JPS62154372A - Substitute recording and reproducing method - Google Patents

Abstract

PURPOSE:To perform an addressing process with logical sector addresses which eliminates the need for address conversion due to a defect sector by performing the substitute recording of data information of the defect sector to a substitute address, recording address information on the substitute address in the defect sector in a recording specified address, and re-producing the substitute recorded data information based on the address information on the defect sector. CONSTITUTION:A recording and reproducing medium (optical disk) consists of a recording specified address area (user area) where physical sector addresses 11, track addresses 12, and recording specified addresses are assigned and a substitute address area 14 where substitute addresses are assigned. Address information on a substitute sensor where data information to be recorded in the defect sector is recorded in the defect sector generated in the user area 13, so the defect sector is reproduced to recognize which sector of the substitute address area 14 the data information which should be recorded in the defect sector is recorded in.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an alternate recording and reproducing method in a recording and reproducing medium.

Taking a write-once type optical disk device as an example of a conventional technical recording/reproducing medium, I will explain below that although this lightning disk can store a large amount of information, it also has many defective areas (hereinafter referred to as bad sectors). As is well known, since this occurs, recording area replacement processing is necessary.

As shown in FIG. 4, one conventional example of the replacement process is a method of skipping each defective sector 1 and sequentially recording data information only in normal sectors 2 other than the defective sectors 1. In addition, in Fig. 4, 3 is the physical address of the sector (hereinafter referred to as physical sector address).
, 4 is a so-called logical sector address (hereinafter referred to as logical sector address) indicating an address for actual data information.

As another example of replacement processing, as shown in FIG.
In this example, multiple trunks consisting of 15 sectors)
Define @(track address 5) and set each track Q~[
F], a certain number of sectors (in this example, 3 sectors ◎ to 0) are reserved for each track in advance for bad sectors, and 1 bad sector (indicated by an x mark) is reserved for each track Q to [F]. There is a method of sequentially recording data information only in normal sector 2.

Problems to be Solved by the Invention However, according to the example shown in FIG. 4, although the processing as a drive device is simple, even if the amount of information is the same, recording blocks may be area fluctuates. For example, in this example, the area for 12 sectors is 15
The area is changing to the size of a sector. Therefore, a data processing block (hereinafter referred to as a host) using an optical disk device can only handle physical sector address 3, and its use as a data processing memory is largely limited.

Furthermore, according to the example shown in FIG. 5, since a certain number of bad sectors 1 (in this example, 3 sectors) can be absorbed per track, the host can absorb a certain number of normal sectors (12 in this example).
Assuming that the number of sectors) is always prepared, it can be processed as a so-called logical sector address 4, and random recording and reproduction between tracks becomes possible. but,
It is impossible to determine whether a bad sector is a bad sector because it depends on factors such as scratches, dust, or deterioration of the disk material over time. Random recording and playback within the trunk cannot be performed because sector address discrimination information must be used. Therefore, sequential recording is forced within the track, and even this method has certain restrictions on its use as a data processing memory.

SUMMARY OF THE INVENTION An object of the present invention is to provide an alternating recording and reproducing method that enables a host to treat an optical disk not as a physical sector but also as a logical sector address, and to perform completely random recording and reproducing of tracks and sectors. shall be.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides that, during recording, data information to be recorded at a designated recording address of a bad sector is alternately recorded at an alternate address, and the alternate address is alternately recorded. The alternately recorded data information is reproduced by recording the address information of the address in the defective sector of the designated recording address and reproducing the address information of the alternate address at the time of reproduction.

Effects With the above configuration, the host can perform addressing processing using logical sector addresses without having to consider address translation due to bad sectors, and there is no need for not only random recording and playback between trunks but also sequential recording within tracks. Random access recording between sectors becomes possible.

Embodiment FIG. 1 shows an example of an area map on a recording/reproducing medium (optical disk) to which the method of the present invention is applied. In the figure, 11 is a physical sector address, and in this example,
Sectors are allocated. 12 is a trunk address, and in this example, 1 to 20,000 tracks are set. Reference numeral 13 denotes a recording designated address area (hereinafter referred to as user area) to which a recording designated address is allocated, and in this example, sectors ◎ to ◎ of physical sector address 11 are allocated. Reference numeral 14 denotes an alternate address area to which alternate addresses are allocated, and in this example, sectors 0 to 0 of physical sector address 11 are allocated.

FIG. 2 is a diagram for explaining one embodiment of the basic processing of the alternate address area using the optical disc of FIG.
Components that are the same as those in the figures are designated by the same reference numerals. however,
Each track of the track address 12 is shown with symbols ■ to ■. Each of these tracks ■ to [F] consists of a sector of the designated recording address area 13 allocated corresponding to the sector ■ to ■ of the physical sector address 11, and an alternate address area 14 allocated corresponding to the o-■ sector. sector (
Hereinafter, this is referred to as a replacement sector. ) has a logical sector address 15 consisting of Each of these logical sector addresses 1
The X mark within 5 represents a bad sector.

16 indicates the signal of the track ■ on the optical disk;
7 is a data recording signal of data information recorded in the normal sector, and 18 is a signal of address information of the alternate sector (corresponding to sector 0) recorded in the defective sector. 19 is a data recording signal of data information (3) recorded in the alternate sector corresponding to the 0 sector. In other words,
In this case, the data information (3) is not recorded in the bad sector × of the user area 13 corresponding to the sector ■, and the information (3) is replaced in the replacement sector of the replacement address area 14 corresponding to the 0 sector. Record. And this data information (
The address information (hereinafter referred to as address) of the alternate sector (corresponding to 0 sector) in which 3) was alternately recorded is recorded in the defective sector X corresponding to the ■ sector.

Therefore, the bad sector of the user area 13 corresponding to the sector ■ appears to be in the same state as data information (3) is recorded, and the user area 13 has the physical sector address 11 It is possible to randomly record data information (1) to (11) in correspondence with the ~O sectors. The same can be done for the other tracks (1) to (2).

On the other hand, during playback, for example, if a bad sector × corresponding to sector ■ of track ■ is read, a replacement sector (0
By reading the replacement sector (corresponding to sector 0) specified by that address, the data information (3) that should originally be recorded in the bad sector × corresponding to sector ■ is reproduced. be done.

In other words, as shown in FIG. 1, an optical disc is roughly divided into a user area 13 and an alternate address area 14 for address management purposes, and a bad sector that occurs in the user area 13 contains data information that should originally be recorded in that bad sector. Since the address information of the recorded alternate sector is recorded, by reproducing the defective sector, it is possible to determine in which sector of the alternate address area 14 the data information to be recorded in the defective sector is alternately recorded. can be recognized.

Note that, as shown by the logical sector address 15 of the track ◎ in FIG. The data information to be alternately recorded (data information (11) in this example) is recorded in another normal alternate sector (corresponding to the O sector in this example), and the address of the alternate sector is written as the above in the alternate address area 14. Record in bad sector ×.

Since the present invention adopts such a system, the user area 13
Even if a bad sector occurs in the internal memory, the area of the recording block that records the specified data information (in this example, data information from (1) to (1'4)) is always constant (the area corresponding to ■ to O sectors). Therefore, it does not fluctuate like before.
The host can not only perform random recording and playback between tracks ■ to [F], but also random record and playback between sectors within each track ■ to [F] (processed as logical sector addresses), and it is now possible to perform random recording and playback between sectors within each track ■ to [F] (processed as logical sector addresses). There are no restrictions on usage as memory.

Note that the ratio between the user area 13 and the alternate address area 14 is determined by the bad sector rate of the optical disk, but since the amount of information on the optical disk is large, if there are more bad sectors than the number of alternate sectors secured in advance. is possible. In consideration of such a case, it is desirable to prepare the number of replacement sectors in each row from the beginning.

FIG. 3 shows an example of the format of addresses of replacement sectors recorded in defective sectors in the user area 13. In the figure, M-1 and M+1 of logical sector addresses 15 are shown.
are normal sectors, and M is a bad sector.

20 is the address format of the replacement sector corresponding to the 0 sector in FIG. 2, 21 is the address format of the replacement sector corresponding to the O sector in FIG. 2, and 22 is the address format of the replacement sector corresponding to the O sector in FIG. 2. The format of the address is 17, a data recording signal, 23, a mark indicating the alternate sector address signal 18 (see FIG. 2), and 24, no mark.

Since the address data length of the replacement sector recorded in the defective sector is set to be sufficiently longer than that of the normal data, even if there is a loss that causes an error in the normal data, the effect on the replacement sector address is sufficiently small. In the format example shown in FIG. 3, the sector capacity is 1300 bytes (including redundancy, user capacity is 1024 bytes), and the ratio reaches approximately 3500.

In this way, by combining the mark 23 and the no mark 24, addressing of alternate sectors becomes possible.

For example, in FIG. 2, the defective sector × in the recording designated address area 13 corresponding to the sector ■ of the track
Format 20 of the figure is applied.

With this format 20, it can be recognized that data information to be recorded in the defective sector is alternately recorded in the alternate sector corresponding to sector 0 in FIG. 2.

Further, format 21 is applied to the bad sector × corresponding to the ◎ sector of the track ◎. However, since the replacement sector corresponding to the ■ sector specified by format 21 is a defective sector, format 22 is applied to this defective replacement sector. With this format 22, it can be recognized that the data information (11) to be recorded in the defective sector corresponding to the 0 sector is recorded in the replacement sector corresponding to the ■ sector.

Effects of the Invention As is clear from the detailed description above, according to the present invention, the host can perform processing using logical sector addresses without having to consider address translation due to bad sectors, and can perform processing only by recording random access between tracks. First, it is possible to perform random recording and reproduction between sectors without the need for sequential recording within a track, so that it is possible to realize addressing without restrictions for the host.

[Brief explanation of drawings]

FIG. 1 is an area map showing an embodiment of an optical disc applied to the system of the present invention; FIG. 2 is a conceptual diagram illustrating an embodiment of basic processing of an alternate address area using the optical disc of FIG. 1; FIG. 3 is a format showing an example of the address of a replacement sector to be recorded in a defective sector in the designated recording address area of FIGS. 1 and 2, and FIG. 4 is a conceptual diagram for explaining an example of a conventional replacement recording/reproduction method. 5 are conceptual diagrams for explaining another example of the conventional alternating recording and reproducing system. 11... Physical sector address, 12... Trunk address, 13... Recording designated address area (user area), 1
4... Alternate address area, 15... Logical sector address, 16... Signal on optical disk, 17... Data recording signal, 18... Address signal of alternate sector recorded in defective sector. 19... Data recording signal recorded in the alternate sector, 20-22... Address format of the alternate sector, 23... Mark, 24... No mark. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (1)

[Scope of Claims] A designated recording address area and an alternate address area are provided on a recording/reproducing medium, and during recording, data information that should originally be recorded in a defective sector in the designated recording address area is transferred to a defective sector in the alternate address area. At the same time as recording in the replacement sector, the address information of the replacement sector is recorded in the bad sector, and during playback, the address information of the replacement sector recorded in the bad sector is reproduced, so that the address information is recorded in the replacement sector. An alternate recording and reproducing method characterized by reproducing the data information.