JPS6145474A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To detect abnormality quickly and to improve the working efficiency of a system by reading out the data of a fixed pattern in a contact area, comparing the data with previously stored writing data, and if both the values are different from each other, informing the difference to an operator through an upper device. CONSTITUTION:When an electric power is supplied to a magnetic disc device, previously prepared data are transmitted from an initial data storing circuit 10 to a comparator 13 and the initial data are written in an HDA 8 by a writing circuit 11 through a head driving circuit 7. The data in the HDA 8 are read out by a reading circuit 12 through the circuit 7. The read-out data are compared with the already transmitted data by the comparator 13, and if both data are different from each other, the difference is informed to a processor 1 through an error informing circuit 14, a control adaptor 5 and magnetic disc control device 3. The processor 1 outputs an message to a console 2 inform the error status of the magnetic disc device 4 to the operator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head disk assembly in a magnetic disk device.
(hereinafter referred to as HDA), and particularly relates to a medium abnormality detection control method.

[Conventional technology]

Conventionally, this type of magnetic disk drive has a contact area where the head waits and a data area where data is written, but no data is written to the contact area and only written to the data area. was. For this reason, failures in the head and medium at power-on, which have a high failure rate, could not be detected early.

[Problems to be solved]

This is because normal gluing/writing operations are performed when the rotational speed of the medium becomes constant, but the head lifting operation when the power is turned on is caused by the buoyancy generated by the rotation of the medium. If this is the case, it can be easily assumed that the failure rate will be the highest at this time.

However, in the conventional disk device mentioned above, read/
Failures cannot be detected until a write operation is performed. This is a fatal flaw in a public system such as Punking Stem.

Therefore, as a method to prevent this defect, methods such as file duplication9 and testing all devices before starting the system have been adopted. However, these methods often have problems that increase costs and require maintenance personnel to be dispatched early in the morning.

[Means for solving problems]

The present invention includes a writing unit that writes a certain number of turns of data into a contact area where a head is waiting when the power is turned on to a magnetic disk device, a reading unit that immediately reads the written data, and a read unit that reads the data that has been read. A comparison unit conveys previously written data, and if the comparison results in different data, it notifies the operator via the host device, allowing early detection of device abnormalities. Moreover, the above-mentioned problems are solved by increasing the operating rate of the system.

(Example〕 An embodiment of the present invention will be described below with reference to the drawings.

Here, FIG. 1 is a block diagram showing the configuration of the present invention, and FIG.
The figure is a diagram showing a medium in the HDA in FIG. 1. In these drawings, 1 is a processing device Et, 2 is a console that functions as a man-machine interface with an operator, 3 is a magnetic disk control device, and 4 is a magnetic disk device.

This magnetic disk device 4 includes a control device adapter 5 which is an interface with the magnetic disk control device 3, a main control circuit 6 of the magnetic disk device 4, a head drive control circuit 7, f(DA8), which drives the head, and an HDA8 when the power is turned on. The initial diagnostic circuit 9, which is the core of the present invention, is an initial data storage circuit 101 that stores initial data. Writing circuit 11. Consists of a reading circuit 12 for reading written data, a conveyor 13 for comparing initial data and read data, and an error reporting circuit 14 for reporting to a host device if the comparison result is incorrect.

When the magnetic disk device 4 is powered on, the initial data storage circuit 10, which is prepared in advance, sends data to the conveyor circuit 13, and the write circuit 11 drives the head drive circuit 7, and the initial data is stored in the HDA 8. Write. Immediately after writing, H is passed through the reading circuit 12 and through the head drive circuit 7.
Read the data of DA8. The read data is sent to the conveyor circuit 13 and compared with the written data that has already been sent.

If the comparison result is correct, it is notified to the error reporting circuit 14, and is reported to the processing device el via the control device adapter 5 and the magnetic disk control device 3.

The processing device 1 outputs a message to the console 2 to inform the operator of the error state of the magnetic disk device 4.

This makes it possible to know the medium status and head status of the portion of the HDA 8 where the failure rate is highest when the stain source is turned on.

Next, FIG. 2 shows details of the contact area and data area of the HD person 8, and the head drive circuit 7 is the same as in FIG. This is a positioner circuit 15 that determines the head position.
It consists of a write selection circuit 16, a read selection circuit 17, and in addition to these, a head 18 and a medium 19. The medium 19 also has a contact area 1 that fixes the head when stopped.
Noah 20 and data area 21 for storing normal data 1
It consists of

Here, the relationship between the head 18 and the medium 19 will be explained in detail. When the power to the magnetic disk device 4 is turned off, the head 18 is at the position of the contact hole 20 of the medium 19. When the power is turned on, the medium 19 rotates, and the head 18 is lifted by the buoyancy generated by the rotation of the medium 190. The friction phenomenon between the head 18 and the medium 19 that occurs at this time causes the ball to crash and dust to adhere to the data area 21. After the head 18 is lifted up, normal data transfer is performed, but at this time the head 18 only moves between the contact area 20 and the data area 21. Therefore, the failure rate of the head 18 and medium 19 is highest when the power is turned on. This can be realized by providing an initial diagnosis circuit 9 as a means for early detection of this device abnormality.

〔Effect of the invention〕

As described above, the present invention has the effect of early detecting device abnormality and increasing the system operating rate by reading/writing a fixed pattern of data to the contact area of the medium.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is M1
FIG. 3 is a diagram showing a medium in the HDA shown in the figure. 1... Place] Ll [[2... Connor 3... Magnetic disk control device 4... Magnetic disk device 5... Control device adapter 6... Main control circuit 7... Head drive circuit 8
...HDA 9...Initial diagnosis circuit 10
...Initial data storage circuit 11...Write circuit 12...Read circuit 13
... Conveyor circuit 14 ... Error reporting circuit 1
5...Positioner circuit 16...Write selection circuit 1
7...Reading selection circuit 18...Head 19...
・Medium 20...Contact area 21...Data area

Claims (1)

[Claims] When the magnetic disk drive is powered on, a writing section writes a fixed pattern of data to the area where the head is waiting, a reading section reads the written data, and a comparison is made between the fixed pattern of data and the read data. 1. A magnetic disk device comprising: a comparison unit for performing the comparison, and means for notifying an operator via a host device that an abnormality has occurred in the device if the comparison results in different data.