JPH0562355A - Method for arranging volume label of magnetic disk - Google Patents

Abstract

PURPOSE:To shorten access time by preparing many files in an address close to a volume label, and to efficiently utilize a magnetic file by doubling the file closest to the volume label. CONSTITUTION:The number of track of the magnetic disk being 2n+1 (cylinder #0-#2n), the volume label 1 is arranged in the cylinder #n that is located in the center of the effective radius. In the file 2 arranged outside the volume label 1, data are recorded in the descending order or addresses in the direction from an inner cylinder to the outer circumference, and in the file 3 arranged inside the volume label 1, the data are recorded in the ascending order of the addresses in the direction from an outer cylinder to the center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume label arranging method for a magnetic disk, and more particularly to a volume label arranging method for a magnetic disk installed in an apparatus and storing a system start-up file.

[0002]

2. Description of the Related Art The position of a volume label of a conventional magnetic disk is arranged on a cylinder at the outermost circumference of the disk. Generally, files such as system startup files, which are important for input / output efficiency for system startup, are created immediately after the volume label.

[0003]

In the above-mentioned conventional method, when there are a plurality of files necessary for the system, such as a system startup file, only one file can be placed in the vicinity of the volume label, and the second one is the second file. The file becomes farther from the volume label as it becomes the third file, and the file farther from the volume label takes longer to access.

An object of the present invention is to provide a volume label arranging method for a magnetic disk which allows a plurality of files to be placed in contact with a volume label and shortens file access time.

[0005]

According to the volume label arranging method for a magnetic disk of the present invention, the volume label is arranged in a cylinder located substantially at the center of the effective recording radius of the magnetic disk, and the cylinders outside the volume label have the above-mentioned structure. A file is created from the volume label toward the outer circumference, and a file is created from the volume label toward the center of the cylinder inside the volume label.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is an explanatory diagram of a volume label arrangement according to an embodiment of the present invention.

In this embodiment, as shown in FIG.
Volume label 1 indicates the number of tracks on the magnetic disk is 2
n + 1 (cylinders # 0 to # 2n) is arranged in the cylinder #n located at the center of its effective radius. File 2 is arranged outside the address having a smaller volume label than volume label 1, and file 3 is arranged inside the address having a larger volume than volume label 1. Data is recorded toward file 3, and in file 3, cylinder #
Data is recorded from (n + 1) in ascending order of addresses toward the cylinder on the center side.

The files 2 and 3 are generally files such as system start-up files for which input / output efficiency is important, and the other files are appropriately created in an empty area on the magnetic disk outside the file 2 or inside the file 3. To be done.

FIG. 2 is a flow chart showing the procedure for creating the above arrangement.

First, the size such as the capacity and number of files to be stored on the magnetic disk is assumed (step 11), and the capacity of the volume label for file management on the magnetic disk is calculated based on this (step 12). .. next,
A cylinder for arranging a volume label is created by creating a layout of the entire magnetic disk (step 13), and the magnetic disk is initialized to create a volume label (step 14). At this time, the magnetic disk device sequentially moves the magnetic head from the cylinder # 0 to perform the prescribed formatting process, and when the magnetic head is positioned at the designated cylinder, creates a volume label, which is used as the initial position of the magnetic head thereafter. Remember. Finally, files are created in order from the place near the volume label (step 1
5).

When using a magnetic disk, the volume label is first accessed, the position of the target file is detected, and then the file is accessed. In the arrangement of the volume label of FIG. 1, the distance that the magnetic head moves when accessing the file is about half the average on the conventional magnetic disk in which the volume label is arranged in the cylinder # 0. Further, since the recording direction is reversed between the file outside the volume label and the file inside the volume label, the access time can be minimized.

In the above description, the volume label is created on one track of the cylinder #n, but the same applies to the case where the track extends over a plurality of tracks. Further, although the volume label is arranged on the center track with the number of tracks being an odd number, it may be at the center of the effective recording radius regardless of the number of tracks.

[0014]

As described above, according to the volume label placement method for a magnetic disk of the present invention, a file can be created at an address closer to the volume label, so that the file access time can be shortened and the file can be placed near the volume label. Since the number of files created can be doubled, there is an effect that the magnetic disk can be used efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an arrangement of volume labels according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure for realizing the arrangement of FIG.

[Explanation of symbols]

 1 volume label 2-3 files

Claims (1)

[Claims] 1. A volume label is arranged in a cylinder located approximately in the center of an effective recording radius of a magnetic disk, and a file is created in a cylinder outside the volume label from the volume label toward the outer peripheral direction. A volume label arranging method for a magnetic disk, wherein a file is created in the inner cylinder from the volume label toward the center.