JPH0246584A - Method for filing optical disk - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc file method for storing data on an optical disc.

[Conventional technology]

FIG. 8 is a functional block diagram of an optical disc file device applied to the conventional optical disc file method. 11 is an optical head control mechanism that controls the optical head 1; 12 is a linear motor control circuit that performs feedback control of a linear motor drive circuit (not shown); and 13 is a rotation signal from the rotation motor generated by the rotation mechanism 3. A rotary motor control circuit that controls the motor to rotate at a constant rotation speed;
4 is an eccentricity correction circuit that detects the amount of eccentricity during rotation of the optical disk medium 20 and performs feedback control of the linear motor control circuit 12 and the optical head control mechanism 11; 5 is a drive control central processing word W (hereinafter referred to as CP); 6 is a drive interface circuit, which interfaces with the host CPU. 7 is an autoloading mechanism.

FIG. 9 shows the l-rack configuration on the optical disk medium 20, 21 is a track, 50 is a sector, FIG. 10 is a layout diagram of a trunk, which is composed of a guard track, a backup track, and a user track, The backup track is the alternative track area 30, and the user track is the user recording area 40.

FIG. 11 shows the trunk format, where 50 is a sector and 51 is a S M (Section Marker).
) field, 52 is the I D (Identifica
tion) field, 53 a flag (FLAG) field, 54 a data (DATA) field, and 55 a gap (GAP).

Next, the operation will be explained. Optical head 1 shown in FIG.
is composed of a semiconductor laser, a focusing optical system, a focus error detection system, a tracking error detection system, a signal detection system, and an objective lens drive system, and the infrared light emitted from the semiconductor laser is reflected on the recording film of the optical disk medium 20. , a focus error detection system, and a tracking error detection system (none of which are shown) generate respective error signals.

The actuator 2 is a linear motor that drives the optical head 1, and is composed of a sensor that detects the speed and position of the near motor.Actuator 2 controls the drive of the linear motor based on the speed and position signals detected by the sensor, and drives the optical head 1. move it to the position.

The rotation mechanism 3 is composed of a rotation motor and an optical disk attachment/detachment mechanism, and rotates the optical disk medium 20 mounted on the motor shaft counterclockwise at a constant rotation speed when viewed from the optical head 1 side.

When recording data on the optical disk medium 20, the optical head control mechanism II forms a bit string on the optical disk medium 20 by turning the laser beam ON10FF in response to a modulation signal sent from the drive system JCPU 5.

Furthermore, during data reproduction, the optical head control mechanism 11 controls the amount of light while monitoring the amount of laser light, reads out the presence or absence of bits as the intensity of the reflected light from the optical disk medium 2o, converts it into a binary value, and sends it to the drive interface circuit 6. .

Further, the optical head control mechanism 11 performs feedback control based on the focus error signal detected by the focus error detection system of the optical head 1, drives the objective lens, and focuses the laser beam correctly on the recording film of the optical disk medium 2°. Let it shine.

Further, the optical head control mechanism 11 performs feedback control using the tracking error detection system of the optical head 1, drives the objective lens, and causes the focused spot to follow the trunk on the recording film of the optical disk medium 20.

The linear motor control circuit 12 performs feedback control of the linear motor drive circuit based on a detection signal from a sensor that detects the position of the optical head 1, and moves the optical head to a target position.

The eccentricity correction circuit 4 detects the amount of eccentricity during rotation of the optical disk medium 20 and performs feedback control of the linear motor control circuit 12 and the optical head control mechanism 11.

The rotary motor control circuit 13 controls the motor to rotate at a constant rotation speed based on a rotation signal of the rotary motor generated by the rotation mechanism 3.

On the other hand, the drive system 1cPU5 receives commands from the host CP tJ, sends status to the host CPU, and by switching and combining various control circuits,
The optical disc file device is caused to perform various operations.

The drive interface circuit 6 communicates between the optical disc file device and the host CPU.

The autoloading mechanism 7 automatically pulls the optical disk cassette containing the optical disk medium 20 inserted halfway into the device and takes it to the spindle motor/turntable. When,
The shutter window of cassette 1- opens at the same time as the insertion. Further, when ejecting the cassette, the cassette is automatically ejected by operating an ejection button (not shown).

The optical disc medium 20 has tracks 21 arranged in a continuous spiral as shown in FIG. 9, for example, and is divided into a plurality of sectors 50 with a certain position in the radial direction as a base point.

Each track 21 is assigned an equal number of sectors 50. Figure 10 shows an example of the track configuration, and Figure 11 shows an example of the track configuration.
Examples of track formats are shown in the figures.

As shown in FIG. 10, the optical disc medium 20 is divided into a backup track area 30 and a user track area 40.

The track format is shown in FIG. 11, and one track physically consists of 17 sectors from 0 to 16 sectors.

In the user recording area 40, alternative sectors are allocated at a rate of one sector per track.
Sixteen sectors per track are used as user sectors.

Sequential numbers starting from 0 are given to the user sectors as logical block addresses (sector addresses) in order from the first sector of the first track (innermost one track) of the user recording area 40.

One sector consists of a 3M field 51, a TD field 52,
It consists of a flag field 53, a data field 54, and a gap 55.

The ID field 52 consists of IDI and ID2, and each ID includes a physical track number and a physical sector number.

The flag field 53 contains the WRT flag (WRTFLAG
), which indicates whether the data field 54 of the sector has been written.

Data field 54 includes 1024 bytes of user data, ECC (Error Correction Number)/CRC (Cycle Link Redundancy Check), ID3, and a pointer.

11) In 3, the contents of II] ■ and II) 2 are recorded. If the pointer is a backup sector or a sector in alternate track 30, the pointer is the ID of the original sector.
Record (TDI/ID2).

In order to record a plurality of files of data on this optical disk medium 20, an example of recording three files is shown in FIG. EOF (E
ND OFF File), then place two or more EOFs after the last file.

Here, the EOF uses, for example, a blank sector (flag field, WRT flag indicates whether or not to write).

The procedures for searching and reading files, additionally writing, and creating a list for such an optical disk medium 20 will be described below.

(a) File search and read host CP [When searching and reading the n-th file n (n≧1) according to the file search and read instruction from J, if n-1 (file 1), the beginning of the user recording area 40 The recorded information is read from the sector with the logical zo 1 tonk address 0 to before the EOF.

When n≧2, the data is read sequentially starting from the sector with the logical block address O, and from the next sector where n-1 EOFs have been read, the recorded information is read to the front of the EOF.

2 consecutive EOFs before reading n-1 EOFs
is found, the specified file is assumed to be missing.

(b) File additional writing host) According to the file additional writing instruction from the CPU,
Recorded information is read starting from the sector with logical block address 0, which is the beginning of the user recording area 40.

If the sector with logical block address 0 is F and OF, then the sector with logical block address 0, otherwise the second EO of the first consecutive EOF after logical block address O.
Sector F is set as an additional write start sector, and when there are two or more sectors remaining even after all data is written in the remaining sectors, data is written starting from the start sector.

(C) File-list creation In response to a file-list creation instruction from the host 1-CPU, information on file 1 is obtained from the recorded information in the sector of logical block address O.

Next, skip sectors until reading “E OF”, and then read E
The information of file 2 is obtained from the recorded information of the next sector of OF.

Continue this operation until you find a continuous EOF,
Obtained file 1. File 2. . . . Create a file list based on the information of file n and send it to the host CPU.

Here, it is assumed that the information necessary for creating the file list is stored in the first sector of the file.

[Problem to be solved by the invention]

Conventional optical disk file methods are structured as described above, so when accessing a file, the corresponding file must be searched by the number of EOFs from the beginning, and when adding a file, consecutive E
It is necessary to find the OF and overwrite the next file from the second EOF, and when creating a list of files on the medium, searching the entire medium, searching for files, reading, additional writing, - There were problems such as the time it took to create a list.

This invention was made in order to solve the above-mentioned problems, and provides an optical disc file method that can quickly perform search reading, additional writing, and list creation of a large number of files written on an optical disc medium. The purpose is to

[Means to solve the problem]

The optical disc file method according to the present invention divides a track into an index track and a file track in a user recording area on an optical disc medium, and when recording data, information of the first sector including the file header of the file is transferred to the last sector in the index track. Write the rest to the file track, store the first sector address and last sector address of the data stored in the file track in the file header, and write the next index i rack in the last sector of the index track. It is designed to store the first sector address of .

[For production]

The optical disk file method of the present invention refers to the index track when searching for file information recorded on an optical disk medium by file name, thereby performing file search/reading, additional writing, and list creation. Execute.

〔Example〕

An embodiment of the present invention will be described below. 1st
In the figure, 30 is an alternative track area, 41 is an index track, 42 is a file track, and 43 is an empty track, and the index track 41, file track 42, and empty track 43 are placed on the user recording area.

18624) racks are allocated with index track 41, file track 42 and empty track 43,
128 tracks are allocated to the alternative track area 30.

In FIG. 2, a header section 61 stores header information of a file, and a data section 62 stores data information of a file. The header section 61 has a storage capacity of 32 bytes, and the data section 62 has a storage capacity of 1 byte.

In FIG. 3, 71 is the first sector address, which is the first logical block address where the file is recorded, and has a storage capacity of 2 bytes.

Further, 72 is the final sector address, which is the final logical block address where the file is recorded, and has a storage capacity of 2 bytes.

73 is a file name and has a storage capacity of 16 bytes, and 74 is a file attribute in which information unique to the file is stored (the storage capacity is 12 bytes).

The functional blocks applied to this invention are the same as in the conventional case shown in FIG. 8, and the track configuration is also the same as in the conventional case shown in FIG. The index track configuration is the same as that shown in the track format of FIG. 1I, and the same parts in FIG. 4 as in FIG. 11 are given the same reference numerals.

Next, the operation will be explained. As shown in the track layout diagram of FIG. 1O, the optical disc medium 20 of FIG. 8 is divided into an alternative track area 30 and a user recording area 40, and the user recording area 40 is further divided into an index track 41, a file track 42, and an empty track 43.

FIG. 4 shows an example of the configuration of the index track, where the index track includes sectors 5CTO to 5CT.
14 is a sector for storing data, sector 5CT15 is used as a next index track indicating sector, and sector 5CT16 is used as an alternative sector.

To record a plurality of data files as files on the optical disk medium 20, write the first sector including the header part of the file in the empty sector at the beginning of data storage sectors 5CTO to 5CT14 in the index track 41. For file information exceeding 1 sector, information exceeding 1 sector of the file is recorded from the first track of the file track 42, and an EOF is recorded between files on the file track 42, and 2 or more EOFs are recorded in the last file. put Here, E OF uses, for example, a blank sector.

The procedures for searching and reading files, additionally writing, and creating a list for such an optical disk medium 20 will be described below.

(A) File Search and Read FIG. 5 shows a flowchart of file search and read. In response to a file search and read instruction from the host CPU, a file matching the file name specified by the host CPU is searched.

First, in step STI, the optical head 1 shown in FIG.
moves to the first logical block address (hereinafter referred to as LBA), and sets an initial value O to a counter i that sets the number of searches for the index track 41 in step ST2,
Sector 50 is read in step ST3.

If it is not EOF in step ST4, the header part 61 in FIG. 2 is checked in step ST5, and if there is a file with the same file name 73 in FIG. obtain.

If the file names 73 do not match in step ST5, preparations are made to read the next sector 50 in step ST6, that is, the counter i is incremented by 1, the number of searches is checked in step ST7, and the last data storage sector 5C is read.
If T14 is not read (i=15), the process returns to step ST3.

When it is confirmed in this step ST7 that the number of searches has reached 15 (when i=15), the data storage sector 5C is
Since it indicates that there is no match in TO~5CT14, the index track instruction sector 5CT15 is read in step ST8, and the EO is read in step ST9.
A check is made to see if it is F or not, and if it is EOF, the file is determined to be absent. If not EOF, step 5
At T10, the optical head °1 shown in FIG. 8 is moved I track to search for the next index track 41.

In addition, in step ST5, if the file names 73 of the header part 61 match, the host CPU sends the file information of one sector from that sector, for example, 1024 bytes, to the host CPU.
(Step 5TII).

If the file size exceeds 1024 bytes,
In step 5T12, the optical head 1 is moved to the sector indicated by the first sector address 71 in the header section 61, and then moved to the sector indicated by the last sector address 72 in step 5T12.
T13. The record of sector 50 is read through step 5T14, and sent as host CPU error aisle information at step 5T15, and when T, .

If there is no corresponding file, host the error information)C
Send to PU.

(B) File additional writing FIG. 6 shows a flowchart of file additional writing. First, in step ST21, the optical head 1 is moved to L B A at the beginning of the index track 41 at the beginning of the user recording area 40, and in step 5T22. The sector 50 is read in the process from step ST23 to step ST23, and when the sector 50 is read in step ST23, the read sector becomes EOF in step 5T24.
Test whether it is true or not eight times.

In step 5T24, if it is not EOF, advance the reading target by one sector in step 5T25, and if the result of reading 15 sectors in step 5T26 is not EOF, repeat the process of reading the next sector 50 in step 5T23 to read EOF. search for.

When the determination in step ST26 is yes, E OF is applied to sectors 5CTO to 5CT14 of the index track 41.
Since this indicates that there is no index track indication sector 5CT15 in step ST27.

In step 5T28, it is checked whether the read sector is EOF, and if it is not EOF, the optical head is moved to the next index track 41 in step 5T29, and the read sector is EOF.
'The process of searching for sector 50 is repeated.

Also, as determined in step 5T24, sector 5CTO-
If EOF is found in 3CT14, step S
In T33, the LBA of the sector is stored in WBA, and if the EOF is found in the index track designation sector 5CT15 as determined in step ST2B, the first track of the empty track 43 is set as the index track 41 in step ST30°Sr11. , in step 5T32, I-,B of the sector 5CTO
A is written to the index track instruction sector 5CT15, and in step 5T33, the LBA
is stored in WBA.

In step 5T34, the first 1024 bytes of data transferred from the host CPU are temporarily stored.

In step 5T35, after moving the optical head to the first sector of the next track, if the LBA stored in step 5T36 is sector 5CTO of the index track 41, the beginning of the empty track 43 is set as the file track 42, and the process moves to step ST41. Therefore, the optical head l is moved to the LBA of the first sector. In step 5T36, in the index track 41, E
When it is determined that sector 5CTi which was OF is i=1 to 14, sector 5CTi which is the first sector of the file corresponding to sector 5CTi-1 (file immediately before EOF) of the data read in step 5T23 -1
Sector 5 from the final sector address 72 contained in
r of the second EOF that read 0 and detected two consecutive EOFs in steps ST37 to ST40.
Move the optical head 1 to B A and read the file information 1o24 sent from the host CPU in step ST42.
The data exceeding the byte is received and written to the optical disk medium 20 in step ST42.

In step ST43, it is checked whether data has been written to the sector 5CT14 of the file track during data writing. If YES, the first track of the empty track 43 is added to the file 42 in step ST44.

In step ST45, it is checked whether the data writing is completed, and when the writing is completed, in step ST46, the write start I, BA, and write end LBA are stored as the start sector address 71 and the end sector address 72 of the header section 61, respectively. Step ST4
7, the optical head 1 is moved to the index track 41.
The header section is moved to the first EOF sector in step 5T4B.

(C) Creating a file list FIG. 7 shows a flowchart for creating a file list. First, in step ST51, the optical head 1 is moved to LBA at the beginning of the index track at the beginning of the user recording area 40. , reads sector 50 in steps 5T52 and 5T53.

If the read result is not EOF in step ST54, the header portion 61 of the read information is sent to the host CPU as file list information in step 5T55.

Next, in step 5T56, preparations are made for reading the next sector, and in step ST57, the sector 5CT is read.
After confirming that there is no EOF with O-3CT14 (i=
15) At step 5T58, the index track indication sector 5CT15 is read, and at step 5T59
If it is not EOF, the next index track 71 is searched for in step ST60, and the same process is repeated until F or OF is found in sectors 5CTO-3CTI4 or sector SC'F15 of the next index track 71.

In addition, Fig. 8 is a functional block diagram, Fig. 9 is a truck configuration,
The track format shown in FIG. 11 has the same function as the conventional optical disc file method, so the explanation thereof will be omitted.

In the above embodiment, the header section 61 is 32 bytes, but the number of bytes of the header section 61 can be increased or decreased up to 1024 bytes.

Also, one track 16 is used as the index track 41.
Although an example is shown in which the index track 41 is composed of sectors, the index track 41 may be composed of a plurality of tracks, for example, 4 tracks and 64 sectors.

Although an example of a configuration in which the index track 41 and the file track 42 are mixed is briefly shown, the index track 41 is arranged, for example, from the beginning of the user recording area to
28 tracks and thereafter may be configured as file tracks 42. In either case, the same effects as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, the user recording area on the optical disc medium is divided into an index track, a file track, and an empty track, and the header part of a file is stored in the index track as one file and one sector. , file search and reading, additional writing, and file search in the process of creating a list only need to search the index track, which has the effect of providing a high access speed.

[Brief explanation of the drawing]

FIG. 1 is a track configuration diagram applied to an optical disc file method according to an embodiment of the present invention, FIG. 2 is a file internal configuration diagram applied to the same embodiment, and FIG. 3 is a diagram applied to the same embodiment. 4 is an index track configuration diagram applied to the above embodiment, FIG. 5 is a file search and reading flowchart for explaining the above embodiment, and FIG. 6 is a diagram for explaining the above embodiment. FIG. 7 is a flowchart for creating a file list for explaining the above embodiment; FIG. 8 is a flowchart for creating a file list.
The figure is a functional block diagram of an optical disk file device applied to the conventional optical disk file method and the optical disk file method of the present invention, FIG. 9 is a configuration diagram of an optical disk track applied to the same-h optical disk file device, and FIG. 10 is the same track as above. Figure 11 shows the format of the same track, 1st
FIG. 2 is an explanatory diagram of a file recording method in a conventional optical file method. ■ is the optical head, 2 is the actuator, 3 is the rotation mechanism,
4 is an eccentricity correction circuit, 5 is a drive control CPU, 6 is a drive interface circuit, 7 is an autoloading mechanism, 11 is an optical head control mechanism, 12 is a linear motor control circuit, 13 is a rotary motor control circuit, and 20 is an optical disk medium. , 21 is a track, 41 is an index track, 4
2 is a file track, 43 is an empty track, 50 is a sector, 61 is a header section, 71 is a first sector address, 72
is the final sector address. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation Q 3rd

Claims (1)

[Claims] When inputting and outputting data to an optical disk medium that is removably attachable to an optical disk file device and capable of writing and reading data in sector units of a predetermined byte, a header section of the sector size or less and a data section are used as the input/output unit of the data. A track consisting of a predetermined sector is divided into an index track and a file track in the user recording area on the optical disc medium, using a file consisting of the following:
When writing the above file to the optical disk medium, the first sector worth of data including the header section is placed in an empty sector other than the last sector in the index track, and the data section of the file exceeding 1 sector is placed at the beginning of the file track. The header of the above file contains information on the file name and the first sector address and last sector address of the data included in the file track, and the last sector of the above index track contains the first sector of the next index track. An optical disc file method in which address information is stored and a file on the optical disc medium is searched by file name only by searching the index track.