JPH02213958A - Information recording/reproducing system - Google Patents

Abstract

PURPOSE:To increase the range of application of a single optical disk medium and at the same time to improve the availability of the optical disk media by controlling this disk medium by means of plural operating systems OS, logical drives, and volumes. CONSTITUTION:Each band table of a band table recording area includes an OS identification flag to show a specific OS that controls the recording of a relevant band. Therefore the data file limited to the OS under access can be controlled regardless of the data files recorded by other OSs by controlling the data files for only the bands recorded by the OSs equal to that under access. Thus it is possible to increase the range of application of the single optical disk medium and to improve the availability of the recording area of the optical disk medium.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information recording and reproducing system, and in particular to a media division method suitable for dividing a single disk medium into a plurality of logical volumes, etc. This invention relates to an information recording and reproducing method that enables.

[Traditional techniques, techniques]

Conventionally, Japanese Patent Application Laid-Open No. 134735/1984 is an example of dividing a single disk medium into a plurality of logical volumes.

JP-A-62-134735 is characterized in that a specified physical cylinder address is converted into a relative physical cylinder address based on a predetermined specific cylinder address.

[Problem to be solved by the invention]

The above conventional technology merely physically divides a single disk medium into two volumes;
Consideration has been given to partitioning into multiple volumes, logically partitioning a single disk medium into multiple drives, and partitioning a single disk medium into multiple operating systems (O8). However, there was a problem in that a single disk medium could not be used as multiple volumes, logically as multiple drives, and with multiple operating systems (hereinafter referred to as O8).

An object of the present invention is to provide an information recording and reproducing method that enables a method of dividing a single disk medium into a plurality of volumes, logically as a plurality of drives, and a plurality of O8s. Our goal is to provide the following.

[Means to solve the problem]

The above purpose is to provide a fixed length band table recording area at the beginning of the recording area of a single optical disk medium, and to provide a data recording area divided for each hand in the next area, and to In the table recording area, there is a band table that manages information about each hunt in the data recording area (O8 identification flag indicating which O8 management code the corresponding bunt was recorded in, band size, etc.) for each band. This can be achieved by recording.

[Effect]

Each band table in the band table recording area contains an O8 indicating which O8 the hand was recorded under.
Since there is an identification flag, it is the same as O8 currently being accessed.
By managing the data file only for pan 1 recorded on O8, you can manage the cheat file limited to the O8 currently being accessed without overwriting data files recorded on other O8. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a system block diagram of a write-once optical disc system to which the present invention is applied.

The write-once optical disk system 20 has an external control system 2.
5, the interface control unit 24 receives the instructions and controls the optical disk drive 22 via the read/write control unit 23.
This is a system that performs read/write operations on an optical disk medium 21.

FIG. 1 is an explanatory diagram schematically showing a recording state in a recording area of a write-once optical disk according to an embodiment of the present invention.

As shown in FIG. 1, in this embodiment, a band table recording area and a data recording area are arranged in this order from the beginning of the recordable area of the optical disc medium (inner circumference side in this embodiment). The data recording area includes a plurality of bands each consisting of a pair of directory recording area and data file recording area.

In the band table recording area, information regarding each band in the data recording area is recorded as a hand table. The band table recording area has a fixed length and is composed of a group of fixed length band tables. Each band table contains information (
For example, O indicates whether the hand was recorded in O8 with
8l! a flag, the size of the B-REF 1 to 1 recording area of that band, the size of the Cheetah file recording area of that bunt, and the O8-specific management information recorded on that bunt.

etc.) are recorded in a fixed length.

In this embodiment, the size of each band of data recording information is
It is determined by the size of the till left recording area set in the corresponding band tape of the hand table recording area and the size of the data file recording area.

In the TEF 1 edge recording area, directory information (file directory) of each data file recorded in the data recording area is AL'M with a fixed length.

Hereinafter, the sequence of the write-once optical disc system in this embodiment when actually operated will be explained using flowchart 1 shown in FIGS. 3 to 5.

FIG. 3 is a flowchart showing the sequence of the initialization routine when the power is turned on (at startup) or when the write-once optical disk medium is replaced.The steps in FIG. 3 will be explained below.

Step 31: At the beginning of the write-once optical disc media,
Since the band table for band 1 (band 1 table) is recorded, 1 (hand number=1) is set as the first band to be investigated.

Step 32: Read the band table of the set band number (initially, the band 1 table).

Step 33: Check whether band table data exists in the corresponding band table.

If the band table for the band does not exist,
Jump to step 37, the end phase.

If a hunt table exists, proceed to step 34.

Step 34: Examine the contents of the corresponding band table and compare the currently accessed O8 with the Os lfa-specific information recorded in the band table. If the same -O
If not S, the process jumps to step 236, and if -O8 is 4'l, then the process goes to step 35.

Step 35: Check the size of the direct recording area of the applicable band from the applicable band table, and read out all recorded areas of the directory recording art area of the applicable band. This file directory information is stored within the body memory of the external control system.

Step 36: In order to investigate the band table regarding the secondary band, the band number is incremented by 1, and the process moves to the band table investigation starting from step 32.

Step 37: End! do.

In this embodiment, if there is no hand recorded in the O8 currently being accessed (when the optical system is used for the first time).

This means that there is no file at all.

Further, if there are multiple bands recorded in the O8 currently being accessed, in step 35, information regarding the file directory to be read is accumulated.
The external control system can manage all cheater files recorded on the currently accessed O8.

By sequentially reading each band table in the band table area, the size of each hand in the data recording area (tilt left recording area size in the band table + data file recording area size) can be determined. By adding these sizes in order, it is possible to specify the position of pan 1- in the data recording area, which is the target.

FIG. 4 is a flowchart showing a sequence when a data file is written D (write) on an optical disk medium by the O8 currently being accessed.

Each step will be explained below.

Step 41: The O8 currently being accessed is included.

The last band number read in the initial routine of FIG. 3 is set as the band number to be set.

Step 42: Examine the file directory area and data file area in the corresponding band in the data recording area, and determine whether there is an unrecorded area in both areas.

If an unrecorded area exists in both areas, the process advances to step 43, and if not, the process advances to step 45.

Step 43: Record the data file in the unrecorded area of the tape aisle recording area in the corresponding hand.

Step 44: File Day 1 in the applicable band
The file directory of the data file recorded in step 43 is recorded in the unrecorded area of the directory recording area. Naturally, at this point, this data file is registered in the external control system. Next, the process advances to step 47 and ends the process.

Step 45 If in step 42 there is no unrecorded area in the file directory area or data file area, that band can no longer be used, so the band table recording area is investigated and a new hand full is set in the unrecorded area.

Step 46: Reset the new band set in step 45 as the band number, and proceed to step 43.

Step 47: Finish.

In this embodiment, band tables can be added until there is no unrecorded area in the band table recording area.

Figure 5 shows the case where the Cheetah file is read from the optical disk medium under the O8 currently being accessed.
It is a flowchart showing a sequence.

Each step will be explained below.

Step 51: Examine the file directory stored in the main body memory of the external control system.

Step 52: Determine whether a corresponding file directory exists. If there is a corresponding file directory, the process proceeds to step 53; otherwise, the process proceeds to step 54.

Step 53: Calculate the location of the corresponding cheat file from the file directory information, read the data file, and proceed to step 55.

Step 54 If in step 52 the corresponding file builf 1 does not exist, error processing for the absence of the corresponding file is executed, and the process moves to step 55.

Step 55: Terminate.

Note that the initial rice routine, file write routine, and file read routine shown in FIGS. file directory.

Any method that can manage data files may be used.

In the embodiments shown in FIGS. 1 and 3 to 5, the O8 identification flag is used to determine which O8 was recorded, and multiple O8s are recorded.
8 shows an example in which a single optical disk can be managed. When managing this single optical disk medium logically as multiple drives, by setting a band table for each specified drive number and providing a drive number identification flag in the band table,
This can be realized by the same processing operations as in this embodiment.

When a single optical disk medium is managed as several PI volumes, a band table is set for each specified volume number, and a volume number identification flag is provided in the band table. This can be achieved using similar processing operations.

FIG. 6 is an explanatory diagram schematically showing a recording state in a recording area of a write-once optical disc medium according to another embodiment of the present invention.

As shown in FIG. 6, in this embodiment, a band table recording area and a data recording area are arranged in this order from the beginning of the recordable area of the optical disc medium (inner circumferential side in this embodiment). In the data recording area, there are a plurality of bands each consisting of a pair of directory recording area and data file recording area.

In the band table recording area, information regarding each band in the data recording area is recorded as a band table. The band table recording area has a fixed length that is set in advance.
Consists of a group of tables.

Each hand table includes information regarding the band to which this hunt table points (for example, an O8 identification flag indicating whether the band was recorded in O8).

A punt start address indicating whether the hunt starts from the data recording area, a file directory recording area size indicating the size of the file directory area for that hand, etc.) are recorded in a fixed length.

In this embodiment, the size of each band in the data recording area is
The length is variable, and the data file recording area of that band increases until there is no unrecorded area in the file directory recording area of that band.

In the directory recording area, directing information (data file name, size, creation date and time, position of the cheater file in the data recording area, etc.) of each data file recorded in the data recording area is recorded in a fixed length. The same band may be divided into two or more bands in the data recording area. Although there is an unrecorded area in the file directory area of one band, the O8 identification flag in the pan 1 table is different and the O8 identification flag in the pan 1 table is different, and a new pan When 1- is registered, the bunt table of ) is Muted, and the tilt left area of the new band is generated in the first unrecorded area of the cheetah file recording area of the previous hunt. In this case, if you try to record the Cheetah file on the original band (for example, when it is reconfigured to the original O8), the data file directory will be registered in the unrecorded area of the original Hunt's file directory area, and
1) R8 the data file to the beginning unrecorded area of the data file recording area of the band registered as a new hand. As a result, this original band is divided into two and exists in the data recording area. I will do it.

Hereinafter, the sequence of the write-once optical disc system in this embodiment when actually operated will be explained using a flowchart.

For the initialization routine sequence and the file read routine sequence,
This is the same as in FIG. 5 and FIG. 5, and the explanation here will be omitted. Here, only the file write 1-routine will be explained.

FIG. 7 is a flowchart showing the sequence when a data file is recorded (written) on an optical disk medium by the O8 currently being accessed.

Each step will be explained below.

Step 701: The O8 currently being accessed is included. No. 318! ! The last band number read in the initial routine of 1 or the pan FNo last written by the currently accessing O8 is set as the target band number.

Step 702: Investigate whether there is an unrecorded area in the file directing area in the data recording area of the target band. If there is an unrecorded portion in the file directory area, the process advances to step 705; otherwise, the process advances to step 703.

Step 703: The fact that there is no unrecorded area in the file directory area of the target band means that no more recording can be done in the target band. Therefore, a new band table is registered in the unrecorded area of the band table recording area. At this time, an unrecorded area of the data file recording area in the data recording area is investigated, and the start address of the unrecorded area is set as the start address of the file directory area in the new band. The size of the file directory recording area is calculated and determined based on the expected number of files.

Step 704: Set the new band WMed in step 703 as the target band number.

Step 705: Investigate whether the last data file of the target band number is the next recorded area or an unrecorded area, and if it is an unrecorded area, step 70
If not, proceed to step 707.

Step 706: The beginning of the unrecorded area investigated in step 705 is set as the recording start address of the data file.

Step 707: The fact that the next area where the last data file of the target band is recorded is not an unrecorded area means that this area, which should originally be an unrecorded area, is used as the file directory area of another band. , that it has already been used, tastes. Therefore, the position (address) in the data recording area where the data file should be recorded.
need to know. Therefore, an unrecorded area of the data file recording area in the data recording area is searched.

Step 708 The start address of the unrecorded area of the data file recording area in the data recording area found in step 707 is set as the start address for recording the data file. Therefore, the data file recording area of the corresponding band continues from this start address.

Step 709 Step 706 or Step 70
The Cheetah file is recorded from the start address of the unrecorded area set in step 8.

Step 710 The information (directory) regarding the data file recorded in step 709 is recorded in the unrecorded area of the file directory area of the target hunt.

Step 712: End.

In the embodiment shown in FIG. 7, the address of the first unrecorded area of the data file recording area in the data recording area is checked each time, but in the initialization routine, the address of the first unrecorded area is searched, and from then on, the address of the first unrecorded area is checked. Using addresses reduces the burden on software processing.

In the embodiment shown in FIG. 6, the length of the data file recording area in the data recording area is variable for each band, and the data file is always recorded in the unrecorded area at the beginning of the data file recording area. multiple O
8, the recording area of the media can be used effectively.

The embodiments shown in FIGS. 6 and 7 show an example in which a single optical disc medium is managed by multiple O8s by determining which O8 the band was recorded in based on the O8 identification flutter in the band table. ing.

When managing a single optical disk medium logically as multiple drives, you can set a bunt table for each live number and set a drive number identification flag in the band table. This can be realized by the same processing operations as in the embodiment.Also, when managing a single optical disk device as multiple volumes 11, set a band table for each specified volume number, and Inside, volume N.

By providing an identification flag, it is possible to implement processing operations similar to those of this embodiment.

FIG. 8 is an explanatory diagram schematically showing a recording state in a recording area of a write-once optical disc medium in another embodiment of the present invention.

The embodiment shown in FIG. 8 assumes that a data file managed in the first hand is transferred to the second band. The following describes the procedure for copying the first band data file 1-1 as the second band data file 2-2 in the embodiment shown in FIG.

■ Recording position (data file start address) and size of data file 1-1 in the copy source band (
data file size) etc. from the file (1-1) directory.

■Create a file (2-2) directory in the copy destination band.

In this file (2-2) directory, the same data file start address, data file size, etc. as the copy source data file (L-]-) are recorded. The major difference between the data file (1-",) directory and the data file (2-2) directory is that the date and time the data file was recorded in the band (created at 1" time) and cheat file name are different. I don't like it.

By just the operations of ■ and ■ above, that is, without physically recording the data file (], -1-) of pan lj 1 in bunt 2, the contents of the file directory (data file start address, data file size By creating a new file in the band 2 file reference area, the data file can be copied.

In this embodiment, when copying the same file between bands, the data file can be copied without using any of the data file recording area on the write-once optical disc, improving the efficiency of recording area usage on the optical disc. can be achieved.

Furthermore, the embodiment shown in FIG. 8 assumes copying between drives that are logically managed in a single optical disk medium, and copying between multiple volumes in a single optical disk medium. However, file copying between O8s can be performed using the same processing procedure as in this embodiment using an inter-O8 file converter.

Of course, copying within the same band can also be achieved using a similar method.

Although this embodiment has been described assuming a write-once optical disk medium, it can also be applied to magnetic disk media and erasable optical disk media.

〔Effect of the invention〕

As explained above, according to the present invention, a single optical disk is connected to a plurality of oberete ink systems (O8
) can be managed independently.

A single optical disk medium can be logically managed as multiple trines. A single optical disk can be managed as multiple volumes. In this way, a single optical disk medium can be used to connect multiple O8s, logical drives, and volumes.

This management has the effect of expanding the scope of use of this single optical disk medium and at the same time improving the utilization efficiency of the recording area of the optical disk medium.

Note that the present invention has similar effects not only on write-once optical disk media but also on erasable optical disk media and magnetic disk media.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram for explaining one embodiment of the present invention, FIG. 2 is a block diagram showing an example of a write-once optical tisf system according to the present invention, and FIGS. Flowchart for explaining the embodiment shown in the figure, FIG. 6 is an explanatory diagram for explaining another embodiment of the present invention, and FIG. 7 is a flowchart 1-1 for explaining the embodiment of FIG. 8th
The figure is an explanatory diagram for explaining another embodiment of the present invention. I--= write-once optical disk system, 21... optical disk memory, 22... optical disk drive. 23...Read/write control unit, 24...Interface control unit, 25...External control system. Fig. 1 Compilation diagram Compilation diagram Collection diagram Collection diagram

Claims (1)

[Claims] 1. In addition to providing a plurality of band areas consisting of a file directory recording area and a data file recording area on the information recording medium, management information of the contents recorded in each band is recorded corresponding to each band area. A band table is provided, and management information recorded in the band table is used to make the information recording medium logically available as a plurality of volumes, as a drive, or as a plurality of operating systems. An information recording and reproducing method characterized by: 2. When an information recording medium has multiple band areas consisting of a file directory recording area and a data file recording area, and a data file is copied to the same band or another band, the corresponding data file can be copied without re-recording the data file. An information recording and reproducing method characterized in that a data file copying operation is performed by copying only a necessary part of a file directory of a data file.