JPH0642300B2 - Alternate recording and playback method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing system of a type in which a recording medium such as an optical disk can be freely attached / detached to / from a recording / reproducing apparatus at a user level, and in particular, a defective medium The present invention relates to a replacement recording / reproducing method of recording and reproducing information while avoiding a portion.

2. Description of the Related Art As an example of a conventional write-once type, a write-once type (write-once type) optical disc in which information can be recorded only once at a user level will be described. The information recording area of this optical disc is divided into tracks for each circumference, and each track is divided into a large number of sectors. When information is to be recorded, only the recordable sector having no defect is used for recording, and if a defective sector is detected, the sector is skipped and the next recordable sector is recorded.

As a method of managing a defective sector or the like of a recording medium, when the recording medium is inserted into a recording / reproducing apparatus, the state of the recording medium is checked under the control of an external device (for example, a host computer) to manage the defective sector or the like. The information is stored in the memory in the external device. Then, based on the management information stored in the memory, address management is directly performed when the external device accesses the recording medium. That is, the external device manages the physical address of the recording medium.

Problems to be Solved by the Invention As described above, the method of managing the alternate recording of the recording medium by the external device does not cause much problem when the recording medium fixedly corresponds to the device such as a hard disk device. . However, in a system in which there are a large number of recording media such as optical discs and the user attaches and detaches and exchanges arbitrary recording media to and from the recording / reproducing apparatus, the following problems occur.

Each time the recording medium is inserted into the recording / reproducing apparatus, the information of the good / bad sectors is checked, so that the exchange of information becomes complicated and the access time becomes long. Further, in order to store the management information on a large number of recording media, it is necessary to prepare a considerably large memory area in the external device.

The present invention has been made in view of the above-described conventional problems, and an object thereof is to allow an external device to simply access by a logical address without being aware of the alternate recording state of each recording medium. It is to provide a replacement recording / reproducing method.

SUMMARY OF THE INVENTION Therefore, according to the present invention, a plurality of recording areas each including a data area including a plurality of sectors and a spare area including a spare sector for coping with a defect in the sector as one management unit, and each of the recording areas are recorded. An alternate recording area composed of an alternate sector for dealing with data that cannot be replaced by the spare sector in an area different from the area, a logical address on the recording area of the data recorded in the alternate recording area, and a physical address on the alternate recording area. The recording medium is provided with a replacement management area for recording a pair of and, and prior to the reproduction of the recording medium, the information of the replacement management area is read and the logical address designated by the external device is exchanged with the physical address in the reproducing device. To do.

Action Since the replacement management information is recorded on the recording medium itself, it is not necessary to store the replacement management information of the medium in the recording / reproducing apparatus or the external device. When the user sets an arbitrary recording medium in the reproducing device, the reproducing device reads the replacement management information of the recording medium. When the external device accesses the reproducing device by the logical address, the reproducing device exchanges the logical address with the physical address based on the alternation management information, and reproduces the specified information from the recording medium.

Example As an example, a write-once optical disc will be taken. FIG. 1 shows a recording format of an optical disc when the present invention is applied.

The information recording area of the optical disc is divided into a user area, an alternate track area, and an alternate track management area. Information on the user side is recorded in the user area and the replacement track area, and the replacement management information described above is recorded in the replacement track area.

In the example of FIG. 1, one disk has 10,000 tracks, 8,000 tracks of track numbers 0 to 7999 are user areas, 1,000 tracks of track numbers 8000 to 8999 are alternate track areas, track number 9000. Thousands of tracks up to 9999 are assigned as alternate track management areas.

In addition, one track is divided into 20 sectors at equal intervals, and the last four sectors (sector number 1
6, 17, 18, 19) is the spare sector for that track.
Information for 16 sectors shall be recorded on each track.

Here, it is assumed that, when an attempt is made to record certain information in the track number 5000 part of the user area, a defective sector occurs and only 14 sectors can be recorded in one track even if the spare sector is used. In this case, the remaining two sectors of information that could not be recorded on the 5000th track are recorded in order from the beginning of the alternate track area. In the example of FIG. 1, the information for the above two sectors is recorded in the first sector and the second sector of the track number 8000 in the alternate track area. This is the replacement record. If a defective sector is detected during the alternate recording, the sector is skipped for recording.

After the above alternation recording is performed, the alternation management information is recorded in the alternation track management area in order from the beginning. The alternation management information is information indicating how many sectors of the information to be recorded in which track of the user area have been alternately recorded in which sector of which track of the alternation track area. In the previous example, the information for 14 and 15 sectors of the 5000th track is 80
The management information indicates that the data is recorded in the 1st sector and the 2nd sector of the 00th track, and this is recorded in the alternate track management area.

FIG. 2 shows an example of the recording format of the alternate track management area. One piece of replacement management information is recorded in one sector of the replacement track management area. 18 bytes from the beginning of one sector are divided into 6 equal parts, and the following 3 bytes of information are recorded in each. Each 3-byte information includes the track number of the user area that is the replacement source, the slit sector and end sector of the information number of the number of sectors to be replaced, the track number of the user area that is the replacement destination, and its replacement track. These are the start sector and end sector. In the previous example, is 5000, is 14, and is 1.
5, is 8000, is 1 and is 2.

Since the disc replacement management information is recorded on the optical disc itself as described above, it is not necessary to store this management information in another device (playback device or external device). When a certain optical disc is set in the reproducing device, the replacement management information of the optical disc is read into the reproducing device as an initial process. The external device may access the reproducing device with the logical address without being aware of the alternate recording at all. The playback device performs the conversion from the logical address to the physical address, reads the specified information from the optical disc, and passes it to the external device.

As described above in detail, in the alternate recording / reproducing method according to the present invention, a recording area having a data area and a spare area as one management unit and replacement of data that cannot be replaced by the spare area in one management unit. The recording medium is provided with three areas, a recording area and an alternation management area for recording the logical address and the physical address of the data recorded in the alternation recording area as a pair, and the reproducing apparatus alters the recording medium prior to reproduction. By reading the information in the management area and converting the logical address designated by the external device into a physical address, the occurrence of a defective sector that can be replaced by the spare area in one management unit can be dealt with in this management unit. In addition to realizing high-speed access, the alternate recording area is used to cope with the occurrence of a large number of defective sectors that cannot be replaced by spare areas, and alternate recording is also performed. Since the address information of the stored data is read prior to reproduction, a computer connected as an external device can realize high-speed access simply by designating a logical address without being aware of alternate recording.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of an overall recording format of a medium when the present invention is applied, and FIG. 2 is a conceptual diagram showing an example of a recording format of change management information.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoyasu Ohno 2-3-8 Shimomeguro, Meguro-ku, Tokyo Matsushita Dentsu Co., Ltd. (56) References JP-A-58-3104 (JP, A) JP-A-SHO 49-44725 (JP, A) JP-A-53-102719 (JP, A) JP-B-45-28617 (JP, B1)

Claims (1)

[Claims] 1. A plurality of recording areas in which a data area including a plurality of sectors and a spare area including a spare sector for dealing with a defect in the sector are used as one management unit, and the spare area is provided in an area different from each of the recording areas. Alternate recording area composed of alternate sectors for dealing with data that cannot be replaced by a sector, and alternation for recording the logical address on the recording area and the physical address on the alternate recording area of the data recorded in the alternate recording area as a pair. Alternate recording characterized in that a management area is provided on a recording medium, and information of the alternation management area is read prior to reproduction of this recording medium, and a logical address designated by an external device is converted into a physical address in the reproducing device. How to play.