JPH03266040A - File management method of secondary storage device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is particularly useful when creating a file on a fixed sector length secondary storage medium by making it possible to span the storage space of blocks. The present invention relates to a file management method for a secondary storage device that aims to improve media usage efficiency.

[Conventional technology]

In the conventional data recording method (Japanese Unexamined Patent Publication No. 115273/1983), when an unwritten sector is detected, it is checked whether a record can be written. If the record cannot be written, a replacement sector is used to write the record. It was a writing method.

[Problem to be solved by the invention]

When creating a file in which one block has a predetermined number of sectors on a fixed sector length secondary storage medium and the file entity is divided into a plurality of storage spaces, If the last block in the storage space lacks sectors, that block is made unused, and a new block is cut out from the beginning of the next storage space.

However, as the number of sectors constituting one block in the storage space increases, blocks cannot span the storage space, which increases the number of unused sectors and reduces the efficiency of use of the secondary storage medium. There was a problem.

An object of the present invention is to provide one block on a fixed sector length secondary storage medium with a predetermined number of sectors, and
When creating a file whose actual file is divided into multiple storage spaces, if the last block of the storage space lacks sectors, the missing sectors are cut out from the beginning of the next storage space without leaving the block unused. Therefore, it is an object of the present invention to provide a file management method for a secondary storage device that enables blocks to span storage space and improves the usage efficiency of a fixed sector length secondary storage medium.

[Means to solve the problem]

In order to achieve the above purpose, one block is composed of a predetermined number of sectors on a fixed sector length secondary storage medium, and the actual file is divided into multiple storage spaces. When creating a file, there is 1 in the storage space.
Information is written in blocks. At this time, the number of sectors required for one block is subtracted from the total number of sectors in the storage space. If there is a shortage of sectors in the final block, information is written for the number of sectors that can be written, the insufficient sectors are cut out from the beginning of the next storage space, and the remaining information is written.

[Effect]

The file management method of the fixed sector length secondary storage device of the present invention is such that one block is composed of a predetermined number of sectors on the fixed sector length secondary storage medium, and the file entity is When creating a file that is divided into multiple storage spaces, if the last block in the storage space runs out of sectors, information is written for the number of sectors that can be written, and the missing sectors are written from the beginning of the next storage space. By cutting out the block and writing the remaining information, what was conventionally used as an unused sector when information cannot be written to the final block in the storage space due to lack of sectors is effectively used, increasing medium efficiency.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is a fixed sector length secondary storage medium, 2 and 3 are storage spaces, 4 is a storage space used by other files, and 5 is a fixed sector length storage medium. 6 is a block which is a collection of data, 7 is a sector that divides the track into a predetermined length, and 8 and 9 are written across the storage space. This is a block.

Multiple storage spaces 2 in a fixed sector length secondary storage medium 1
When creating a file in which each block 6 consists of a predetermined number of sectors 7, allocate storage spaces 2 and 3 on the secondary storage medium l and create a track. Blocks 6 are sequentially written starting from the beginning of block 5. Then, an attempt is made to write the final block of storage space 2, but there is a shortage of sectors, so the block 8 is written as much as can be written to the final block of storage space 2, and the missing sector is cut out from the beginning of the next storage space 3. Write the remaining block 9.

〔Effect of the invention〕

According to the present invention, when creating a file on a fixed sector length secondary storage medium, in which one block consists of a predetermined number of sectors, and the file entity is divided into multiple storage spaces. , when the last block in the storage space lacks sectors, write information for the number of sectors that can be written without leaving the block unused, cut out the missing sectors of the final block from the beginning of the next storage space, and write the remaining sectors. By writing information, it is possible to span the storage space of blocks, and there is an effect that the usage efficiency of a fixed sector length type secondary storage medium is improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention. 1...Secondary storage medium, 2.3...Storage space, 4...Storage space used by other files, 5...
Track, 6...Block, 7...Sector, 8...Half block written as the final block of storage space, 9...Cut out the missing sectors from the beginning of the next storage space The last block written.

Claims (1)

[Claims] 1. When creating a file on a fixed sector length secondary storage medium, if one block consists of multiple sectors and the file entity is divided into multiple storage spaces, the storage space When a sector shortage occurs in the last block in the block, the sector is not left unused, but the missing sector is cut out from the beginning of the next storage space, and the storage space of the block is spanned as one block. A file management method for secondary storage devices.