JPH05290514A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To always recover a previous condition even though an initialization is performed provided that no writing is performed to a file, by recovering an FD control work region copied in a non-control region of a file system during an initialization operation. CONSTITUTION:Assume one inadvertently initializes a necessary recording medium (FD) 1, finds his error and wishes to bring it back to the previous condition. If it is right after the initialization and no writing has been done to a file, the FD1 control work region copied in a non-control region of the file system is read by a reading circuit 2 in the initialization operation and the condition is recovered through a writing circuit 4 to the original condition. And by reading a sector header, checking the possibility of performing sector read and write and keeping the contents of the sector data, the original condition is recovered right after the initialization work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing data.

[0002]

2. Description of the Related Art An FD (floppy disk) has been widely used recently as a device for storing data. FD is
Initialization is performed as a pre-stage so that the device can read and write according to the device used. In this initialization operation, the FD is divided into blocks that are finely divided, and a management work area for managing data as a file is created.

[0003]

However, when this initialization is performed, there is a problem that all the data and files in the previously written sector are erased.

The present invention solves the above problems, and an object of the present invention is to provide a recording / reproducing apparatus which can always restore the previous state if a file is not written even after initialization.

[0005]

In order to achieve this object, a recording / reproducing apparatus of the present invention comprises a reading means for reading data from a recording medium, a writing means for writing data on the recording medium, and a temporary storage of data. Memory means to
The program includes memory means for storing a program and operation means for performing an operation based on the program, and the program saves a management work area of a file in a non-management area of a file system at the time of initialization of a recording medium, or saves it. The recorded contents are written back to the original, and the sectors are divided into finely divided areas of the recording medium to be read and written.

[0006]

According to the present invention, during the initialization operation, the management work area of the FD is copied to the non-management area of the file system, the data in the sector is not deleted, and it is confirmed that the data can be read. By initializing the data in the management area of, the state before the initialization can be restored.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an example of the structure of the FD described above. FD
In the inner peripheral portion, there is a management area of the file system used in the device, and in the outer peripheral portion, there is a non-management area of the file system which is a physically readable / writable area. A typical example of the file system used in the device is MS-DOS (registered trademark of Microsoft Corporation, USA).

In the FD read / write area, data is concentric and is called a track. This track is divided into areas called sectors, which are divided into several fine blocks. Further, the FD can read and write on the front and back sides. The same track portion on the front and back sides is called a cylinder. In the example of the management area of MS-DOS, the cylinder number is 0 to 76 and the track number is 0 to 1.
Up to 53, the sector numbers are from 1 to 8. Also,
Generally, the equipment or FD itself has a cylinder number of 0.
To 79, track numbers 0 to 159,
Sector numbers from 1 to 9 are possible. Three cylinders of the cylinder numbers 77 to 79, six tracks of the track numbers 154 to 159, and the sector number 9 are non-management areas of the file system.

A work area for the file system is provided at the head of the management area for the file system. here,
This is an area in which the name of the file, the date and time of creation, the size, and information about which part of the management area is written are recorded.

In the initialization in the conventional apparatus, the initialization of the data in the sector of the management area of the file system and the initialization of the data in the work area of the file system were performed, and all the data were deleted.

FIG. 1 shows an example of the structure of a recording / reproducing apparatus of the present invention. 1 is a recording medium, 2 is a reading circuit, 3 is a memory, 4
Is a writing circuit, 5 is a computing unit, and 6 is a ROM (read-only memory) for storing programs. The program for initializing the recording medium 1 is stored in the program ROM 6 and is executed by using the arithmetic unit 5 that performs addition / subtraction, multiplication / division, and read / write control of the memory 3.

First, as the (1) -th step of the initialization work, the track 1 which is the non-management area of the file system of the above example.
Tracks 54 to 159 are written in the recording medium 1 through the write circuit 4 so that the tracks and sector numbers can be physically read and written as sectors 1 to 8. As shown in FIG. 3, each sector data is accompanied by a sector header, and a track number and a sector number are recorded in the header. By reading this part, the data of the specified track and sector is read and written.

(2) Secondly, the work area of the file system is read from the recording medium 1 and read into the memory 3 through the circuit 2. Then, this content is written into the non-management area of the file system of the recording medium 1 through the writing circuit 4. Assuming that the work area is for two tracks, the contents of track 0 are written to track 154, the contents of track 1 are written to track 155, and the (2) th contents are repeated.

(3) Thirdly, the work area of this file system is written in a predetermined format of the device through the read / write circuit 4 to initialize the contents of each sector.

(4) Fourth, the sector headers of cylinders 0 to 76, that is, the tracks 0 to 153 on the front and back surfaces are read to check whether the sector data contents can be read or written. At this time, if the sector header cannot be read correctly, the track is initialized as in the case of the (1) th content. At this time, of course, the contents of the sector data are deleted. Usually, the sector header is often readable correctly, and the contents of the sector data are saved as they are. The recording medium 1 is initialized by the operations (1) to (4).

However, when it is found that the necessary FD has been erroneously initialized and it is desired to restore it again, if the file is not written immediately after the initialization, the following operation can restore the FD. First, sectors 1 to 8 of tracks 154 and 155, which are unmanaged areas of the file system, are read. Then, writing is performed in sectors 1 to 8 of tracks 0 and 1 which are the work area of the file system. The other management areas of the file system remain saved.

As described above, according to this embodiment, the sectors 1 to 8 of the tracks 0 and 1 which are the work areas of the file system are changed to the sectors 1 of the tracks 154 and 155 which are the non-management areas of the file system. By writing up to 8, the other sectors are restored to their original state immediately after the initialization by checking whether the sector can be read and written by reading the sector header and saving the contents of the sector data. It is a recording / reproducing device that can be used.

[0019]

As described above, according to the present invention,
If you find that you have accidentally initialized the necessary FD and want to restore it to the original state again, if you do not write the file immediately after the above initialization, the management work area of the FD will not be saved in the file system after initialization. It is possible to return to the state before the initialization by simply returning the copied portion to the management area, and the practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus in an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration example of a recording medium.

FIG. 3 is a schematic diagram showing a configuration example of tracks on a recording medium.

[Explanation of symbols]

 1 recording medium 2 reading circuit 3 memory 4 writing circuit 5 computing unit 6 program ROM

Claims (1)

[Claims] 1. A reading means for reading data from a recording medium, a writing means for writing data to the recording medium, a memory means for temporarily storing data, a program memory means for storing a program, and a program memory based on the program. The program stores a management work area of a file in a non-management area of a file system at the time of initialization of a recording medium, or contents stored in the non-management area in the management work area. A recording / reproducing apparatus, which writes back data, and reads and writes sectors that are obtained by finely dividing the recording medium.