JPS6346553A - File copying method - Google Patents

Abstract

PURPOSE:To copy files to a different medium despite presence of an unreadable sector by securing such a constitution where a pointer points out a buffer address storing the next unit in case it is impossible to read data equivalent to a single unit out of a memory medium. CONSTITUTION:When the file copy processing is started, a processor clears a read buffer RB14 to zero. Then the data equivalent to a single sector are read out of a floppy disk FD11 as long as it is possible and then written to a memory area of the EB14 indicated by a read pointer Ai. At the same time, the contents Ai of a pointer buffer 13 are pointed and the buffer address storing the next sector is indicated. While if it is impossible to read out data equivalent to a single sector, no data is written to the RB14 and the pointer Ai indicates a buffer address Ai+S that stores the next sector. When the RB14 is filled, the contents of the RB14 are written to an FD12 every sector. This processing is repeated to copy the file of the FD11 to the FD12.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a file copying method, and in particular, when copying a file from a first storage medium to a second storage medium, a file is read into the first storage medium. To provide a file copying method that allows copying of the remaining part after removing the part even if there is an impossible part.

<Prior art> In a system with two disk drives,
Transfer files from the first floppy disk installed in one drive to the second floppy disk installed in the other drive.
It has the ability to copy to a floppy disk.

In a system equipped with such a floppy disk as a storage medium, data can be read/written in l sector units. In file copy, the first
Data for a plurality of sectors is read from one floppy disk and stored in a buffer, and then the plurality of sectors stored in the buffer are sequentially written sector by sector to a second floppy disk.

<Problems to be Solved by the Invention> By the way, in the past, if it became impossible to read a certain sector from the first floppy disk for some reason during the file copy process, the file copy process ended immediately. There was a problem with this. In other words, conventionally, if even one sector making up a file became unreadable, the file could not be read even if all the remaining sectors were normal.
There was a problem that it was not possible to copy to a 0-Sobee disk.

From the foregoing, it is an object of the present invention to provide a file copying method that can copy the remaining file portion to another floppy disk even if there is an unreadable portion in the sector portion constituting the file.

Another object of the present invention is to store an unreadable portion of a first storage medium in a second storage medium so that it can be identified after file copying.
An object of the present invention is to provide a file copying method that can copy files to a storage medium.

Means to solve problems〉 FIG. 1 is a schematic explanatory diagram of the present invention.

11 is a first floppy disk, 12 is a second floppy disk, 13 is a pointer register, and 14 is a read buffer.

Function> Before reading a plurality of sectors of data from the first floppy disk 11 and writing it to the second floppy disk 12, the contents of the read buffer 14 are cleared to zero.

After that, if it is possible to read one sector of data from the floppy disk 11, the data is read and written to the storage area of the Lead Barra Noah 14 pointed to by the pointer, and the contents of the pointer buffer 13 (pointer) are written. point to the buffer address where the next sector will be stored. On the other hand, if it is not possible to read data for one sector, the data is not written to the read buffer 14 and the pointer is used to point to the buffer address where the next sector is to be stored.

When the buffer becomes full, the contents of the buffer are written sector by sector onto the second floppy disk 12.

Thereafter, the above process is repeated to copy the file stored on the first floppy disk to the second floppy disk.

This way, you can copy files to another floppy disk even if there are unreadable sectors.
Moreover, by identifying the all-zero sector, it is possible to recognize that the part is not copied because it cannot be read.

<Example> FIG. 1 is a schematic explanatory diagram of the present invention, and 11 is a first disk drive installed in a first disk drive (not shown).
12 is a second fuco nobby disk attached to a second disk drive (not shown) at +'1fJti, 13 is a pointer register, and 14 is a read buffer.

FIG. 2 is a flowchart of the process of the present invention, and FIG. 3 is an explanatory diagram of the data storage situation of the read buffer. The file copy processing of the present invention will be explained below with reference to FIGS. 1 to 3.

(1) When a file name is input from a keyboard (not shown) and a file copy is requested, the system processor (not shown) clears the contents of the read buffer 14 to zero (see FIG. 3(A)). .

(2) After the data is written, one sector worth of data of the file specified in step (1) is read from the floppy disk 11.

(3) Next, the processor determines whether reading is possible or not, and if reading is not possible, jumps to step (5) and repeats the subsequent processing.

(4) On the other hand, if reading is possible, the data for t read sectors is written to the storage area of the read buffer 14 indicated by the pointer A stored in the pointer register 13.

(5) After writing one sector worth of data to the read buffer 14, or if it is not possible to read the data in step (3), directly write the data to the read buffer 14.
Contents of 3 (pointer) A, updated by 1e next formula % formula %. However, S is the storage capacity for one sector. This causes the pointer to point to the buffer address in the read buffer 14 where the jth sector is to be stored.

(6) After the buffer is loaded, check whether the buffer is full. In other words, the buffer size of data is
Check whether the data has been read from the 70-tuppy disk 11, and if it is not read by the buffer size, step (
2) Repeat the subsequent process.

(7) Read the data equivalent to the buffer size, and if 7\ is saved, write the data that has not been stored in the read buffer 14 sector by sector to the predetermined storage area of the second floppy disk 12. . In addition, FIG. 3(B) shows the contents of the read buffer 14 when all sectors are readable, and FIG. 3(C) shows the contents of the read buffer 14 when the 13th sector is unreadable. =Contents of Dovano 7A14.

If all the data (81!
Determine whether the file copy has been completed (, 7; if not completed, repeat the process from step (1) onwards; if completed, end the file copy process.

Although the present invention is applied to a floppy disk, the present invention is not limited to this and can be applied to other storage media.

<Effects of the Invention> According to the present invention, prior to reading data for a discrete unit from the first storage medium and storing it in the buffer 7a,
The contents of the buffer are cleared by tx, and if it is impossible to read data for one unit, the pointer is configured to point to the buffer at 1 nos that stores the next unit without writing data to the buffer. Therefore, even if there are unreadable sectors, the file can be copied to another floppy disk, and by identifying the all-zero sector, it can be recognized that the part was not copied because it was unreadable. y.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of the present invention; FIG. 2 is a flowchart of the process of the present invention; and FIG. 3 is a diagram depicting the state of data storage in a read buffer. 11...First floppy disk, 12...Second floppy disk, 13...Pointer register, 14...Read buffer (Read buffer) Patent applicant Alps Electric Co., Ltd. Agent
Patent Attorney Chiki Saito Figure 2

Claims (1)

[Scope of Claims] A file copy method that stores data for a plurality of read/write units read from a first storage medium in a buffer, and then writes the data one unit at a time to a second storage medium, comprising: Before reading the plurality of units of data from one storage medium and storing it in the buffer, the contents of the buffer are cleared to zero, and then, if it is possible to read one unit of data, the data is read and stored in the buffer. At the same time, the pointer is set to point to the buffer address where the next unit is to be stored.If it is not possible to read one unit of data, the pointer is set to store the next unit without writing data to the buffer. 1. A file copying method characterized in that the contents of the buffer are written to a second storage medium one unit at a time when the buffer becomes full.