JP2004118967A - Optical disk defect processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high speed and optimum defect processing device for converting a specified logic sector address into the sector address of an actual optical disk. <P>SOLUTION: When an expected physical address is a defective sector, the defect processing device judges whether the next physical address also is a defective sector or not from an entry table of the defective sector, the processing is stopped at a prescribed number of times, by retrieving the residual with two branches, the number of times of accesses of the entry table of the defective sector is reduced, and defect processing can be performed at a high speed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk device for reproducing data recorded on an optical disk.
[0002]
[Prior art]
In an optical disk device that handles a rewritable optical disk, when an unreadable / writable area on the optical disk, that is, a defective sector exists, and the defective sector is registered on the optical disk, the defective sector is skipped and a normal sector is read. Have to read and write to it. Among the defective sectors, those having an alternative destination (area for reading and writing data instead of the defective sector) immediately after the defective sector are referred to as an initial defect (PDL: Primary Defect List). However, immediately after that, in the case of a defective sector, reading and writing are performed on the next normal sector. In addition to the initial defect, a secondary defect list (SDL: Secondary Defect List) for reading and writing in a predetermined replacement sector when a defective sector is found, and an optical disc in which the replacement area or the optical disc is zoned, have no zone boundary. It is necessary to skip the used area.
[0003]
However, when reading and writing data from a host such as a computer, data to be accessed is specified by a logical sector address (LBA: Logical Block Address) with respect to the optical disk device. It is necessary to convert the requested LBA into an actual physical address (PBA: Physical Block Address) on the optical disk.
[0004]
As a method for reading and writing the defective sector, the conventional method calculates the PBA by considering the requested LBA specified by the host in consideration of the PDL, the SDL, the spare area, and the zone boundary.
[0005]
To be more specific, from the head LBA of each zone registered on the optical disc (this is recorded as defect information in a predetermined area of the optical disc), it is checked in which zone the requested LBA exists. Next, an offset value between the head LBA of the zone where the request data exists and the request LBA is calculated. Next, the offset value calculated above is added to the head PBA of each zoned zone (this depends on the standard of the optical disc), and this zone corresponds to a request LBA in which PDL and SDL are not considered. The expected value of PBA can be calculated.
[0006]
However, since PDL and SDL are not considered in this case, first, the head PBA of the zone where the requested LBA exists and the number of PDL sectors up to the expected value of the PBA are checked, and the expected value of the PBA is added by the number of sectors. I do. Next, the PBA expected value before the addition and the number of PDL sectors up to the PBA expected value after the addition are checked, further added to the expected value of the PBA, and repeated until the added value of the PDL becomes zero. If the expected value of the PBA when the added value becomes 0 is not entered in the SDL, the PBA is set as the PBA to be obtained if the PBA is found in the SDL.
[0007]
In this case, it is necessary to perform PDL entry defect processing one sector at a time. However, since the host often requests a plurality of sectors or a continuous logical address at a time, when performing the PDL defect processing, the PDL entry number after the defect processing and the PDL after considering the PDL are considered. The physical address is held, and in the next logical address, the value obtained by incrementing the physical address in consideration of the PDL and the defective address indicated by the PDL entry entry No. are found. When a defective sector is continuous such as when a sector is checked, the expected physical address and the PDL entry number are incremented by one, and the expected physical address and the physical address indicated by the PDL entry number are incremented. The physical address at the time of no match is the one in consideration of PDL. The address (see FIG. 9).
[0008]
However, according to such a method, when a continuous physical address is registered in the PDL, it takes a lot of time in PDL defect processing.
[0009]
In addition, since these defective sectors are prepared as tables, they are grouped together, arranged in ascending order of physical addresses, and a new table storing identification information and the coefficient of the same defect for each physical address is prepared. There is also one that prepares and uses it to convert LBA to PBA (see Patent Document 1).
[0010]
As described above, in converting the LBA to the PBA, in the conventional method, when the entries of the PDL are too continuous, the conversion of the PBA requires a large amount of time. In the above, the defect processing of the PDL may become a bottleneck of the processing time, and the processing may be broken.
[0011]
[Patent Document 1]
JP-A-11-126336
[0012]
[Problems to be solved by the invention]
As described above, when converting a request LBA specified by a host computer or the like into an actual PBA, a large amount of time is required for defect processing when PDL entries are continuous.
[0013]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problem and to optimally reduce the conversion processing time from LBA to PBA when defects continue in any state.
[0014]
[Means for Solving the Problems]
Reading means for reading defect information recorded in a predetermined area of the optical disc;
Storage means for storing the defect information read by the reading means,
Control means for performing control to convert a specified logical address into a physical address using the defect information stored by the storage means,
The control means compares the defective physical address of the defect information with an expected value when a logical address specified by a host is converted into a physical address, and returns an expected value of the physical address when they do not match, and ends. If there is a match, the value obtained by incrementing the expected value of the physical address is compared with the defect address entered next to the address of the matching defect information, and if there is no match, the physical address is returned and the processing is terminated. When they match, the process of comparing the value obtained by further incrementing the expected value of the physical address with the defect address entered next to the address of the defect information is repeated up to a predetermined number. Where a defective entry is interrupted by a two-branch search from the information, that is, a defective sector of a logical address specified by the host is skipped. By returning a physical address in consideration of the defect information from a designated logical address, even when defective sectors are continuously present, access to the defective sector table is minimized, and LBA is quickly converted to PBA. Can be converted.
[0015]
The defective sector referred to here is generally called an initial defective sector (PDL: Primary Defect List), and the replacement destination is a valid sector immediately after the defective sector. In addition, since the host often designates a continuous logical address, it is possible to know the entry number near the requested LBA by looking at the defective sector table. Further, when the number matches the defective sector table, the expected value of the physical address is incremented up to a predetermined number of times to check whether the defective sector is continuous. The table is referred to once, and, for example, even when 1000 or more defective sectors continue, and then there are 1000 more defective sectors, whether or not the defective sectors are continuous a predetermined number of times is incremented and checked. After that, in order to check where the defective sector is interrupted in two branches from the coincident defective sector entry number to the end of the defective sector entry, (predetermined number of times) +11 times (2 to the power of 11 is 2048). Access to the defective sector table is much reduced and processing time is much longer than 1000 or so. It can be reduced to.
[0016]
Reading means for reading defect information recorded in a predetermined area of the optical disc;
Storage means for storing the defect information read by the reading means,
Control means for controlling conversion of a specified logical address to a physical address using the defect information stored by the storage means, wherein the storage means adds continuous information of the defective physical address of the defect information. To do
When the control means does not match the expected value when the logical address specified as the defective physical address of the defect information is converted to a physical address without considering the defective sector, the physical address is returned and the processing is terminated. When a match occurs, the continuous information is used to return a physical address obtained by adding a number corresponding to the continuous number, so that access to the defective sector table can be reduced even when defective sectors are continuously present, and LBA can be performed at high speed. Can be converted to PBA.
[0017]
Further, using a reading means for reading defect information recorded in a predetermined area of the optical disk, a storage means for storing the defect information read by the reading means, and using the defect information stored by the storage means, Control means for performing control for converting a specified logical address to a physical address, wherein the storage means continuously increases the maximum size when the information on the number of consecutive defective physical addresses of the defect information exceeds a predetermined size. If it does not match the expected value when the control means converts the defect physical address of the defect information and the specified logical address into a physical address, the control means returns the expected value of the physical address and terminates. When they match, the expected value of the physical address added by the continuous number information is compared with the defect information ahead of the continuous number information by using the continuous number information. , And returning the expected value of the physical address when there is no more match, the access to the defective sector table can be reduced even when defective sectors exist continuously, and the LBA can be converted to the PBA at high speed. Can be converted.
[0018]
In addition, since this method limits the number-of-consecutive-times information on defective sectors, the area for storing the number-of-consecutive-times information can be small, and can be realized, for example, even in an empty area in the defective sector table. The preparation of the continuous number information of the defective sector entry in the storage means is a process to be performed in advance in the optical disk device. When the continuous number information of the entry is the initial value, if the increment is performed one by one as in the related art and the check is performed, only the increment is performed one by one and the continuous number is checked as in the conventional method. When there is enough time, it is possible to prepare continuous number information of defective sector entries, which can contribute to shortening of the time until the start of access at the time of initial reading / writing / reading of the optical disk.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention.
[0020]
(Embodiment 1)
FIG. 1 is a block diagram of an optical disk device according to Embodiments 1, 2, and 3 of the present invention.
[0021]
An optical disk device 100 receives a data request from the host 120, reads data from the optical disk 101, and transfers the data to the host 120. Reference numeral 101 denotes an optical disk, which is formed by coating a metal film layer in a donut shape on a surface of a substrate formed of, for example, glass or plastic, and records data using both spiral grooves and lands. . A spindle motor 102 rotates the optical disk in a concentric direction. An optical pickup module 103 reads / writes data from / on the optical disk 101. An access control unit 104 controls the operation of the optical pickup module 103 by focus control, tracking control, and spindle control. A demodulation unit 105 binarizes a signal from the optical pickup module 103 and demodulates the signal into valid data. Reference numeral 106 denotes a buffer memory, which is formed of, for example, a semiconductor memory or the like, and stores data converted by the demodulation unit 105. An error correction unit 107 performs an error correction process on the data in the buffer memory 106. Reference numeral 108 denotes an ECC encoding unit, which encodes an ECC unit of data transmitted from the host 120. A modulation unit 109 modulates data encoded by the ECC encoding unit 108. Reference numeral 110 denotes a recording / reproducing / erasing waveform generating unit which generates a signal for recording / reproducing / erasing on the optical disc 101 from the data modulated by the modulating unit 109. Reference numeral 111 denotes a host IF unit that receives a request from the host 120, transmits the request to the control unit, transfers data read from the optical disk 101 from the buffer memory 106 to the host 120 according to an instruction from the control unit, and performs data transfer from the host. To the buffer memory 106. A control unit 112 controls the optical disk device, that is, the entire block described above. Reference numeral 113 denotes a control memory, and the control unit 112 issues a data read / write request to the drive device 100 for the optical disk 101 to the drive device 120.
[0022]
When the host issues a data read request to the optical disk device, the content is first received by the host IF unit and transmitted to the control unit. The control unit controls the spindle motor and the optical pickup module by using the access control unit, and reads data requested by the host from the optical disc. The signal read by the demodulation unit is demodulated and stored in the buffer memory. The error correction unit performs an error correction process on the data, and the host IF unit transfers the requested data to the host.
[0023]
Next, an example of an initial defective sector and a guard area which is an area where data cannot be read / written will be described with reference to FIGS. As shown in FIG. 2, the physical address PBA and the logical address generally do not match. First, the physical address of an object determined to be unreadable and writable at the time of initial format called PDL is entered in PDL. Then, a logical address is assigned to a sector which can be read and written next. Furthermore, a zoned optical disc, such as a DVD-RAM, has an area called a guard area to which a logical address cannot be assigned. Taking FIG. 2 as an example, the logical addresses cannot be assigned as areas where the PBAs 2, 4, 5, 100 to 149, and 152 to 248 cannot read or write data.
[0024]
Since the PBA of the guard area can be known in advance by the media type, the head physical address of each zone can be set in advance, and the head logical address of each zone, that is, the LBA of zone 0 is 0, In the case of zone 1, information indicating that the LBA is 91 is also recorded on an optical disk in the same manner as PDL, an area called DDS (Disc Definition Structure).
[0025]
Next, in such a configuration, the flow of the initial defect processing related to the conversion from the logical address to the physical address in the present embodiment will be described in detail with reference to FIGS. A read / write request is specified by a logical address from the host. This is referred to as a request LBA.
[0026]
Step 401 is a step of determining whether or not the target logical address is the first LBA of data requested by the host to read / write. In step 402, when the target LBA matches the head LBA of the data requested by the host in step 401, the expected value PBA of the target LBA is obtained according to the flow of FIG. , A step of substituting the entry number of the PDL entry having the expected value PBA or more into the “PDL entry pointer”. Step 403 is a step of incrementing the expected value PBA obtained by the previous initial defect processing. Step 404 is a step of substituting a PDL entry pointer and an expected value PBA for variables X and Y, and substituting 0 for a variable called counter. Step 405 is a step for checking whether or not X, that is, the PBA of the defective sector indicated by the PDL entry NO matches Y, that is, the expected value PBA expected when the PBA is not a defective sector. Step 406 is a step of incrementing various variables called X, Y, and counter, respectively. Step 407 is a step for checking whether the counter is larger than a predetermined number that can be determined in advance. In step 408, after executing steps 406, 407, and 408 a predetermined number of times, if the defect sector PBA still indicated by X continues to match, the remaining number of defective sectors continues according to the flow of FIG. This is a step of investigating whether or not the PDL entry number is equal to the number of consecutive defective sectors, adding the same to the expected value PBA, and substituting the PDL entry NO immediately after the discontinuity of the defective sectors into Y. In step 409, when the defective sector PBA indicated by X does not match Y in step 405, and after X and Y are updated in step 408, the expected value PBA and the PDL entry This is the step of substituting into a pointer. Step 410 is a step of setting the target LBA, the PBA in consideration of the initial defective sector, and the expected value PBA. Step 402 will be described in detail with reference to the flowchart of FIG. Step 501 is a step of examining in which zone on the optical disk the requested LBA from the target host exists. Step 502 is a step in which the head LBA and PBA of the zone obtained in step 501 are obtained and assigned to the variables TOPLBA and TOPPBA. Step 503 is a step of subtracting TOPLBA from the request LBA, which is the target LBA, and assigning the difference to the variable OFFSET. Step 504 is a step of adding OFFSET to TOPPBA and assigning it to a variable BTMPBA. Step 505 is a step of counting the number of defective sectors between BTMPBA and TOPPBA with reference to the PDL obtained in advance from the optical disc, and substituting the number into the variable COUNT. Step 506 is a step for checking whether the variable COUNT calculated in step 505 is 0 or not. Step 507 is a step of substituting BTMLBA for TOPLBA and adding COUNT to BTMPBA. Step 508 is a step of substituting BTMPBA for the expected value PBA when COUNT becomes 0 in step 507. Step 509 is a step of substituting the PDL entry NO that is the PDL entry address closest to the expected value PBA and equal to or higher than the expected value PBA from the expected value PBA calculated in step 508 to the PDL entry pointer. Step 510 is a step of returning the expected value PBA and the PDL entry pointer obtained in steps 508 and 509.
[0027]
Step 408 will be described in detail with reference to the flowchart of FIG. Step 601 is a step of substituting X for the variable TOP, obtaining the last entry number of the PDL entry from the DDS obtained in advance from the optical disk, and substituting it for the variable BTM. Step 602 is a step of substituting the integer part of the value obtained by dividing the sum of TOP and BTM by 2 into the variable MID. Step 603 is a step for checking whether the TOP and the MID match. Step 604 is a step of checking whether the difference between the defective PBA indicated by the MID and the defective PBA indicated by the TOP matches the difference between the MID and the TOP. Step 605 is a step of substituting the MID for TOP. Step 606 is a step of substituting the MID for the BTM. Step 607 is a step of substituting the defect PBA + 1 indicated by the TOP for Y and the BTM for X when the TOP and the MID do not match in step 604.
[0028]
As described above, according to the present invention, the expected value obtained when the logical address specified by the host is converted to the physical address is compared with the defective physical address that is likely to be in the PDL. Returns the expected value of the physical address and terminates.If there is a match, the value obtained by incrementing the expected value of the physical address is compared with the defect address entered next to the address of the matched defect information. If not, the physical address is returned and the processing is terminated. If the addresses match, a process of comparing the value obtained by further incrementing the expected value of the physical address with the defect address entered next to the address of the defect information is performed in a predetermined manner. It repeats up to the number of times, and then the defect entry is interrupted by two-branch search from the registered defect information, that is, specified from the host. By skipping the defective sector of the specified logical address and returning a physical address in consideration of the defect information from the specified logical address, access to the defective sector table can be minimized even when defective sectors exist continuously. LBA can be converted to PBA at high speed (see FIG. 10).
[0029]
(Embodiment 2)
In the same block configuration as in the first embodiment, PDL, which is initial defect information, is obtained from the optical disk of the control unit by defect information reading means, and the PDL is stored in the control memory. The case where the state of the optical disk is as shown in FIG. 2 will be described as an example. The PDL just stored in the control memory is shown in FIG. The number of continuations is checked based on the defect address in the PDL, and the information on the number of continuations is added to the control memory. FIG. 7 shows the added state.
[0030]
Next, when converting a target logical address into a physical address, it is checked whether or not the expected physical address is entered in the PDL in the control memory. The added physical address is the target logical address converted to the physical address after the defect processing.
[0031]
As described above, according to the present invention, when defect information is stored in the control memory, information on the number of consecutive defective addresses is obtained in advance, so that the expectation when the logical address specified by the host is converted into the physical address is obtained. The value is compared with the defective physical address of the PDL, and if the values do not match, the expected value of the physical address is returned and the processing is terminated. If the information on the number of consecutive defective sectors is added, this becomes a physical address in consideration of the defect information. Therefore, even when defective sectors are continuously present, access to the defective sector table is greatly reduced, and LBAs can be quickly deleted. Can be converted to PBA.
[0032]
(Embodiment 3)
In the same block configuration as in the first embodiment, PDL, which is initial defect information, is obtained from the optical disk of the control unit by defect information reading means, and the PDL is stored in the control memory. As in the second embodiment, an example in which the state of the optical disk is as shown in FIG. 2 will be described. The PDL just stored in the control memory is shown in FIG. The number of continuations is checked based on the defect address in the PDL, and the information on the number of continuations is added to the control memory. However, when the continuous number information exceeds a predetermined maximum continuous number information, the maximum continuous number information is added. FIG. 8 shows the added state.
[0033]
Next, when converting a target logical address into a physical address, it is checked whether or not the expected physical address is entered in the PDL in the control memory. The added physical address becomes the new expected physical address. It is again checked whether the expected physical address has been entered in the PDL in the control memory. If the entry has been entered, the information obtained by adding the continuous information of the entry to the expected physical address is further newly expected. It is a physical address. This process is repeated until the continuous number information becomes 0, and the expected physical address when it becomes 0 is obtained by converting the target logical address to the physical address after the defect processing.
[0034]
As described above, according to the present invention, when defect information is stored in the control memory, information on the number of consecutive defective addresses is obtained in advance, so that the expectation when the logical address specified by the host is converted into the physical address is obtained. The value is compared with the defective physical address of the PDL, and if the values do not match, the expected value of the physical address is returned and the processing is terminated. If the information on the number of consecutive defective sectors is added, this becomes a physical address in consideration of the defect information. Therefore, even when defective sectors are continuously present, access to the defective sector table is greatly reduced, and LBAs can be quickly deleted. Can be converted to PBA.
[0035]
The preparation of the continuous number information of the defective sector entry in the storage means is a process to be performed in advance in the optical disk device. When the continuous number information of the entry is the initial value, if the increment is performed one by one as in the related art and the check is performed, only the increment is performed one by one and the continuous number is checked as in the conventional method. When there is enough time, it is possible to prepare continuous number information of defective sector entries, which can contribute to shortening of the time until the start of access at the time of initial reading / writing / reading of the optical disk.
[0036]
【The invention's effect】
As described above, according to the present invention, a reading unit that reads defect information recorded in a predetermined area of an optical disc, a storage unit that stores the defect information read by the reading unit, and a storage unit that stores the defect information. An optical disc apparatus comprising: control means for performing control for converting a specified logical address into a physical address using defect information, wherein the initial defect processing is performed by using the defect physical address of the defect information and the logical address specified by the host. Is compared with the expected value when the address is converted to a physical address, and if they do not match, the expected value of the physical address is returned and the process is terminated, and if they match, the value obtained by incrementing the expected value of the physical address and the matching defect Compare with the defective address entered next to the address of the information, and if they do not match, return the physical address and end, If they match, the process of comparing the value obtained by further incrementing the expected value of the physical address with the defect address entered next to the address of the defect information is repeated up to a predetermined number. Where the defective entry is interrupted by a two-branch search from the information, that is, the defective sector of the logical address specified by the host is skipped, and the physical address in consideration of the defect information is returned from the specified logical address, so that the defective sectors are consecutive. Even when the LBA exists, the access to the defective sector table can be minimized, and the LBA can be converted to the PBA at high speed.
[0037]
In addition, adding the continuous information of the defective physical address of the defect information, and when the control means converts the logical address specified as the defective physical address of the defect information into a physical address without considering the defective sector. When it does not match the expected value, the physical address is returned and the process is terminated.When it matches, the physical address is added by the continuous number using the continuity information, and the defective sector is continuously present. In this case, access to the defective sector table can be reduced and LBA can be converted to PBA at high speed. The preparation of the continuous number information of the defective sector entries in the storage means is a process which should be performed in advance in the optical disk device. When the continuous number information of the entry is the initial value, if the increment is performed one by one as in the related art and the check is performed, as in the conventional case, only the increment is performed by one and the continuous number is checked. When there is enough time, it is possible to prepare the continuous number information of the defective sector entry, which can contribute to shortening of the time until the start of access at the time of initial reading / writing / reading of the optical disk.
[0038]
Further, the storage unit adds the maximum size as the continuous number information when the consecutive number information of the defective physical address of the defect information exceeds a predetermined size, and the control unit stores the defect physical address and the defective physical address of the defect information. If the specified logical address does not match the expected value when converted to a physical address, the expected value of the physical address is returned and the process is terminated. If it matches, the continuous number information is added using the continuous number information. The expected value of the physical address is compared with the defect information ahead of the continuous number information by a predetermined number of times, and the expected value of the physical address when the address no longer matches is returned. In this case, access to the defective sector table can be reduced and LBA can be converted to PBA at high speed.
[0039]
In addition, since this method limits the number-of-consecutive-times information on defective sectors, the area for storing the number-of-consecutive-times information can be small, and can be realized, for example, even in an empty area in the defective sector table.
[0040]
Also, the preparation of the continuous number information of the defective sector entry can be set when the optical disk device is convenient, and it can contribute to shortening the time until the start of access at the time of initial reading / writing / reading of the optical disk.
[0041]
As described above, the most optimal processing can be provided in the defect processing for the initial defect, in which the defective sectors are often not continuous, and when they are continuous, the number of continuous sectors is often large.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an optical disc device according to an embodiment of the present invention.
FIG. 2 is a comparison diagram of PBA and LBA of a zoned optical disc.
FIG. 3 is a view showing a PDL in the optical disc of FIG. 2;
FIG. 4 is a flowchart of a defect processing program in the optical disk device of FIG. 1;
FIG. 5 is a flowchart of a program for calculating a PDL entry pointer and an expected value PBA in the flowchart of FIG. 4;
FIG. 6 is a flowchart of a two-branch search processing program in the flowchart of FIG. 4;
FIG. 7 is a diagram showing continuation number information when the PDL entry is as shown in FIG. 3 according to the second embodiment of the present invention;
FIG. 8 is a diagram showing continuation number information when the PDL entry is as shown in FIG. 3 according to the third embodiment of the present invention;
FIG. 9 is a diagram showing a conventional defect processing.
FIG. 10 is a diagram showing defect processing according to the embodiment of the present invention.
[Explanation of symbols]
100 Optical disk drive
101 Optical Disk
102 Spindle motor
103 Optical Pick Module
104 Access control unit
105 Demodulation unit
106 buffer memory
107 Error correction unit
108 ECC encoding unit
109 Modulation section
110 Record / reproduce / erase waveform generator
111 Host IF
112 control unit
113 Control memory

Claims (3)

Reading means for reading defect information recorded in a predetermined area of the optical disc;
Storage means for storing the defect information read by the reading means,
Control means for performing control to convert a specified logical address into a physical address using the defect information stored by the storage means,
The control means compares the defective physical address of the defect information with an expected value when a logical address specified by a host is converted into a physical address, and returns an expected value of the physical address when they do not match, and ends. If there is a match, the value obtained by incrementing the expected value of the physical address is compared with the defect address entered next to the address of the matching defect information, and if there is no match, the physical address is returned and the processing is terminated. When they match, the process of comparing the value obtained by further incrementing the expected value of the physical address with the defect address entered next to the address of the defect information is repeated up to a predetermined number. Where a defective entry is interrupted by a two-branch search from the information, that is, a defective sector of a logical address specified by the host is skipped. , An optical disk apparatus, characterized in that return a physical address upcoming considering the defect information from the specified logical address. Reading means for reading defect information recorded in a predetermined area of the optical disc;
Storage means for storing the defect information read by the reading means,
Control means for performing control to convert a specified logical address into a physical address using the defect information stored by the storage means,
The storage means adds the continuous information of the defective physical address of the defect information, and the control means converts the defective physical address and the designated logical address of the defect information into a physical address without considering a defective sector. An optical disk device characterized by returning the physical address when the value does not match the expected value when the data is converted to a format, and returning the physical address obtained by adding the number of continuous numbers using the continuous information when the value matches. Reading means for reading defect information recorded in a predetermined area of the optical disc;
Storage means for storing the defect information read by the reading means,
Control means for performing control to convert a specified logical address into a physical address using the defect information stored by the storage means,
When the consecutive number information of the defective physical address of the defect information exceeds a predetermined size, the storage unit adds the maximum size as the consecutive number information, and the control unit is designated as the defective physical address of the defect information. If the logical address does not match the expected value when the address is converted to a physical address, the expected value of the physical address is returned and the process is terminated. An optical disc apparatus characterized by repeating comparison of an expected value of an address with defect information ahead of the continuous number information up to a predetermined number, and returning an expected value of a physical address when the addresses no longer match.

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