JPH02267779A - System for controlling magnetic disk device - Google Patents

Abstract

PURPOSE:To shorten a seek action time occupied in the read/write action of a magnetic disk device by seek-operating a magnetic head in the intermediate position in a seek range on a magnetic disk in an unoccupied time after a write/read action. CONSTITUTION:After the seek action to move the magnetic head to a position to store the write/read data of a magnetic disk 4 is executed, the data are transmitted and received between the disk 4 and a host computer 1 through a magnetic disk controller 3. Thereafter, when the unoccupied time, in which the execution instruction of the write/read action is not executed from the computer 1, is detected by the magnetic disk controller 3, the seek action to move the magnetic head to the intermediate position of the seek range of the magnetic head of the disk 4 from the position of the magnetic head at such a time is autonomically instructed from the controller 3 to the disk 4. By the seek action, the moving quantity and moving time of the magnetic head of the disk 4 can be shortened.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a control method for a magnetic disk device.

[Conventional technology]

Conventionally, a magnetic disk device is a storage device that performs magnetic storage in concentric storage positions (tracks) on a magnetic disk, and selects three tracks by moving a magnetic head in the radial direction.

[Problem to be solved by the invention]

In the conventional magnetic disk device described above, the control operation (hereinafter referred to as seek operation) for selecting the storage position (track) of the magnetic disk is accompanied by mechanical positioning control, and the read and write of the stored contents (data) is performed. It has the disadvantage that it requires a lot of time compared to the time required for this method.

[Means to solve the problem]

The magnetic disk device of the present invention includes an empty time detecting means for detecting an empty time after completion of write and read operations of the magnetic disk device, and a seek range on the magnetic disk disk from the position of the magnetic head after the detection of the empty time. and magnetic head setting means for causing the magnetic head to perform a seek operation at a position intermediate between the two.

〔Example〕

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

The magnetic disk unit W2 is connected to a host computer 1 which executes and controls data transmission and reception with the magnetic disk unit W2. The inside of the magnetic disk device 2 includes a magnetic disk controller 3 that controls data transmission and reception with the host computer 1, and a magnetic disk 4.

First, read/write operations of a general magnetic disk device will be explained. When the host computer 1 instructs the magnetic disk device 2 to execute a write operation, the magnetic disk controller 3 performs a seek operation to move the magnetic head to a storage position for write I data on the magnetic disk 4.
After the write data is executed via the host computer 1 , the write data is transmitted from the host computer 1 and stored on the magnetic disk 4 via the magnetic disk controller 3 . Next, in the read operation of the magnetic disk device, when the host computer 1 instructs the magnetic disk device W2 to execute the read operation, the magnetic disk controller performs a seek operation to move the magnetic head to the storage position of the read data on the magnetic disk 4. 3, read data from the magnetic disk 4 is transmitted to the host computer 1 via the magnetic disk controller 3.

Next, the difference between the read/write operation of the above-mentioned general magnetic disk device and the read/write operation of the disk of the present invention will be explained. In the read/write operation of the disk of the present invention, in response to an instruction to execute the write/read operation from the host computer 1, after performing a seek operation to move the magnetic head to a storage position for write/read data on the magnetic disk 4, Data is transmitted and received between the magnetic disk 4 and the host computer 1 via the controller 3. Thereafter, when the magnetic disk controller 3 detects an idle time in which there is no instruction to execute a write/read operation from the host computer 1, the magnetic disk controller 3 autonomously moves the magnetic disk 4 from the position of the magnetic head at that time. Instructs a seek operation to move the magnetic head to a position in the middle of the seek range of the magnetic head.

With this seek operation, when a write/read operation instruction is received from the host computer 1 next time, the amount of movement and time of the magnetic head of the magnetic disk 4 will be increased by up to 1
This can be shortened to /2.

〔Effect of the invention〕

As explained above, the present invention causes a magnetic disk device to autonomously perform a seek operation of the magnetic head from the current magnetic head position to a position in the middle of the seek range on the magnetic disk during idle time after a write/read operation. By having the magnetic head setting means, there is an effect that the seek operation time occupied in the read/write operation of the magnetic disk device can be reduced to a maximum of 1/2.

disk.

Claims (1)

[Claims] Empty time detection means for detecting an idle time after completion of write and read operations of a magnetic disk device, and a magnetic head positioned at an intermediate position of a seek range on a magnetic disk disk from the position of the magnetic head after the detection of the idle time. 1. A control method for a magnetic disk device, comprising: magnetic head setting means for performing a seek operation.