JPS5963059A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To shorten a warming-up time by constituting a circuit for executing a seeking operation in the course of warming-up. CONSTITUTION:After a device starts, the first seek is executed by the first seeking circuit 1, positioning is executed to an (0) cylinder, and simultaneously, an output (a) is set to H. Subsequently, a timing circuit 2 starts its operation, an output (d) of an OR gate 7 becomes H, a bus switching circuit 4 selects a bus 13 as an input, and a seek instruction circuit 5 starts to operate. A seeking circuit 3 repeats a seeking operation while the output (d) of the OR gate is H. When an output (c) of a D type F/F 6 becomes L and the output (d) of the OR gate becomes L by the first positioning after an output (b) of the timing circuit becomes L, an output (f) of an AND gate 9 becomes H, an output (e) of the seeking circuit 3 becomes H by an output (g) of a monostable multivibrator circuit 10, therefore, an output (h) of a D type F/F 11 becomes H, a regular access can be executed, and warming-up is ended.

Description

[Detailed Description of the Invention] The present invention requires less warm-up time.
The present invention relates to a disk device.

In recent years, the cost and track density of magnetic disk drives have increased as they have become less popular.

Due to the high density of tracks, hot off-track becomes a problem.This temperature off-track is caused by the temperature rise in the vicinity of the disk plate and head after starting up the magnetic disk drive W, causing the disk phase, head, and parts in their vicinity to become thermally damaged. This occurs because the data head undergoes thermal expansion until it reaches the flat state, causing a positional shift between the data head and the servo head for positioning the data head. This muddy off-track allows for accurate data recording until thermal equilibrium is achieved.

Unable to reproduce, unreliable and unable to use magnetic Dinuk devices. Therefore, in order to improve the reliability of magnetic disk drives, the disk plate is rotated without recording or reproducing data as a warm-up until the magnetic disk device reaches a thermal equilibrium state, and each component is brought into a thermal equilibrium state. I'm waiting until Since warming-up involves only the rotation of the disk plate, it takes a long time to reach a thermal equilibrium state, and the disadvantage is that the magnetic disk device cannot be used immediately after starting up.

An object of the present invention is to perform a continuous seek operation in which the disk root, head, and nearby parts reach a thermal equilibrium state by performing a continuous seek operation by simply rotating the disk plate. Due to air friction heat and voice coil heat generation, the rise in mixed use is flattened and thermal equilibrium is reached. P
It is an object of the present invention to provide a magnetic tisf device that can shorten the warm-up time, and therefore can determine the warm-up time without compromising the reliability of the magnetic tisf device.

The magnetic tissue device of the present invention is characterized in that the magnetic tissue device requires a warming-up time for the device activation piece, and includes a circuit that performs a continuous seek operation during the warming-up time.

Next, embodiments of the present invention will be described with reference to the drawings.

I will clarify. Figure 1 shows an embodiment of the present invention, and Figure 2 shows the time chart of Figure 1. In this embodiment, the warm-up time can be determined by continuously repeating random seek operations during the warm-up time after performing the first seek after starting the magnetic disk device.

Referring to FIG. 1, in this embodiment, the first seek circuit 1.controls the first seek and outputs the first seek end signal a. A timer circuit 2 operated by the first seek end signal, a seek circuit 1!53 that controls direct seek and rezero seek, and a bus switching circuit that outputs the 2° bus 13 to the selected bus 14 based on the output d of the OR gate 7. 4. Seek command circuit that operates by OR gate d and generates a seek command 5. D type F/F
6, OR gate 7, inverter 8, AND gate 9,
Mono multi circuit 10, D type F'/Fil, bus 12
, bus 13, and bus 14. Also, Figure 2 is the same as Figure 1.
In the time chart shown in the figure, output a of the first seek circuit becomes IH level after the end of first seek, output of the timer circuit is output, c r OR dirt output d of the D type F/F, seek circuit becomes 1H level while the head is positioning. Output e, AND gate output f, mono multi-circuit output g,
The time chart of the warming-up end signal is shown in the output of the D-type F/Fil.

Next, we will explain the magnetic (operation from the start of the disk drive until the end of warming up).The fast seek circuit 1 of the magnetic disk drive start-up edge performs a fast seek, and at the same time, the first seek circuit outputs a. When the output a of the first seek circuit reaches 1J level, the timer circuit 2 starts operating and the output becomes sHw level.

The output "bl becomes w)Is level"
When the output d of the gate 17 becomes an IH level, the bus switching circuit 4 selects the bus 13 as its input, and the seek command circuit 5 starts operating. The seek command circuit outputs the command to the bus 13, and the bus switching circuit 4. It is sent to the seek circuit 3 via the bus 14. Seek circuit 3 receives the seek command,
The seek operation is started and the seek operation is repeated while the OR gate output d is at the lHl level. The timer circuit operates and the warm-up time 'l timer output becomes 1L1, but since the output C of the D type F/F' 6 is at the l Hw level, OR, the gate output d becomes 1 at the Hl level. By the first positioning after the timer circuit output reaches 1L level, the output of D type F/F6 becomes C or 'L level, and OR gate output d becomes lLl.OR gate output d becomes 1L level. Then, the bus switching circuit 4 selects the bus 12 as its input, and the operation of the seek command circuit 5 stops. At this time, AND gate 9
The output f becomes 1H level, and the monomulti circuit 10 is operated to generate a pulse at the output H. The seek circuit performs a re-zero seek operation upon the rise of the pulse of the output g of the monomulti circuit 10, thereby increasing the position of the O cylinder.

At the same time as positioning to the 0 cylinder, the output e is l l
(The output of D type F/■-11 is “
It becomes H” level.

When the output level of the D-type F/Fil reaches the wH level, normal access becomes possible and warming-up is completed.

As described above, the present invention makes it possible to create a highly reliable magnetic disk device with a short warm-up time by configuring a circuit that performs a seek operation during warm-up.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG.
This is a time chart showing one of the works in Figure 1. 0 1...First seek circuit, 2...--
・Timer circuit, 3... Seek circuit, 4...
...Bus switching circuit, 5...--Seek command circuit,
6...1) Type F/F. 7...OR gate, 8...Inverter, 9...AND gate, 10...Mono multi circuit, 11...-D type F/F ,12,1
3.14 ... bus, a ... first seek circuit 1 output, b ... timer output, C ...
・・・・・・D type F/F6 output, d・・・・・・OR
Gate output, e... Seek circuit output, f...
... AND cable force % g ... Mono multi-circuit output, h ... D type F/F11 output (warming-up end signal).

Claims (1)

[Claims] Device start-up stage: A magnetic disk device specially designed to have a circuit that performs a continuous seek operation during the warming-up time in a jjb%1 tinuku device that requires R and Bi at the time of warming-up.