JPS6391887A - Data recording system - Google Patents

Abstract

PURPOSE:To execute file control by reading out a directory which has been recorded in a data part, even if a defective directory exists in a directory part, by recording at least a part of directory information for executing a file management, in the data part. CONSTITUTION:A file 4 is formed by data tracks 21-23, and directory information of the file 4 is recorded in a directory part 31. The information of the directory part 31 is recorded in a tip recording area 5 of the file 4. That is to say, since the directory information is recorded at every file, the directory information is not recorded overlappingly, comparing with the case when it is recorded in each data track, and a data part can be used efficiently. In this way, even if an important directory for executing a file management is damaged and read becomes impossible, the directory can be recovered by the information recorded in the data part, and the data file is not damaged.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data recording system, and in particular to a data file (
The present invention relates to a data recording method using an information recording medium having a data section for recording a file (hereinafter referred to as a file) and a directory section for recording directory information for file management of this file.

[Prior Art] Conventionally, known information recording media include floppy disks that record and reproduce information using magnetism, and optical information recording media (hereinafter referred to as optical cards) that record and reproduce information using light. ing.

These information recording media use auxiliary data, so-called directories, for managing data file by file in order to store large amounts of data. Usually, file information such as a file name, file length, and first data track number is written in the directory to manage files in the data track section.

The above-mentioned optical cards, especially non-erasable write-once optical cards, have a large storage capacity even though they are about the size of a credit card. The dimensions of a credit card are approximately 8
If the information track pitch is 20 pm and the recording length of 1 bit is 5 mm, then the number of tracks is 55 x (1000 ÷ 20) = 2750 (Thu) 8 bits/track 85 x (1000 ÷ 5). )=17000 (bit) Byte capacity/track 17000÷8. ．． 2000 (bytes). Therefore, the total data capacity is 2750×2000=5500000=5.5 (MB).

In order to manage such a large amount of information, an information management method using a directory is required.

FIG. 7 is a schematic plan view showing an example of an optical card.

As shown in FIG. 7, the optical card 1 has a data section 10 (101, 102) consisting of data tracks.

Association..., 1on) and Directory Department 20 (201, 20
2, ·e*, 20n) are provided, and data is written in the data section 10 from the top of the optical card 1 in the E direction, and directory information as data management information is added in the directory section 20 from the bottom of the optical card 1 in the D direction. Write in the formula.

[Problems to be Solved by the Invention] In the above directory management system, if even a part of the directory is damaged and becomes unreadable,
Because file control information disappears, file control becomes impossible even though the contents of the data section can be read normally, resulting in a large amount of the contents of the data section being damaged. There was a point.

An object of the present invention is to provide an information recording system that can correctly read the data portion corresponding to a defective directory even if the directory has a defect.

[Means for solving the problem] The above problem can be solved by using an information recording medium having a data section for recording data files and a directory section for recording directory information for file management of this data file. The problem is solved by the data recording method of the present invention, which is characterized in that at least a part of the directory information is recorded in the data section.

[Operation] The present invention records at least a part of directory information for file management in the data section, so that
Even if a defective directory exists in the directory section, the directory recorded in the data section is read out and file control can be performed using iIT.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

Note that in the following description, an optical card will be taken up as an example of an information recording medium.

First, a configuration example of an information recording/reproducing apparatus used in the data recording method of the present invention will be described.

FIG. 6 is a schematic diagram of an example of the configuration of an information recording 11 generation device used for unreleased IJJ.

An information recording/reproducing device (hereinafter referred to as a drive) 31 is connected to a higher-level control device (hereinafter referred to as a host) 32, and performs data communication, control, etc. between the drive 31 and the host 32. The MPU 33 in the drive 31 is ROM, RAM
It mainly controls the card feed motor 37 and head feed motor 36, and the A T/A F control circuit 34.
receives the signal from the photodetector 39 and activates the AF actuator 40.
, drives the AT actuator 41. Further, the modulation/demodulation circuit 35 performs recording by changing the emission intensity of the light source 38 during recording, and detects light during playback (39-i).
) data is demodulated based on the signal. The host 32 transmits and receives data to and from the drive 31, and controls writing and reading operations of information in the directory section and data section of the optical card 1-1-.

Next, a directory recording method and a directory reproducing method according to an embodiment of the data recording method of the present invention will be explained using a flowchart.

FIG. 1 is a flowchart showing a directory recording method.

FIG. 3 is an explanatory diagram showing the data section.6 FIG. 4 is an explanatory diagram showing the directory section.

As shown in FIG. 1, step Tl, step T2
Track 4 of the file data in order from the beginning of the file.
rj, and the final data is recorded in step T3. As shown in FIG. 3, this file data includes user data (data that the user program attempts to record) and some information related to the user data that is automatically added by the host 32 for each track. In this embodiment, one file consists of m data tracks (1001
~100 shoes).

Thereafter, in step T4, a directory is recorded in the directory section. As shown in Figure 4, directory 2
00 usually includes information such as the file name 201 and date 202, as well as information indicating the size and length of the file data 203.

The same information as this directory is added to the above file data, but information indicating the data size is not added except for the final track data, or a recording area indicating the data size is provided. This is to deal with a system in which the file size is not determined until the last data is recorded, that is, a data-variable file.

By recording information indicating the size of file data only on the last track, it is used for data recovery when a directory, which will be described later, is unreadable.

The method for reproducing the directory section of the optical card recorded using the method described in L is performed as follows.

FIG. 2 is a flowchart showing a directory playback method.

As shown in FIG. 2, the directory is read in step St, and it is checked in step S2 whether there is a read error. If the reading is successful, the file data recorded in the data section is read. If there is a reading error in step S2, the process proceeds to step S3 and subsequent directory recovery processing.

As mentioned above, in this embodiment, the directory part and the data part are written in the append format, so the next track of the file indicated by the directory before the error directory is the beginning of the file indicated by the error directory. It is a data track. Therefore, step S3
In step S4, the directory before the directory in which the reading error occurred is read, and in step S4, the first data track of the file indicated by the directory in which the error occurred, determined in step S3, is read. Based on the directory information written in each data track, it is determined in step S5 whether the information is the end of the file. If it's not the last
Go to read the next data track in step S6,
Repeat from step S5. If the track is the last in step S5, the file length is determined depending on how many tracks have been read, and the process goes to step S7, where the directory can be recovered.

In this example, the file length is determined when all data tracks have been written, so the file length was not included in the directory information written in the data section, but in a system where the file length is determined from the beginning. In step S5. in FIG. 2, the file length is written in the directory information of the data section. S.S.
can be omitted.

In addition, in FIG. 2, step S3. S
Although the determination was made by reading the directory before the error directory in step 4, the same result can be achieved by reading the directory after the error directory.

-1 In the first embodiment, the directory information of each data track was recorded on each data track, but
It is also possible to record directory information for each file in a part of the data section.

FIG. 5 is a schematic plan view of an optical card in which directory information is recorded in the data section for each file.

As shown in the figure, a data track 21.

File 4 is formed in 22 and 23, and the directory information of file 4 is recorded in the directory section 31. Information in the directory section 31 is recorded in the leading recording area 5 of the file 4. In this embodiment, directory information is recorded for each file, so compared to the case where directory information is recorded on each data track, there is no need to record directory information redundantly. can be used.

Note that the directory recording/reproducing method is the same as that of the above-described embodiment, so a description thereof will be omitted.

In this embodiment, the information of the directory section is recorded in the leading recording area of the file1, but it may be recorded at any location in the data section of the file as long as it is a predetermined location.

[Effects of the Invention] As explained above in detail, according to the data recording method according to the present invention, even if a directory important for file management in the data section is damaged and becomes unreadable, the data section can still be saved. The information recorded in the directory allows the directory to be recovered without damaging the data files. As a result, highly secure data recording can be performed.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a directory recording method. FIG. 2 is a flowchart showing a directory playback method. FIG. 3 is an explanatory diagram showing the data section. FIG. 4 is an explanatory diagram showing the directory section. FIG. 5 is a schematic plan view of an optical card in which directory information is recorded in the data section for each file. FIG. 6 is a schematic diagram of an example of the configuration of an information recording/reproducing apparatus used in the present invention. FIG. 7 is a schematic top view showing an example of an optical card. 3111...e*drive 32, fist pot 11@11 host 1001-100m race φ, data track 200-ψ,
lI◆・Directory 51-57 T1-T4 ・SoΦ・II-Step agent Patent attorney Jo Yamashita Figure 2 Figure 3 Figure 4 Figure 20+ 202 205
Figure 5 et al. Figure 6 Figure 7

Claims (1)

[Claims] In a data recording method using an information recording medium having a data section for recording a data file and a directory section for recording directory information for file management of the data file, at least the directory information is provided. A data recording method characterized in that part of the data is recorded in the data section. (2) The data recording method according to claim 1, wherein the data section is composed of data tracks, and at least a part of the directory information of each data track is recorded in each data track. (3) The data recording method according to claim 1, wherein at least a part of the directory information of the data file is recorded in a part of the data section of the data file.