JPH0574078A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To minimize the vibration of a magnetic head immediately after positioning the magnetic head by selecting an optimum speed reference signal from among plural speed reference signals prepared preliminarily at the time of starting a device and to write/read a data normally even when the variation of the torque of a magnetic head moving motor is large. CONSTITUTION:A difference data 10 to be a difference between the stopping position of the magnetic head and the present position of the magnetic head is inputted to memories 2-1-2-n. After a micro processor 1 selects the memory 2-1 to the memory 2-n in this order successively and respective magnetic heads are positioned, a magnetic head positional signal 40 is stored in respective memories. Then, the memory of the minimum value of the magnetic head position signal is selected and fixed thereafter and the start of the device is ended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to positioning of a magnetic head.

[0002]

2. Description of the Related Art Conventionally, in this type of magnetic disk device, there is a memory in which data of a speed reference signal is written for movement and positioning of a magnetic head. Specifies the moving speed of the magnetic head.

The magnetic head moving operation of the conventional apparatus will be described with reference to FIG. When the magnetic head is moved, the difference data 10 which is the difference between the target magnetic head stop position and the current position of the magnetic head is written as the speed reference signal data for determining the speed of the magnetic head. It is input to the existing memory 3. The memory 3 outputs the data of the speed reference signal 50 corresponding to the input difference data 10 to the magnetic head positioning circuit 8. The magnetic head positioning circuit 8 moves the magnetic head at the moving speed of the magnetic head defined by the speed reference signal 50.

Since vibration occurs in the magnetic head immediately after the positioning of the magnetic head, this vibration is stopped and a certain time (hereinafter referred to as settling time) is allowed until data can be written to the magnetic disk medium through the magnetic head.
Will be needed. The vibration amount of the magnetic head immediately after positioning is greatly affected by variations in the speed reference signal and the torque of the motor, etc., but in the conventional disk, one optimal speed reference signal 50 is used.

[0005]

In the conventional magnetic disk device, when the vibration of the magnetic head immediately after the magnetic head is positioned is larger than expected due to the variation of the torque of the magnetic head moving motor, it cannot be dealt with within the settling time. There is. In such a case, there is a problem that data is written to the magnetic disk medium while the magnetic head is vibrating, and the data cannot be read thereafter.

An object of the present invention is to provide a plurality of memories in which data of a speed reference signal for determining a moving speed of a magnetic head is written, and to select a memory in which optimum speed reference signal data is written by a digital magnetic head position signal. The present invention provides a magnetic disk device for performing the above.

[0007]

SUMMARY OF THE INVENTION A magnetic disk device according to the present invention includes a plurality of memories in which data of speed reference signals for determining the moving speed of a magnetic head are written, and a magnetic head position signal which is an analog signal and a digital signal. And an analog / digital conversion circuit for converting into a digital signal, and a microprocessor for selecting the memory in which optimum speed reference signal data is written from the plurality of memories according to the magnetic head position signal converted into a digital signal.

[0008]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
Is a flowchart of this embodiment. The magnetic head of the present invention is positioned by a plurality of memories 2-1 and 2-2 in which data of a speed reference signal that determines the speed of the magnetic head is written.
-2 to 2 to n, an A / D converter 5 for converting an analog magnetic head position signal 30 into a digital signal,
The microprocessor 1 is configured to select the memories 2-1 to 2-n in which the data of the optimum speed reference signal is written by the magnetic head position signal 40 converted from the analog signal to the digital signal.

In FIG. 2, the magnetic disk device performs a magnetic head moving operation when the device is activated (S1). First, the microprocessor 1 selects the memory 2-1 (S
2). After the moving operation of the magnetic head is completed (S3) and the magnetic head is positioned (S4), the analog magnetic head position signal 30 output from the head positioning circuit 6 is
It is input to the A / D converter 5 (S5) and converted into a digital magnetic head position signal 40. The microprocessor 1 reads and stores the digital magnetic head position signal 40 (S6).

Next, the microprocessor 1 is connected to the memory 2
-2 is selected, the same operation as above is performed, and the data of the digital magnetic head position signal 40 is stored. In this way, the memory 2-n is selected (S7) and the above operation is performed, and the digital magnetic head position signal 40 at the time of selecting each memory is stored.

The microprocessor 1 selects, for example, the memory 2-1 in which the digital magnetic head signal 40 has the minimum value, and thereafter fixes (S8) and terminates the apparatus starting operation (S).
9). As a result, the memory 2-1 in which the optimum speed reference signal is written is selected, and the vibration of the magnetic head immediately after the magnetic head positioning is reduced.

[0012]

As described above, according to the present invention, a plurality of memories in which the data of the speed reference signal for determining the speed of the magnetic head are written, and the A / D for converting the analog magnetic head position signal into a digital signal. By including a converter and a microprocessor that selects a memory in which data of an optimum speed reference signal is written by a magnetic head position signal converted from an analog signal to a digital signal, vibration of the magnetic head immediately after magnetic head positioning is adjusted. It is possible to reduce the size, and it is possible to read and write data normally even when there is a large variation in the torque of the magnetic head moving motor.

[Brief description of drawings]

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

FIG. 2 is a flowchart of this embodiment.

FIG. 3 is a block diagram of a conventional magnetic head position circuit.

[Explanation of symbols]

 1 Microprocessor 2-1 to 2-n, 4 Memory 5 A / D Converter 6, 8 Head Positioning Circuit

Claims (1)

[Claims] 1. A plurality of memories in which data of a speed reference signal for determining a moving speed of a magnetic head are written, an analog / digital conversion circuit for converting a magnetic head position signal which is an analog signal into a digital signal, and a digital signal. A magnetic disk drive comprising a microprocessor for selecting the memory in which optimum speed reference signal data is written from among a plurality of the memories according to the magnetic head position signal converted into.