JPS6387680A - Data recording system - Google Patents

Abstract

PURPOSE:To facilitate the management of the error correction of field data by recording information related to the error correction of information, which is recorded in a data part, in a directory part. CONSTITUTION:In case of addition of error correction code (ECC) information 24 to a directory 20, one-track components of original data are converted to data with ECC, and data is recorded on the data track of an optical card. It is discriminated whether all data of a file are already recorded or not and after the final data track of the file is recorded directory data related to the recorded file is converted to data with ECC, and converted data is recorded on the directory part 20 of the optical card. Thus, the error correction of the file is managed with the slight number of data bits.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data recording system, and in particular to a data section capable of recording information with error correction capability, and a file of information recorded in this data section. The present invention relates to a data recording method using an information recording medium having a directory section for recording directory information for management.

[Prior Art] Conventionally, information recording media include floppy disks, which use magnetism to perform recording and reproduction, and optical information recording media (hereinafter referred to as optical carts), which perform recording and reproduction by using light. ) etc. is known.

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

The above-mentioned optical cart, especially a non-erasable FI write-once optical card, has a large storage capacity even though it is about the size of a credit card. The dimensions of Qureshi Sotocart are:
There is approximately 85 am x 55 IBM, and if the information track pitch is 20 islands and the recording length of 1 bit is 5 #Lm, the number of tracks is 55 x (1000 ÷ 20) = 2750 (Thu) bit capacity / track 85 x (1000÷5) = 17000 (bi
t) Byte capacity/track 17000 ÷ 8 wells 2000 (bytes). Therefore, the total data capacity is 2750x2000 = 5500000 = 5.5 (MB).

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

FIG. 5 is a schematic plan view showing an example of an optical cart.

As shown in FIG. 5, the optical cart 1 has a data section 10 (101, 102°..., to
n) and the directory section 20 (201°202,...
.

Each data section 101 to Ion above is a track number, FCC
It is divided into a track information section 11 in which information etc. are recorded and a data recording section 12. In other words, for information recording media such as optical carts, which have a high error rate of recorded data, error correction method 1 is required.
F as ECC (Floror-Correction
-Code) is added to the data, and error correction is performed on a track-by-track basis. This E
CC either has a very high error correction capability or uses a large portion of the data section. Therefore, data that does not require high quality data, such as image information and music information, is recorded on an information recording medium as raw data without adding FCC.

Since the data portion to which FCC is added and the data portion of raw data which is not added have different data processing methods during recording and reproduction, information is required to distinguish between the data portion with ECC and the data portion without ECC. -Track information section 11
Information indicating the presence or absence of this F, CG is recorded,
As mentioned above, the data section 10 as well as the data recording section 12
will be recorded.

[Problems to be Solved by the Invention] As described above, when files are managed using directories, it may be necessary to record files that handle data without ECC.

However, in conventional data recording systems, information on the presence or absence of ECC is recorded for each data track, and even though directories are used for file management,
The problem is that the data track must be read in order to check the presence or absence of ECC.

The first object of the present invention relates to a data recording method that is suitably used when files are managed using directories and file data is provided with error correction capability.

[Means for solving the problem] The above problem is caused by a data section that can record information with error correction cooperation, and a directory information for file management of the information recorded in this data section. The problem is solved by a data recording method using an information recording medium having a directory section, which is characterized in that information regarding error correction of information recorded in the data section is recorded in the directory section.

[Operation] By recording information regarding error correction of information recorded in the data section in the directory section, the present invention can manage file error correction without reproducing the data section.
This is done by playing back the directory section.

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

In the following description, an optical cart will be used as an example of the 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. 4 is a schematic diagram of an example of the configuration of an information recording/reproducing apparatus used in the present invention.

An information recording and reproducing device (hereinafter referred to as trife) 31 is connected to a third-party control device (hereinafter referred to as host) 32,
Data communication, control, etc. are performed between the trife 31 and the host 32. The MPU 33 in the drive 31 is a ROM, R
Cart feed motor with built-in AM 37. Mainly controls the head feed motor 36, and the AT/AF control circuit 34
receives the signal from the photodetector 39 and activates the AF actuator 40.
．． AT actuator 41 is driven. Furthermore, the modulation/demodulation circuit 35 executes recording by changing the emission intensity of the light source 38 during recording, and demodulates data based on the signal from the photodetector 39 during reproduction. Host 32 is Trites 31
The optical cart 1 performs information recording and reproducing operations for each data track. This optical card 1 has a high error rate due to the nature of the medium, and if highly reliable information is required, an error correction means is required.

FIG. 3 is an explanatory diagram showing the contents of the directory 20.

As shown in the figure, information regarding a file name 21, a first track number 22, a file size 23, etc. is usually recorded in the directory 20. In the present invention, ECC information 24 is added to the directory 20. This ECC information 24 indicates the presence or absence of FCC on the data track of the file indicated by the directory 20, and may be sufficient to add just one bit of data.

Next, a method for recording information on an optical card in the file management system using the above directory will be explained using a flowchart.

FIG. 1 is a flowchart showing a data recording method according to the present invention.

As shown in the figure, it is determined whether or not to add an FCC to the file name of the Sl file, and if it is not added, the process goes to S3. When adding, use S2 to add l tracks of raw data to F.
The data is converted into CC-attached data, and the data is recorded on the data track of the optical cart in S3.

At step S4, it is determined whether all data of the file has been recorded or not. If there is data to be recorded, the above operations are repeated from step S1. After recording the final data track of the file, the program goes to 95 to convert the directory data related to the recorded file into data with FCC, and records the converted data in S5 in the directory section of the optical cart in S6.

Next, a method for reproducing files recorded using the above method will be explained.

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

As shown in the figure, the TI reads directory data from the directory section of the optical card, and the T2 converts the FCC data to raw data.

At T3, based on the dictionary information obtained from T2, L
The target data track is read, and at T4 it is determined whether the data has FCC or not, based on the FCC information in the directory. If there is no FCC, the process goes to T6.

If the data has FCC, T5 converts the ECC data to raw data. At T6, it is determined whether or not the data track has been read until the end of the file. If the data track has not been read yet, the above operation is repeated from T3.

[Effects of the Invention] As explained in detail above, according to the data recording method of the present invention, by recording information regarding file error correction in the directory, it is possible to manage file error correction using only a few data bits. In addition, there is no need to record information regarding error correction in the data section, and as a result, there is no need to judge whether or not to use error correction for each data track during playback, so playback time can be shortened. can.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a data recording method according to the present invention. FIG. 2 is a flowchart showing a file playback method. FIG. 3 is an explanatory diagram showing the contents of the directory 20. FIG. 4 is a schematic diagram of an example of the configuration of an information recording/reproducing apparatus used in the present invention. FIG. 5 is a schematic plan view showing an example of an optical cart. 31...Drive 32...Host 101 to Ion...Data Department 20...Directory Department Agent Patent Attorney Jo Yamashita Hei 1 Figure Procedure Amendment 1988 47121

Claims (1)

[Claims] A data section capable of recording information with error correction capability;
In a data recording method using an information recording medium having a directory section for recording directory information for file management of the information recorded in the data section, information regarding error correction of the information recorded in the data section is stored in the directory section. A data recording method that is characterized by recording data in sections.