JPH04106643A - System for managing file area of floppy disk - Google Patents

Abstract

PURPOSE:To prevent the occurrence of such a case that writing and reading on and from a floppy disk become impossible due to the hardware error of a file area management table (FAT) by providing two FATs having the same control information in the file system of the floppy disk. CONSTITUTION:The file system 2 of a floppy disk controlling section 1 manages control information corresponding to all clusters on a floppy disk medium 6 in accordance with a directory 5 on the medium 6 and two file area management tables FAT A 3 and FAT B 4 in order to manage names and all information of files. Thus two FATs A 3 and B 4 having the same control information are provided. Therefore, even when a hardware error occurs in the FAT A 3, the file system 2 can make data reading and writing from and on the floppy disk by reading the FAT B 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a file area management system for a floppy disk in an information processing apparatus.

[Conventional technology]

Conventionally, in this type of floppy disk file area management method, the floppy disk file system consists of one file area management table (hereinafter referred to as FAT).
It was managed by

[Problem to be solved by the invention]

In the conventional floppy disk file area management method described above, the floppy disk file system manages the file area using only one FAT, so if a hardware error occurs in the FAT, the floppy disk cannot be read or written (it cannot be recovered). ).

[Means to solve the problem]

The floppy disk file area management method of the present invention is characterized in that the floppy disk file system includes two FATs having the same control information.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

The file system 2 of the floppy disk control unit 1 in the information processing device uses a directory 5 and a file area management table (hereinafter F) on the floppy disk medium 6 to manage file names and all information about the files.
Two management tables called ATA3 and FATB4 manage control information corresponding to all clusters (minimum unit of area reservation/release, used/unused area) on the disk. Directory 5 contains the names, attributes, and locations of all files stored on the disk (
(first cluster number), FATA3 and FATB
4 indicates whether the disk area is used or not, and also indicates which area is used by each file. File system 2
reads FATA3 when the disk is first accessed, and writes back to FATA3 and FATB4 as necessary when updating the FAT. In this embodiment, by providing two FATA3 and FATB4 that have the same control information, even if a hardware error occurs in FATA3, the file system 2 will read FATB4 so that reading and writing of data on the floppy disk will be prevented. It will not be possible.

[Effects of the Invention] As explained above, the present invention has the effect of being able to prevent a floppy disk from becoming incapable of being read or written due to a FAT hardware error.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Floppy disk control unit, 2... File system, 3, 4... File area management table (F
ATA, FAFB), 5...Directory, 6...
floppy disk medium.

Claims (1)

[Claims] A floppy disk file area management method characterized in that a floppy disk file system is provided with two file area management tables having the same control information.