JPH01194168A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To change the address of each magnetic head by providing an address converting circuit having a function to change a magnetic head selecting command inputted from a host device and convert it into another magnetic head selecting command. CONSTITUTION:An address converting circuit 2 is added between a magnetic head address register 1 and a magnetic head selecting circuit 3. Since the address converting circuit 2 has the function to convert the designated magnetic head from the host device into another address, the magnetic head address (magnetic head selecting command) is converted into another magnetic head address (another magnetic head selecting command) based on a command from the outside if necessary and it is inputted to the magnetic head selecting circuit 3. Thus, the magnetic head selecting circuit 3 can select the magnetic head in accordance with the converted address.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic head selection mechanism.

[Conventional technology]

Conventionally, in this type of magnetic disk drive, address settings for selecting a magnetic head have been fixed by circuit connections within the magnetic disk drive.

[Problem to be solved by the invention]

As mentioned above, the magnetic head addresses in conventional magnetic disk drives are fixedly determined, and the addresses of individual magnetic heads cannot be changed.

An object of the present invention is to provide a magnetic disk device that solves the problem n.

[Means to solve the problem]

In order to solve the above problems, in a magnetic disk device equipped with a plurality of magnetic heads according to the present invention, an address having a function of changing a magnetic head selection command input from a host device and converting it into another magnetic head selection command is provided. It has a conversion circuit.

〔Example〕

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

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

In the figure, reference numeral 3 denotes a magnetic head selection circuit that selects a specific magnetic head instructed by a host/device from among a plurality of magnetic heads (not shown).

Reference numeral 1 denotes a magnetic head address register that holds a specified magnetic head address from a host device, and 2 an address conversion circuit that converts the value held in the magnetic head address register 1 to another address as required. Since the address conversion circuit 2 has a function of converting a specified magnetic head address from the host device into another address, the address conversion circuit 2 converts the magnetic head address (magnetic head selection command) from the host device into Based on an external command, it is converted into another magnetic head address (another magnetic head selection command) as necessary, and is input to the magnetic head selection circuit 3.

In the embodiment, a magnetic head address register 1 holds a magnetic head address designated by a host device via an interface. An address conversion circuit 2 converts the value held in the magnetic head address register 1 to another address as necessary. The magnetic head selection circuit 3 selects a magnetic head according to the converted address.

Note that the address conversion circuit 2 in the present invention is a ROM (
Read ONLY Memory) or a switch matrix.

〔Effect of the invention〕

As explained above, the present invention adds an address conversion circuit between the magnetic head address register and the magnetic head selection circuit, so that the magnetic head address specified by the host device via the interface and the physical position of the magnetic head can be changed. Magnetic head addresses can be separated. If a specific recording track should not have a media defect due to system usage conditions, the present invention converts the specific track into a track without a media defect, thereby making it usable as a system.

Previously, if there was a media defect on a particular track, the magnetic disk medium had to be replaced.
According to the present invention, the objective can be easily achieved simply by changing the conversion rules of the address conversion circuit.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Magnetic head address register

Claims (1)

[Claims] 1. A magnetic disk device equipped with a plurality of magnetic heads, characterized in that it has an address conversion circuit that has the function of changing a magnetic head selection command input from a host device and converting it into another magnetic head selection command. disk device.