JP2624705B2 - Magnetic disk drive - Google Patents

Description

Description: Object of the Invention (Field of Industrial Application) The present invention relates to a magnetic disk drive, and more particularly to an improvement in a mechanism for protecting a track of a magnetic recording medium.

(Prior Art) In recent years, in order to enable high-density recording on a magnetic disk device, for example, a perpendicular magnetic recording method of perpendicularly magnetizing a recording surface of a magnetic recording medium using barium, ferrite, or the like has been adopted. It became so.

On the other hand, durability is strictly required for a magnetic recording medium in order to enable high-density recording to be repeated many times.

However, in the case of a conventional magnetic disk drive,
At the end of the recording / reproducing operation, the magnetic head is kept stopped at the position of the last track for recording / reproducing, so that the frequency difference between the frequently used track and the less frequently used track becomes significant.

(Problems to be Solved by the Invention) As described above, according to the conventional magnetic disk device, the magnetic head is always stopped at the position of the last track at the end of the recording / reproducing operation. And the frequency difference between the track and the track having a lower frequency is remarkable. As a result, the durability of frequently used tracks is significantly degraded, and even if other infrequently used tracks are sound, the entire magnetic recording medium has the disadvantage of impairing its function as a high-density recording medium. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make the use frequency distribution between tracks in a magnetic recording medium as uniform as possible.

(Structure of the Invention) (Means for Solving the Problems) In the magnetic disk device of the present invention, the recording and reproduction control unit writes and writes information to each track of the magnetic recording medium via the magnetic head in accordance with an instruction from the CPU. Recording / reproduction control means for reading information written on each track of the magnetic recording medium; random oscillation means for outputting a signal for moving the magnetic head to an arbitrary position after recording / reproduction by the recording / reproduction control means is completed; Command output means for outputting a command from the CPU to the recording / reproduction control unit while the magnetic head is moving to an arbitrary position in response to a signal from the random oscillation means; and a command output from the command output means. When the magnetic head is positioned by the search command, the magnetic head is arbitrarily moved and the difference between the stopped position track and the position-designated track is determined. When the command output from the command output means is a read / write command, the magnetic head returns to the track at the end of recording / reproduction, and writes information on the magnetic recording medium or performs magnetic recording. Movement control means for reading information from the medium,
Is provided.

(Operation) With such a configuration, after the recording / reproducing on the magnetic recording medium is completed, while the magnetic head is moving to an arbitrary position in response to a signal for moving the magnetic head to an arbitrary position, the CP
If the command from U is a search command (SEEK command) to position the magnetic head, the magnetic head is arbitrarily moved and moved by the difference between the stopped position track and the position-designated track. In the case of a read / write command, the magnetic head returns to the track where recording / reproduction has been completed, and writes information to the magnetic recording medium or reads information from the magnetic recording medium. Therefore, it is possible to solve the problem that the durability deterioration of the magnetic recording medium is significantly different for each track.

(Embodiment) FIG. 1 is a block diagram schematically showing the configuration of an embodiment of a magnetic disk drive to which the present invention is applied.

The magnetic disk drive of this embodiment basically includes a CPU 1 which is a control center of the whole system, and a floppy disk controller (FDC) 2 which receives a command from the CPU 1 and controls a floppy disk drive (FDD) 3. Further, a random oscillator 4 for generating a random step pulse is provided inside the FDC 2.

The FDD 3 is written and read by the control circuit 7 which receives a signal from the FDC 2 in order to write information to the magnetic recording medium 6 via the magnetic head 5 and to read information written in the magnetic recording medium 6. A drive system circuit 9 for moving a carriage 11 for moving the magnetic head 5, and a motor control circuit 10 for driving a spindle motor 12 for rotating the magnetic recording medium 6. Prepare.

Next, the operation will be described. First, when an instruction is given from the CPU 1 to the FDC 2, the FDD 3 performs recording / reproduction according to the instruction. After completing the command, a random step pulse is given from the random oscillator 3 in the FDC 2 to the control circuit 7 in the FDD 3, and the magnetic head 5 mounted on the carriage 11 is moved to an arbitrary track.

Further, when an instruction is given from the CPU 1 to the FDC 2 while the magnetic head is moving to an arbitrary position in response to the output of the random step pulse by the FDC 2, the state of the FDC 2 is in a state of being busy with Busy. Therefore, the FDD 3 executes the instruction of the CPU 1 after arbitrarily moving the magnetic head 5 by a random step pulse from the FDC 2. If the instruction is for positioning the magnetic head 5 in the SEEK instruction, the magnetic head 5
Moves by the difference between the position track arbitrarily moved and stopped and the track designated for positioning, and in the case of a read / write command, returns to the track at the end of recording / reproduction and returns to the magnetic recording medium 6. , Or read information from the magnetic recording medium 6.

Therefore, according to this embodiment, it is possible to make the frequency of use for each track of the magnetic recording medium 6 as constant as possible.

〔The invention's effect〕

As described above, according to the magnetic disk drive to which the present invention is applied, when recording / reproduction ends, the magnetic head moves to an arbitrary position in response to a signal for moving the magnetic head to an arbitrary position. When the command from the CPU is a search command to position the magnetic head or when the command is a read / write command, the magnetic head is moved to an arbitrary position and stopped, so that each track of the magnetic recording medium is stopped. Of the magnetic recording medium can be avoided as much as possible, and deterioration of the durability of the entire magnetic recording medium can be avoided as much as possible.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an embodiment of a magnetic disk drive to which the present invention is applied. 1 ... CPU, 2 ... Floppy disk controller (F
DC), 3 ... Floppy disk drive (FDD), 4
... random oscillator, 5 ... magnetic head, 6 ... magnetic recording medium

Claims (1)

(57) [Claims] A recording / reproducing control means for writing information to each track of a magnetic recording medium and reading out information written to each track of the magnetic recording medium via a magnetic head by a recording / reproducing control unit according to a command from a CPU; After the recording / reproduction by the recording / reproduction control means is completed, a random oscillation means for outputting a signal for moving the magnetic head to an arbitrary position; and the magnetic head being moved to an arbitrary position in response to a signal from the random oscillation means. Command moving means for outputting a command from the CPU to the recording / reproducing control unit while moving, and the magnetic head is optional when the command output from the command outputting means is a search command for positioning the magnetic head. Is moved by an amount corresponding to the difference between the position track moved and stopped and the track designated for positioning, and the command output from the command output means is read / read. The magnetic head in the case of site command returns to the track when the finished recording and reproducing,
A movement control unit for writing information on the magnetic recording medium or reading information from the magnetic recording medium.