm. The horizontal axis indicates the physical sector number, and the vertical axis indicates L
Indicates SN. In FIG. 17, a chain line 1701 indicates the correspondence between the physical sector number and the LSN when there is no defective sector, and a solid line 1702 indicates that there are four defective sectors registered in the PDL and the defective sector registered in the SDL. Shows the correspondence between physical sector numbers and LSNs when there are two.

The example shown in FIG. 17 shows a case where two defective sectors are detected when data is recorded in the file management area 10. These two defective sectors are replaced by replacement sectors of the LR spare area in the spare area 7.

The file management area 10 is arranged in an area starting from LSN: 0. From FIG. 17, it can be seen that the distance between the defective sector in the file management area 10 and the replacement sector in the spare area 7 is significantly reduced as compared with the related art (FIG. 27). For example, the distance (the number of physical sectors) between the defective sector in the file management area 10 and the replacement sector in the spare area 7 is 100,000 according to the related art (FIG. 27).
In contrast to the number of sectors, the number of sectors is about 10,000 according to the present embodiment (FIG. 17). This improves the access speed to the optical disc 1. 5.5 Reproduction of Data When reproducing data, the higher-level device 200 searches for a file position by referring to management data such as FAT. The host device 200 instructs the disk recording / reproducing device 100 to access the file management area 10 in order to refer to the management data. The disc recording / reproducing device 100
The sector to which LSN: 0 is assigned is always accessed. The physical sector number of that sector is recorded in the DDS. Therefore, the disk recording / reproducing apparatus 100
Can access a sector to which LSN: 0 is allocated at high speed by referring to the DDS.

The host device 200 stores the file data area 1
4 is instructed to the disk recording / reproducing apparatus 100 using the LSN. Disk recording / reproducing device 10
0 refers to the PDL and SDL, and
To convert the LSN specified by
Data is read from the sector of the physical sector number.

As described above, in the first embodiment of the present invention, the spare area 7 is arranged on the inner peripheral side of the optical disc 1 with respect to the user area 6. The LSN assignment is the final L
This is achieved by slipping in a direction from the outer peripheral side to the inner peripheral side of the optical disc 1 with reference to the position (fixed position) of the sector to which the SN is assigned. First LSN
The position of the sector to which (LSN: 0) is assigned is DD
Recorded in S.

The last LSN is not always allocated to the last sector of the user area 6. If the last sector of the user area 6 is a defective sector, the last LSN is assigned to a normal sector closest to the last sector among the sectors included in the user area 6.

In the first embodiment of the present invention, defect management is performed in units of sectors. However, defect management may be performed in units of blocks including a plurality of sectors. In this case, instead of registering a physical sector number in PDL and SDL, a block number may be registered. The unit for performing defect management may be any unit. An effect similar to the above-described effect can be obtained without depending on the unit for performing the defect management.

The host apparatus 200 and the disk recording / reproducing apparatus 100 are connected via the I / O bus 205.
There is no limitation on the form of connection with the device. As long as commands and data can be transmitted and received, the host device 200 and the disk recording / reproducing device 100 can be connected in any connection manner (for example, wired or wireless). Disc recording / reproducing device 1
The same applies to the connection between the components in 00.

(Embodiment 2) An AV file (Audio Visual Da) where real-time property is regarded as important
ta File: a defect management method suitable for temporally continuous video and audio data files). This defect management method is a method in which, when an AV file is recorded on the optical disc 1, defect management is performed using a file system managed by a higher-level device 200 without performing substitution processing based on a linear replacement algorithm. is there. This defect management method is described in, for example, International Publication No. WO98 / 14938 by Goto et al.

An example in which the defect management method of the present invention is applied to an AV file system will be described below.

The configuration of the information processing system is as shown in FIG. The physical structure of the optical disc 1 is as shown in FIG. The logical structure of the optical disc 1 is as shown in FIG. Here, the file system corresponds to the first embodiment.
Although the file management area 10 is different from the MS-DOS file system described above, the point that the file management area 10 is located in the fixed LSN of the user area 6 is common. 6. Operation of Disc Recording / Reproducing Apparatus 100 The disc recording / reproducing apparatus 100 performs the following operations 6.1 to 6.3 as initialization of the optical disc 1. 6.1 Disc Inspection 6.2 LSN Allocation 6.3 Recording of Initial Data of File System Thereafter, the disc recording / reproducing apparatus 100 shows the following 6.4 to 6.5 every time a file is written or read. Perform the operation. 6.4 Recording of Data (Recording of File System and File Data) 6.5 Reproduction of Data The operations of 6.1, 6.2, 6.3, and 6.5 are described in 5.1 described in the first embodiment. , 5.2, 5.3, 5.5. Therefore, the description is omitted here. 6.4 Data recording (file system and file data
Recording) diagram over data 18 is a flowchart showing a procedure of processing for recording the AV file in the optical disk 1. This processing is performed by AV
Processing for recording a file in the file data area 14 (steps 1801 to 1809) and processing for recording an AV file in the file management area 10 (step 18)
10 to step 1817). 6.4.1 AV file in file data area 14
The high-level processing apparatus 200 for recording records the AV
Issue a file recording command. The disc recording / reproducing apparatus 100 receives the AV file recording command,
A process for recording the V file in the file data area 14 is executed.

The processing for recording the AV file in the file data area 14 (FIG. 18) is performed in steps 1808 and 180
9 is the same as the process of recording data in the file data area 14 (FIG. 15).

At step 1808, the area including the defective sector is registered as a defective area in the file management information.

At step 1809, a free area following the defective area is set. Thereafter, the process proceeds to step 1802
Return to

As described above, the disc recording / reproducing apparatus 100
Does not perform the substitution process even if a defective sector is detected when an AV file recording command is received.

FIG. 19 is a diagram for explaining the data recording area 5 after recording the AV file.

It is assumed that an AV file “V1.MPG” (hereinafter referred to as “V1.MPG file”) is recorded in the file data area 14 and a defective sector is detected during recording of the AV file. In FIG. 19, a defective area including a defective sector is indicated by a hatched rectangle. In FIG. 19, A1, A2, and A3 are respectively
The head LSN of each area is shown, and L1, L2, and L3 indicate the length of each area, respectively. The first LSN of the defective area is A
2, and the length of the defective area is L2.

V1. The MPG file is stored in the FAT area 12
Is managed by a file management table stored in the. The file management table is stored in the V1. It is linked from the file entry of the MPG file.

The file management table stores the head LSN and length of the area where the AV file is located. The file management table further stores attribute data for identifying whether the area is a data recorded area or an unrecorded defective area. In step 1808 shown in FIG. 18, attribute data of an area having a length L2 starting from LSN: A2 is set in an unrecorded defect area. Thus, at the time of reproduction, it can be determined that this area is a defective area. As a result, the reproduction of the defective area is skipped.

In the example shown in FIG. 19, the file management table contains V1. Information on three areas related to the MPG file is stored. The file management table of FIG. 19 includes an area of length L1 starting from LSN: A1 and LS
Data is recorded in the area of length L3 starting from N: A3, and no data is recorded in the area of length L2 starting from LSN: A2.

Thus, the file management table contains L
It is possible to identify a defective area based on SN.
V1. When reproducing the MPG file, it is possible to continuously reproduce the AV file by skipping the defective area.

Note that recording based on the AV file recording command is performed in units of blocks in which a plurality of sectors constitute one block. Therefore, information stored in the FAT area 12 and the root directory area 13 also becomes a block address. This is because the size of the AV file is large. By managing data in units of blocks, the management information of the file system is reduced in size. Recording in block units can be realized by repeating recording in sector units a plurality of times. Therefore, the basic operation of the disc recording / reproducing apparatus 100 is the same as the above-described operation. 6.4.2 Write AV File in File Management Area 10
The process of recording an AV file in the file management area 10 (FIG. 18) is the same as the process of recording data in the file management area 10 (FIG. 15). That is, when a defective sector is detected when recording the AV file in the file management area 10, the substitution process is performed in steps 1816 and 1817. This is because it is logically impossible to manage a defective sector detected from the file management area 10 in which the file management table is stored by using the file management table.

When data such as computer data for which real-time property is not regarded as important (hereinafter referred to as a PC file) is recorded on the optical disc 1, the host device 200 transmits a PC file recording command to the disc recording / reproducing device 100. Issue. The operation of the disc recording / reproducing apparatus 100 in this case is the same as the above-described operations of 5.1 to 5.5.

As described above, according to the second embodiment of the present invention, a defect management method suitable for recording an AV file is provided.

(Third Embodiment) Like a DVD-RAM disk, a spare area and a user area are divided into a plurality of zones, and in a ZCLV type information recording medium in which the number of disk revolutions in each zone is different, a zone boundary is formed on a zone boundary. A guard area is provided.

FIG. 20 shows the physical structure of an optical disk 1a having two zones. Zone 0 is provided on the inner peripheral side of the optical disk 1a, and zone 1 is provided on the outer peripheral side from the zone boundary of the optical disk 1a. Guard area 2
001 is provided so as to straddle both zone 0 and zone 1 with the zone boundary 2002 interposed therebetween. The guard area 2001a on the zone 0 side and the guard area 2001b on the zone 1 side each include one or more tracks.

The guard area 2001 is the zone boundary 200
Since tracks having different track structures are included between them, the signal quality is poor and they are not suitable for recording. For this reason,
The guard area 2001 is set as an area where data is not recorded. The location of these zones and guard areas,
The size is uniquely determined depending on the optical disk 1a, and is fixed.

Note that the configuration of the information processing system is as shown in FIG. The logical structure of the optical disk 1a is
This is the same as the logical structure of the optical disc 1 shown in FIG.

FIG. 21 shows the physical sector numbers and LSs after the execution of the slipping replacement algorithm.
The correspondence with N is shown. The horizontal axis indicates the physical sector number,
The vertical axis indicates LSN. In FIG. 21, a dashed line 210
1 indicates the correspondence between the physical sector number and the LSN when there is no defective sector, and the solid line 2102 indicates the correspondence between the physical sector number and the LSN when there are four defective sectors.

As shown in FIG. 21, no LSN is assigned to a defective sector. The assignment of the LSN slips in a direction from the outer circumference to the inner circumference of the optical disc 1a (that is, a direction in which the physical sector number decreases). This is the same as in the first and second embodiments.

Furthermore, as shown in FIG. 21, no LSN is assigned to guard area 2001. The assignment of the LSN is performed so that the LSN is continuous at both ends of the guard area 2001. Thus, the guard area 2001
No data is recorded on the

The file management area 1 having the spare area 7 and the sector to which LSN: 0 is assigned as the first sector.
0 are arranged in the same zone. As a result, the replacement processing of the defective sector detected when recording data in the file management area 10 is sufficient with access within a single zone.
No seek operation is required across zones.

In a DVD-RAM disk, since the error correction code is calculated over a plurality of sectors, the plurality of sectors are defined as one block. For example, E
A CC block is composed of 16 sectors. In such a case, the design is made such that a multiple of the block size is equal to the size of each zone. However, according to the slipping replacement algorithm, L
When the SN is assigned, one block may be arranged in two zones across the guard area 2001 depending on the number of detected defective sectors. This is because the number of LSNs assigned to each zone changes depending on the number of defective sectors.

FIG. 22A shows a disk recording / reproducing apparatus 100.
It is a conceptual diagram of the slipping replacement algorithm performed in (FIG. 1). In FIG. 22A, a rectangle represents a sector. The symbol in the rectangle indicates the LSN assigned to that sector. A rectangle with a symbol indicates a normal sector. A hatched rectangle indicates a defective sector.
In the example shown in FIG. 22A, an ECC block for calculating an error correction code is composed of 16 consecutive sectors. However, the number of sectors constituting the ECC block is not limited to 16. An ECC block may be composed of any number of sectors.

Reference numeral 2201 indicates a sector column when no defective sector exists, and reference numeral 2202 indicates a sector column (no block correction) when one defective sector exists in zone 1. Reference number 2203 is zone 1
Shows a sector row (with block correction) when there is one defective sector.

When the last sector of zone 1 is a normal sector, the last LSN: m is assigned to the last sector of zone 1. From the sector to which the last LSN: m is assigned, the LSN is assigned to each of the plurality of sectors included in the user area 6 in descending order.

If there is no defective sector, LSN: m to L
SN: 0 are sequentially assigned (see sector column 2201).

In the case where the sector to which LSN: i is assigned in the sector row 2201 is a defective sector,
The LSN assignment is changed. That is, LSN: i is not assigned to the defective sector. Instead, LSN: i is assigned to the immediately preceding sector. As a result, the allocation of the LSN slips by one sector in the direction from the user area 6 to the spare area 7. As a result, LSN: 0 is assigned to the last sector of spare area 7 (see sector column 2202).

In the sector column 2202, LSN: k to LS
An ECC block to which N: k + 15 is allocated is arranged over zone 0 and zone 1. One E
In order to prevent the CC block from being arranged over two or more zones, block correction is performed on the sector row.

The sector row 2203 shows the result of performing block correction on the sector row 2102. Sector column 22
02 has one defective sector in zone 1. In this case, the sector row 2203 is obtained by slipping the sector row 2202 by 15 (= 16-1) sectors in the direction from the user area 6 to the spare area 7.

As described above, when a defective sector exists in the user area 6, block correction of LSN allocation is performed so that the head sector of each zone coincides with the head sector of an ECC block. This prevents one block from being arranged over a plurality of zones. As a result, there is no access over a plurality of zones when recording / reproducing one block. This makes it possible to reduce the time for the recording / reproducing process. In addition, 1
Since the data of the block can be read continuously, it is possible to reduce the number of calculation memories and arithmetic devices required for the preliminary pipeline processing without disturbing the pipeline processing of the error correction processing calculation.

FIG. 22B shows the physical sector number and L after executing the slipping replacement algorithm.
The correspondence with SN is shown. The horizontal axis indicates the physical sector number, and the vertical axis indicates the LSN. The dashed line 2211 in FIG. 22B
Is the same as the dashed line 2101 in FIG. FIG. 22B
21 is the same as the solid line 2102 in FIG.

Here, it is assumed that one block is arranged across the guard area 2001 as a result of the assignment of the LSN indicated by the broken line 2212 in FIG. 22B. That is, it is assumed that the first half of the block is located in zone 0 and the remaining second half (fraction of the block) is located in zone 1.

In this case, the assignment of the LSN is performed in the direction in which the LSN increases by the fraction of the block arranged in the zone 1. As a result, all the blocks straddling the guard area 2001 are arranged in the zone 0, and the first sector of the next block is arranged in the sector immediately after the guard area 2001 in the zone 1. The head of the block can always be arranged in the recordable head sector in each zone.

The solid line 2213 in FIG. 22B shows the result of LSN assignment. By the LSN assignment, the LSN corresponding to the fraction of the block is assigned to the sector in zone 0. Thus, the solid line 22 in FIG.
By performing LSN assignment as shown in FIG.
Blocking over the guard area 2001 is eliminated.

In the optical disk 1a, the position of the sector to which LSN: 0 is to be allocated is a position satisfying a predetermined capacity (for example, 4.7 GB) with reference to the position (fixed position) of the sector to which the last LSN is allocated. Is calculated as The position is calculated based on the number of defective sectors detected in each of the plurality of zones. LSN: 0 is assigned to the sector located at the calculated position.
Is assigned. The physical sector number of the sector to which LSN: 0 is assigned is stored in an entry in the DDS.

The logical sector number (LSN) assigned to the first sector of each zone is stored in an entry in the DDS. By storing the logical sector number (LSN) assigned to the head sector of each zone in the DDS, it is possible to access the head sector of each zone at high speed without calculation.

FIG. 22C shows the structure of the DDS. DDS
Has an entry for storing a logical sector number (LSN) assigned to the first sector of each zone. The number of its entries is equal to the number of zones. For example, when the optical disk 1a has two zones (zone 0 and zone 1), the DDS includes an entry for storing the LSN allocated to the first sector of zone 0, and the first sector of zone 1 And an entry for storing the LSN assigned to the.

As described above, according to the third embodiment of the present invention, a defect management method for an optical disk having a plurality of zones is provided. Further, there is provided a defect management method in which blocks are not arranged across a guard area when recording is performed in units of blocks.

In the third embodiment, the number of zones is described as 2. However, the number of zones may be 3 or more. Also in this case, it is possible to allocate the LSN so that the head of the block is arranged in the recordable head sector in each zone.

[0189]

According to the information recording medium of the present invention, the spare area is arranged on the inner peripheral side of the information recording medium from the user area. When a defective sector is detected in the file management area located near the logical sector number “0” (LSN: 0), the defective sector is replaced with a spare sector replacement sector according to a linear replacement algorithm. Since the distance between the defective sector and the substitute sector is small, the access delay due to the defective sector is small. Since the frequency of access to the file management area is high, the frequency of occurrence of defective sectors in the file management area is high. Therefore, reducing the access delay due to the defective sector has a great effect on shortening the time of the recording / reproducing process.

The logical sector number “0” (LSN:
The physical sector number of the sector to which (0) is assigned is recorded in the disk information area. Alternate regions (LR) used in the linear replacement algorithm
The physical sector number of the first sector of the spare area is fixed. The physical sector number of the last sector of the LR spare area is obtained by subtracting 1 from the physical sector number recorded in the disk information area. Therefore, by referring to the physical sector number recorded in the disk information area, the position of the LR spare area can be obtained with almost no calculation.

When the area of the information recording medium is divided into a plurality of zones, a defective sector detected in the file management area and a substitute sector for the defective sector are arranged in the same zone. Therefore, in the access to the file management area, access across a plurality of zones does not occur. This makes it possible to reduce the time for the recording and reproduction processing.

Further, when recording / reproducing is performed in block units, the head of a block is arranged in a recordable head sector in each zone. Access over a plurality of zones does not occur during recording / reproducing of one block. This makes it possible to reduce the time for the recording and reproduction processing. In addition, since one block of data can be read continuously, it is possible to reduce the number of calculation memories and arithmetic devices required for the preliminary pipeline processing without disturbing the pipeline processing of the error correction processing calculation.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an information processing system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a physical structure of the optical disc 1;

FIG. 3 is a diagram showing a logical structure of the optical disc 1;

FIG. 4 is a diagram showing a structure of a DMA.

FIG. 5 is a diagram showing the structure of a DDS.

FIG. 6A is a diagram showing a structure of a PDL.

FIG. 6B is a diagram showing a structure of an SDL.

FIG. 7 is a conceptual diagram of a slipping replacement algorithm of the present invention.

FIG. 8 is a diagram showing the correspondence between physical sector numbers and LSNs.

FIG. 9 is a conceptual diagram of a linear replacement algorithm according to the present invention.

FIG. 10 is a diagram showing the correspondence between physical sector numbers and LSNs.

FIG. 11 is a flowchart showing a procedure for inspecting a disk.

FIG. 12 is a flowchart illustrating a procedure of a process for obtaining a physical sector number of a sector to which LSN: 0 is assigned.

FIG. 13 shows a function FUNC (TOP, E,
9 is a flowchart illustrating a procedure for implementing ND).

FIG. 14 is a diagram illustrating an example of an LSN assigned to each sector after the inspection of the disk is completed.

FIG. 15 is a flowchart showing a procedure of a process for recording data on the optical disc 1;

FIG. 16 shows steps 1508 and 150 shown in FIG.
9 is a flowchart illustrating the procedure of an alternative process executed in Step 9.

FIG. 17 is a diagram showing the correspondence between physical sector numbers and LSNs.

FIG. 18 is a flowchart showing a procedure of a process for recording an AV file on the optical disc 1.

FIG. 19 is a diagram for explaining a data recording area 5 after recording an AV file.

FIG. 20 is a diagram showing a physical structure of an optical disc 1a having two zones.

FIG. 21 is a diagram showing the correspondence between physical sector numbers and LSNs.

FIG. 22A is a conceptual diagram of a slipping replacement algorithm of the present invention.

FIG. 22B is a diagram showing the correspondence between physical sector numbers and LSNs.

FIG. 22C is a diagram showing a structure of a DDS.

FIG. 23 is a diagram showing a logical structure of a conventional optical disc.

FIG. 24 is a conceptual diagram of a conventional slipping replacement algorithm.

FIG. 25 is a diagram showing the correspondence between physical sector numbers and LSNs.

FIG. 26 is a conceptual diagram of a conventional linear replacement algorithm.

FIG. 27 is a diagram showing the correspondence between physical sector numbers and LSNs.

FIG. 28 is a diagram illustrating an example of an LSN assigned to each sector.

[Explanation of symbols]

 1, 1a optical disk 2 track 3 sector 4 disk information area 5 data recording area 6 user area 7 spare area 10 file management area 11 system reserved area 12 FAT area 13 root directory area 14 file data area

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 20/18 552 G11B 20/18 552A 570 570G 572 572C 572F (72) Inventor Hiroshi Ueda 1006 Odoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Nohisa Fukushima 1006 Ojidoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] 1. A disk information area, a user area including a plurality of sectors, and at least one sector that can be used when at least one of the plurality of sectors included in the user area is a defective sector. An information recording medium including a spare area, wherein the spare area is arranged on an inner peripheral side of the information recording medium with respect to the user area, and the plurality of sectors included in the user area and the spare area Among them, the physical sector number of the sector to which the logical sector number “0” is assigned is recorded in the disk information area, and the sector other than the defective sector included in the user area has the final logical sector number. Logical sector numbers are assigned in descending order from the assigned sector, and the data recorded in the file management area is the logical sector number. Information recording medium Kuta number "0" is recorded as the top sector assigned. 2. A disk information area, a user area including a plurality of sectors, and at least one sector that can be used when at least one of the plurality of sectors included in the user area is a defective sector. An information recording medium including a spare area, wherein the spare area has a smaller physical sector number than the user area, and the logical area among the plurality of sectors included in the user area and the spare area is The physical sector number of the sector to which the sector number “0” is assigned is recorded in the disk information area. Sectors other than the defective sector included in the user area include, from the sector having the higher physical address, the physical address of the physical address. Logical sector numbers are assigned in descending order to smaller sectors, and are recorded in the file management area. Over the information recording medium data is to be recorded as the beginning of a sector in which the logical sector number "0" is assigned. 3. A disk information area, a user area including a plurality of sectors, and at least one sector that can be used when at least one of the plurality of sectors included in the user area is a defective sector. A spare area, wherein the spare area is a defect management method for an information recording medium arranged on an inner peripheral side of the information recording medium with respect to the user area. Assigning the last logical sector number to one of the sectors; (b) detecting a defective sector included in the user area; and (c) determining the sector to which the last logical sector number has been assigned. Calculating, based on the position, a position satisfying a predetermined capacity based on the number of the detected defective sectors; and (d) calculating the calculated position. Assigning a logical sector number “0” to the sector located at the position; (e) recording the physical sector number of the sector to which the logical sector number “0” is assigned in the disk information area; (F) recording the data to be recorded in the file management area starting from the sector to which the logical sector number “0” is assigned. 4. A disk information area, a user area including a plurality of sectors, and at least one sector that can be used when at least one of the plurality of sectors included in the user area is a defective sector. A spare area, wherein the spare area is a defect management method for an information recording medium having a smaller physical sector number than the user area, and (a) the plurality of sectors included in the user area (B) detecting a defective sector included in the user area; and (c) referring to the position of the sector to which the final logical sector number has been assigned. From the sector having the higher physical address to the sector having the lower physical address, based on the number of the detected defective sectors, Calculating a position that satisfies a predetermined capacity; (d) assigning a logical sector number “0” to a sector located at the calculated position; and (e) assigning the logical sector number “0”. Recording the physical sector number of the sector in the disk information area; and (f) recording the data to be recorded in the file management area starting from the sector to which the logical sector number “0” is assigned. Includes defect management methods. 5. A disk information area, a user area including a plurality of sectors, and at least one sector that can be used when at least one of the plurality of sectors included in the user area is a defective sector. A spare area, wherein the spare area is a defect management device for the information recording medium which is arranged on the inner peripheral side of the information recording medium with respect to the user area, wherein the defect management device executes a defect management process. The defect management processing includes: (a) assigning a final logical sector number to one of the plurality of sectors included in the user area; and (b) detecting a defective sector included in the user area. (C) based on the number of the detected defective sectors with reference to the position of the sector to which the final logical sector number has been assigned; Calculating a position that satisfies a predetermined capacity; (d) assigning a logical sector number “0” to the sector located at the calculated position; and (e) assigning the logical sector number “0”. Recording the physical sector number of the sector in the disk information area; and (f) recording the data to be recorded in the file management area starting from the sector to which the logical sector number “0” is assigned. Includes defect management equipment. 6. A disk information area, a user area including a plurality of sectors, and at least one sector that can be used when at least one of the plurality of sectors included in the user area is a defective sector. A spare area, wherein the spare area is a defect management device for an information recording medium having a smaller physical sector number than the user area, wherein the defect management device executes a defect management process; (A) assigning a final logical sector number to one of the plurality of sectors included in the user area; and (b) detecting a defective sector included in the user area. (C) With reference to the position of the sector to which the last logical sector number has been assigned, the sector having the higher physical address Calculating a position that satisfies a predetermined capacity based on the number of the detected defective sectors toward the first sector; and (d) assigning a logical sector number “0” to the sector located at the calculated position. (E) recording the physical sector number of the sector to which the logical sector number “0” has been allocated in the disk information area; and (f) data to be recorded in the file management area is the logical sector number. Recording the sector with the sector number “0” assigned as the head. 7. A reproducing apparatus for reproducing the information recording medium according to claim 1. 8. A recording device for recording the information recording medium according to claim 1.