JPH09198656A - Optical disk recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize respective regions as different recording media and to prevent erroneous erasure or the like by providing respective recording, regions for the control information of recording data in both regions of an optical disk in which a reproducing exclusive region and a recording enable region coexist. SOLUTION: The information recording region 5 of an optical disk 1 is composed of a reproducing exclusive region 2 for disk information 6 and a data region 7 and a recording-enable region 3 for disk information 8 and a data region 9. Disk information 6 and 8 including partition information indicating the construction of the regions 2 and 3, boot record, arrangement information, directory and the like are record in the head parts of the regions 2 and 3. A computer utilizing the optical disk 1 logically controls the optical disk 1 as two volumes, reads the recorded data of the region 7 or 9 referring to the information 6 or 8 or records. Thus, information is recorded in the region 3 and the erroneous erasure or rewriting of the information 6 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to an optical disk recording device connected to a computer and used for recording and reproducing data.

[0002]

2. Description of the Related Art Optical disks used in an optical disk device connected to a computer are roughly classified into a read-only disk and a rewritable disk. As an optical disk, a read-only disk for reading prerecorded information is a CD-ROM that uses a compact audio disk as a read-only memory for a computer. On the other hand, rewritable discs
There are a phase change disk that utilizes the state change of the recording film, and a magneto-optical disk that records information as magnetic pits due to the difference in the magnetization direction.

When the optical disk device is used as an information storage device in a computer, it is desirable that the program and data created by the user as well as the operating system software and application programs of the computer be stored in one disk. In the conventional usage form of an optical disc, operating system software and application programs are stored in a read-only disc for distribution or sale, and programs and data created by a user are stored in a rewritable disc. However, this requires the user to use two optical disks, which makes the operation complicated and lacks operability. Moreover, the storage capacity of an optical disk is very large. In the case of the above-mentioned CD-ROM, about 650MB,
Even a 3.5-inch magneto-optical disk has a storage capacity of 230 MB. Therefore, it is possible to store the program and data created by the user together with the above-mentioned computer operating system software and application programs in one optical disk.

Japanese Unexamined Patent Publication No. 62-173630 discloses an optical disc having a recorded information area for reproduction only and a recorded information area for recording. As a result, a program provided by the manufacturer or the like, such as a computer operating system software or an application program, is recorded in the recorded information area,
By recording a program or data developed by the user in the recording information area, it is not necessary to use two optical disks, and an information storage device for a computer having excellent operability can be obtained.

[0005]

According to the prior art, it becomes possible to provide a read-only area and a recordable area on one optical disk, and the operating-system software and application program of a computer are provided in the read-only area. By recording the program and data developed by the user in the recordable area, it becomes unnecessary to use two optical disks,
An information storage device of a computer having excellent operability can be obtained.

However, when a single optical disk in which such a reproduction-only area and a recordable area are mixed is handled by an information storage device of a computer, the conventional disk management method cannot be applied. An optical disk used as an information storage device of a computer is managed by a disk operating system (hereinafter referred to as DOS). DOS
Is information indicating what kind of information is recorded in which place on the disc (hereinafter referred to as disc information),
Store in a specific location on the disc. In the case of an optical disc device, when the optical disc is mounted in the optical disc device, the DOS reads out the disc information recorded in this specific location to determine what kind of information is stored in which place of the optical disc. know. When the disc is recordable, new information is recorded on the disc, or when already recorded information is updated or deleted, the disc information is updated accordingly.

When a reproduction-only area and a recordable area are mixed on one optical disk, there is a problem where to record the disk information. That is, when the disc information is recorded in the read-only area, it is impossible to update the disc information, so that it becomes impossible to newly record the information in the recordable area. On the other hand, when recording in the recordable area, since the information recorded in the read-only area cannot be updated, the disc information related to the information recorded in the read-only area must not be changed. Since the disc information of the reproduction-only area is in the recordable area, its contents may be changed.

As described above, the prior art has not disclosed a method for recording disc information when a computer uses a single optical disc having a read-only area and a recordable area.

An object of the present invention is to provide an optical disk recording apparatus that enables a computer to use one optical disk in which a read-only area and a recordable area are mixed.

[0010]

In order to achieve the above object, in a recording apparatus for an optical disk of the present invention, in an optical disk in which a read-only area and a recordable area coexist, a computer using the optical disk has respective areas. Is used as a separate volume, and the optical disk is configured so that the computer can use a read-only area and a recordable area as separate volumes.

When a computer uses an optical disc in which a read-only area and a recordable area are mixed, one optical disk is used as two or more volumes. That is, one optical disk is physically used as a plurality of optical disks. In order to enable the computer to use the read-only area and the recordable area as separate volumes for the optical disk, the read-only area and the recordable area are logically configured as one disk in the optical disk. That is, each area is provided with an area for recording disc information, which is information relating to the information recorded in each area. As a result, the disc information in the reproduction-only area is recorded in the reproduction-only area, and the disc information in the recordable area is recorded in the recordable area.
Therefore, the reproduction-only area and the recordable area are mixed 1
For a single optical disc, the disc information is not recorded in the recordable area because the disc information is recorded in the read-only area, or the disc information in the read-only area is recorded because the disc information is recorded in the recordable area. It cannot be erased or rewritten accidentally.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an optical disk recording apparatus of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram of an optical disc using the optical disc recording apparatus of the present invention. Reference numeral 5 is an information recording area of the optical disc 1, and 4 is a center hole. No data is recorded outside or inside the information recording area 5. The information recording area 5 is composed of a read-only area 2 and a recordable area 3. The reproduction-only area 2 is composed of disc information 6 and a data area 7. The detailed configuration of the disc information 6 will be described later. The recordable area 3 is composed of the disc information 8 and the data area 9. The structure of the disc information 8 will also be described later.

Here, the unit of recording and reproducing data on the optical disc will be described with reference to FIG. Tracks are concentrically formed on the optical disc 1. In this embodiment, the outermost track 37 is track # 0, the inner track 38 is track # 1, and the innermost track 39 is composed of K tracks. Each track is divided into a plurality of sectors on the circumference. In this embodiment, the head sector 40 of each track is sector # 1, the next sector 41 is sector # 2, and the last sector 42 is composed of M sectors. In this embodiment, the number of sectors is the same for the inner track and the outer track, but in an optical disc, the number of sectors on the outer track is larger than the number of sectors on the inner track, and the storage capacity is large. Some have done so.

FIG. 2 shows the structure of the disc information 6 in the reproduction-only area 2 of the optical disc 1 shown in FIG. In this embodiment, the disc information 6 of the reproduction-only area 2 includes the partition information 10, the boot record 11, the arrangement information 12,
It is composed of the directory 13. FIG. 3 shows the structure of the disc information 8 in the recordable area 3 of the optical disc 1. In this embodiment, the disc information 8 of the recordable area 3 is composed of a boot record 14, arrangement information 15, and a directory 16. Partition information 10
The information about the partition structure of the optical disc 1, in the present embodiment, the read-only area 2 and the recordable area 3 is recorded, and the details will be described later. The boot record 11 and the boot record 14 are areas for storing a program for activating system software of a computer that uses the optical disc 1. As the arrangement information 12 and the arrangement information 15, the arrangement information of the data recorded in the data area 7 of the reproduction-only area 2 and the data area 8 of the recordable area 3 is recorded. Directory 13,
The directory 16 records information about the data recorded in the data area 7 of the raw-only area 2 and the data area 8 of the recordable area 3, respectively. Generally, these pieces of information are managed by the operating system of the computer using the optical disc 1. Recording and reproduction of data to and from the computer, in other words, the optical disk 1 of the operating system, are performed in units of "file". File entries are recorded in the directory. A file entry consists of information about the file itself, such as the file name, file size, file attributes, and date and time the file was created, as well as information indicating where in the data area the file is recorded. . The layout information indicates the usage status of the data area. The unit in which the operating system records / reproduces data on / from the optical disc 1 is a file, but physical recording / reproduction on / from the optical disc 1 is performed in units of sectors in FIG. 7. The operating system also manages the data area of the optical disc 1 in units called clusters. One cluster is composed of one or more consecutive sectors. The layout information indicates the usage status of the data area in units of this cluster. The arrangement information indicates whether each cluster in the data area is recorded or unused. Further, the arrangement information indicates link information of clusters forming a file recorded in the data area. The link information is information indicating a cluster in which the next data is recorded when the file is recorded over a plurality of clusters.

FIG. 8 shows the configuration of a computer system using an optical disc. An optical disk device 36 for recording / reproducing the optical disk 1 is connected to the bus 32 via a drive controller 35. The computer 30 is connected to the bus 32 via a host adapter 31. In addition to the optical disk device 36, a peripheral device of a computer can be connected to the bus 32. For example, a hard disk device 34 is connected via a drive controller 33. Generally such a computer 3
A bus 32 such as a SCSI interface is used for the bus 32 that connects 0 to peripheral devices. Computer 30
Is an optical disk device 3 connected to such a bus 32.
6, when recording / reproducing data to / from the hard disk device 34, the recording / reproducing unit is the sector as described above, but the recording location is designated by the block number.

FIG. 6 shows a block management method in this embodiment. FIG. 6 shows the correspondence between tracks #, 27, sectors #, 28 and blocks #, 29 on the optical disc 1. Sector # of track # 0
The sector of 1 is block # 0, the sector of sector # 2 of the following track # 0 is block # 1, and the subsequent tracks are track # 0.
The block # is numbered up to the sector #M which is the last sector of the. Following this, block sector # 1 of track # 1
It is set to M, and subsequent blocks # are numbered consecutively up to the last track.

FIG. 4 shows the partition information 1 in FIG.
FIG. 3 is a diagram showing a configuration of a zero. As described with reference to FIG. 2, the partition information 10 is the disc information 6 of the reproduction-only area 2.
It is recorded at the beginning of. In this embodiment, since the reproduction-only area 2 is arranged outside the optical disc 1, the reproduction-only area 2 starts from track # 0. Therefore, the partition information 10 is recorded in the sector # 1 of the track # 0, that is, the block # 0. The operating system of the computer that uses the optical disc 1 reads block # 0 of the optical disc, and if the partition information is recorded in the block # 0, reads the contents and reads the contents of the optical disc 1.
Examine the partition configuration of. The partition identifier 20 indicates that the partition information is recorded in the block. The bootstrap loader 17 is required when the optical disc 1 is used as a computer startup disc. When the computer boots the operating system, it reads the contents of block # 0 of the boot disk and transfers control to the bootstrap loader 17 recorded therein. The bootstrap loader 17 examines the contents of the partition information 10 to find a bootable partition. The boot record of the bootable partition stores a program for booting the operating system. In the case of the present embodiment, as shown in FIGS. 2 and 3, the boot record is recorded in the next block of the partition information 10 of the disc information 6 of the read-only area 2 and in the first block of the disc information of the recordable area 3. To be done. If there is a bootable partition, the bootstrap loader reads the boot record of that partition and transfers control to that program. In the partition information 10, partition entries of all partitions existing on the optical disc 1 are recorded. In the optical disc 1 of this embodiment, as described with reference to FIG. 1, the optical disc 1 is divided into a partition constituted by the reproduction-only area 2 and a partition constituted by the recordable area 3.
It consists of individual partitions. In the partition information 10, the partition entries are described before the partition identifier 20 in order from the partition with the smallest block #, that is, in reverse order. In the optical disc 1 of this embodiment, the partition formed by the read-only area 2 is outside the disc and is on the smaller block # side. Therefore, the partition entry 19 of the read-only partition formed by the read-only area 2 has the partition identifier 20. The partition entry 18 of the recordable partition which is recorded on the front side and which is constituted by the recordable area 3 is recorded on the front side.

FIG. 5 is a diagram showing the structure of a partition entry. In this embodiment, the partition entry is composed of a boot indicator 21, a start block number 22, an end block number 23, a block number 24, a boot sector 25, and a partition attribute 26. The boot indicator 21 indicates whether or not this partition is a bootable partition. As described above, when the optical disc 1 is used as a boot disc, the operating system of the computer reads the bootstrap loader 17 of the partition information 10 of the optical disc 1 and transfers control to the program.
The bootstrap loader 17 uses the partition information 10
Whether or not there is a bootable partition on the optical disc 1 is checked by the partition entry recorded in 1., and if there is a bootable partition, the boot record of the partition is read and control is passed to the program. The information for the bootstrap loader to determine whether each partition is bootable is the boot indicator. The start block number 22 indicates the start block # of the partition, the end block number 23 indicates the end block number of the partition, and the block number 24 indicates the number of blocks constituting the partition. As described above, the computer that uses the optical disc 1 manages the optical disc 1 in units of blocks. As described above, the block numbers are sequentially assigned from 0, with one sector of the optical disc 1 as one block. Sector # 1 of track # 0 is block # 0. The position and size of the partitions forming the optical disc 1 are also described in the partition entry in units of this block. The boot sector 25 indicates the block number of the block in which the boot record of each partition is recorded. In this embodiment, the block number of the block in which the boot record 11 of the disk information 6 of the read-only area 2 is recorded in the boot sector 25 of the partition entry 19 of the read-only partition is the boot sector of the partition entry 18 of the recordable partition. In 25, the block number of the block in which the boot record 14 of the disc information of the recordable area 3 is recorded is described. The partition attribute 26 indicates the attribute of the partition, and in this embodiment, the information for identifying the operating system that uses the partition is described. Since the arrangement information and the directory structure recorded in the disk information described above depend on the operating system, this is information for determining under which operating system the partition can be used.

In this embodiment, the computer using the optical disc 1 treats the optical disc 1 as two logically separate volumes. That is, a read-only partition formed by the read-only area 2 and a recordable partition formed by the recordable area 3. The operating system manages each partition as a separate volume. When reading the data recorded in the data area 7 of the read-only area 2, the disc information 6 of the read-only area is referred to, and when reading the data recorded in the data area 9 of the recordable area 3 or When recording data in 9, the disk information 8 is referred to.

The optical disk of FIG. 10 is the optical disk 1 of FIG.
A plurality of partitions are provided in the read-only area 2 and the recordable area 3, respectively. Reproduction-only partitions 1, 43 and reproduction-only partitions 2, 44 are provided in the reproduction-only area 2, and recordable partitions 1, 45 and recordable partitions 2, in the recordable area 3.
46 is provided. Each partition is composed of disk information and data area. The reproduction-only partitions 1 and 43 are the disc information 47 and the data area 48, the reproduction-only partitions 2 and 44 are the disc information 49 and the data area 50, and the recordable partitions 1 and 45 are the disc information 51, the data area 52, and the recordable partition 2, 46 is composed of disk information 53 and a data area 54. In the case of the configuration of the optical disc 1 of this embodiment, the disc information 47 of the reproduction-only partitions 1 and 43 is the configuration of FIG.
44 disk information 49, recordable partition 1,
45 disk information 51, recordable partition 2,
The disc information 53 of 46 has the configuration shown in FIG. That is, the partition information 10 is included in the disk information 47 of the reproduction-only partitions 1 and 43 which are the outermost partitions of the optical disk 1.

FIG. 11 is a diagram showing the structure of the partition information 10 of the optical disc 1 shown in FIG. As described with respect to the partition information 10 of the optical disc 1 of FIG. 1, the partition information 10 includes the bootstrap loader 17, the partition information identifier 20, and the partition entries of all the partitions recorded on the optical disc 1. Therefore, the optical disc 1 shown in FIG. 10 has two partitions in each of the read-only area 2 and the recordable area 3, so that a total of four partition entries are recorded.
The partition entry 58 of the reproduction-only partitions 1 and 43 is in front of the partition information identifier 20, and the partition entry 57 of the reproduction-only partitions 2 and 44, the partition entry 56 of the recordable partitions 1 and 45, and the recordable partitions 2 and 46 are in front of this. Partition entry 55 is described.

As described above, according to the optical disk recording apparatus of this embodiment, the information of the data recorded in the data area 7 of the read-only area 2 in the optical disk 1 in which the read-only area 2 and the recordable area 3 are mixed. The disc information 6 for managing the data is provided in the read-only area 2, and the disc information 8 for managing the information of the data recorded in the data area 9 of the recordable area 3.
Is provided in the recordable area 3, and each area,
In other words, since the partition information is recorded in the read-only area, it is possible to prevent the information about the partition structure and the disc information of the data recorded in the read-only area from being accidentally erased or rewritten. The disc information of the data to be recorded in the recordable area can be recorded, and the computer can use the optical disc in which the read-only area and the recordable area are mixed.

Next, FIG. 9 shows a second embodiment of the recording method for the optical disk of the present invention. In the optical disc recording method described with reference to FIG. 1, a read-only area is arranged outside the optical disk 1 and a recordable area is arranged inside. As described with reference to FIGS. 6 and 7, in the optical disc of the present embodiment, blocks are sequentially assigned from the outer track. Since the partition information 10 of the optical disc 1 is recorded in the block of block # 0, the partition information 10 is recorded at the beginning of the read-only area in the optical disc 1 having the configuration of FIG. On the other hand, in the optical disc 1 of FIG.
A recordable area 3 is arranged on the outer side and a read-only area 2 is arranged on the inner side. As a result, in this embodiment, the partition information 10
Is recorded at the beginning of the recordable area 3. When the optical disk of this embodiment is used in a computer, the computer initializes the optical disk 1 before using it. That is, it is checked where the reproduction-only area 2 of the optical disk 1 is arranged, and based on the information, the partition information 1
The partition entry of the partition constituted by the reproduction-only area is recorded in 0. Since the partition information 10 is recorded in the recordable area 3 in the optical disc of the present embodiment, the partition information 10 may be erroneously erased or rewritten as compared with the configuration of the optical disc 1 described in FIG. On the other hand, there is an effect that the configuration of the partition of the recordable area can be changed at any time. As described above, the partition configuration is described by the partition entry recorded in the partition information 10. In the optical disc described with reference to FIG. 1, since the partition information 10 is arranged in the reproduction-only area 2, it is not possible to change the configuration of the partition constituted by the reproduction-only area 2 and the recordable area 3. In the configuration of the optical disc 1 described with reference to FIG. 9, since the partition information 10 is arranged in the recordable area 3, it is necessary to change the configuration of at least the partition formed in the recordable area 3, such as the size and number of partitions. Is possible.

[0025]

According to the present invention, in an optical disc in which a read-only area and a recordable area are mixed, each area is
Since the computer that uses the optical disk is configured to be used as a logically separate volume, the reproduction-only area and the recordable area each have disk information for managing recorded information. When using such an optical disc with
It is possible to record the information in the recordable area and prevent the disc information for managing the information recorded in the read-only area from being accidentally erased or rewritten.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an optical disc using an optical disc recording apparatus of the present invention.

FIG. 2 is an explanatory diagram of disc information 6 in a reproduction-only area 2 of the optical disc 1.

FIG. 3 is an explanatory diagram of disc information 8 in a recordable area 3 of the optical disc 1.

FIG. 4 is an explanatory diagram of partition information 10 of disk information 6.

5 is an explanatory diagram of a partition entry of partition information 10. FIG.

FIG. 6 is an explanatory diagram showing a block management method according to the present embodiment.

FIG. 7 is an explanatory diagram showing a unit of recording and reproducing data on an optical disc.

FIG. 8 is an explanatory diagram of a computer system that uses an optical disc.

FIG. 9 is an explanatory diagram of a second embodiment of an optical disc using the optical disc recording apparatus of the present invention.

FIG. 10 is an explanatory diagram of an optical disc in which each of a read-only area and a recordable area is composed of a plurality of partitions.

11 is an explanatory diagram of partition information 10 of the optical disc 1 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disc, 2 ... Reproduction-only area, 3 ... Recordable area, 6 ... Reproduction-only area disc information, 7 ... Reproduction-only area data area, 8 ... Recordable area disc information, 9 ... Recordable area data region.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Mori, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Multimedia system development headquarters, Hitachi, Ltd. (72) Hidefumi Goto Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa 292 Hitachi Co., Ltd. Multimedia system development headquarters

Claims (4)

[Claims] 1. An optical disc having a read-only area in which information is recorded in advance and a recordable area in which an information signal can be newly recorded or rewritten, and data recorded in the read-only area is managed. An area for recording information is provided, an area for recording information for managing data recorded in the recordable area is provided, and when the optical disc is used, the read-only area and the recordable area are logically divided. An optical disk recording apparatus, which is used as another recording medium. 2. The optical disk recording apparatus according to claim 1, wherein information indicating the configuration of each of the read-only area and the recordable area on the optical disk is recorded at the head of the read-only area. 3. The optical disk according to claim 2, wherein one or both of the read-only area and the recordable area is divided into a plurality of recording areas, and when the optical disc is used, each divided area is logically divided. An optical disk recording device used as another recording medium. 4. The optical disc according to claim 1, wherein information indicating a configuration of each of the read-only area and the recordable area on the optical disc is recorded at a head of the recordable area, and the optical disc is used. And a recording device for an optical disc that records information indicating the configuration of each area at the beginning of the recordable area.