JPH03238663A - Magnetic disk control device - Google Patents

Abstract

PURPOSE:To facilitate the recovery of data in a sector subjected to shock or vibration, and to prevent the breakdown of the data by checking the data being accessed when the shock is detected, and transferring a logical sector address to a substitutive sector when an error has occurred. CONSTITUTION:When a shock.vibration detection circuit 4 detects the shock 9, it generates a shock.vibration detection signal 6 one time, and besides, when it detects the vibration 10, it generates plural vibration detection signals 6. On receiving this, a magnetic disk control part 2 sends an abnormality notification signal 7 to a disk command control part 3, and the disk command control part 3 checks the breakdown of a disk medium being operating at that time by a data check circuit 14. At that time, when there is an error, the sector of a physical address is made incapable of being used at the time of write operation, and simultaneously, its logical address is set in the substitutive sector, and the data written beforehand in a disk cache memory 5 is written in it. Thus, the recovery of the data is facilitated, and the breakdown of the data of the disk is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk control device, and particularly to a magnetic disk control device that controls a magnetic disk storage device in the information processing field.

[Conventional technology]

Conventionally, in this type of magnetic disk control device, even if a disk medium is damaged, data damage can be confirmed only when the damaged sector is accessed. When this data corruption is confirmed, the logical block address is moved to an alternative sector, and control is performed so that the corrupted sector is not used from the next access.

FIG. 5 is a block diagram of a magnetic disk control device showing an example of such a conventional device.

As shown in FIG. 5, the conventional magnetic disk control device is
When accessing the magnetic disk storage device 1, the address from the logical address input terminal AIN and the control signal from the disk control signal input terminal C0NT are transmitted to the logical address signal line group A1 and the disk control signal line group C, respectively.
A disk command control unit 3 receives addresses and control signals from the disk command control unit 3 via a physical address signal line group A2 and a disk control signal line group C2, respectively. It has a magnetic disk control section 2 which receives the signal and controls the magnetic disk storage device 1 via a disk control signal line group C3. Furthermore, data signal lines .about.D3 are connected to the data input/output terminal I10 and used for reading and writing to the magnetic disk storage device 1.

In such a disk control device, when the magnetic disk storage device 1 is accessed, if the magnetic disk control section 2 detects that the data in the sector has been destroyed due to shock, vibration, etc., an abnormality is sent to the disk command control section 3. The notification signal 7 is sent out, and the logical block address is moved to an alternative sector. This prevents the damaged sector from being used from the next access.

[Problem to be solved by the invention]

The above-described conventional magnetic disk control device has the disadvantage that damage to sectors due to vibration or impact is overlooked and left unattended at the time of damage, so there is a high possibility that the damaged data cannot be recovered.

An object of the present invention is to provide a disk control device that can easily restore data in a sector and prevent data destruction caused by such shocks and vibrations.

[Means for Solving the Problems] A magnetic disk control device of the present invention levitates a head using air flow generated by the rotation of a disk medium of a magnetic disk storage device, and transfers data onto the disk medium while maintaining a constant interval. A control device for the magnetic disk storage device that writes or reads data includes a shock/vibration detection circuit that generates a shock/vibration detection signal when a sudden shock or vibration is detected, and a shock/vibration detection circuit that receives the shock/vibration detection signal. It has a function of checking for an abnormality in the sector data of the disk medium currently being accessed when the disk medium is accessed, a function of generating an abnormality notification signal when an abnormality exists in the sector data, and a function of directly controlling the magnetic disk storage device. and a magnetic disk control unit that stops the disk medium when receiving continuous shock/vibration detection signals, and a disk cache memory that is connected to the magnetic disk control unit via a data signal line group and temporarily stores write data. and a function to make the sector of the disk medium in which the abnormality has occurred unusable when the abnormality notification signal is received, and to assign the logical address of the sector in which the abnormality has occurred to an alternative sector, and to prevent data corruption in the sector from being written. The disk command control unit has a function of writing data in the damaged sector from the disk cache memory to the alternative sector during operation, and notifying an error to the host device when the sector data is read. Ru.

〔Example〕

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

FIG. 1 is a block diagram of a magnetic disk control device showing a first embodiment of the present invention.

As shown in FIG. 1, in this embodiment, a magnetic disk storage device 1 includes a data signal line group and a disk control signal line group C.
The magnetic disk controller 2 is connected to the magnetic disk controller 2 via the magnetic disk controller 3, and the impact/vibration detection signal 6 is sent to the magnetic disk controller 2 when the impact/vibration is detected on the disk medium of the magnetic disk storage device 1. Shock/vibration detection circuit 4
, logical address signal line group A1 . Data signal line group D1
and a disk command control section 3 which is connected via the data control signal line group C1 and receives an abnormality notification signal from the magnetic disk control section 2, and this disk command control section 3.
The disk cache memory 5 receives a memory address signal 8 to read temporarily stored data.

Moreover, the magnetic disk control unit 2 and the disk command control unit 3 are connected to the physical address signal line group A, the data signal line group D2, the disk control signal line group C2, and the abnormality notification signal 7.
It is connected to the signal line that transmits and receives.

FIG. 2 is a waveform diagram of the shock/vibration detection signal during shock and vibration in FIG. 1.

As shown in FIG. 2, when a shock 9 or vibration 1o is applied as an external vibration to the magnetic disk storage device 1, the shock/vibration detection circuit 4 outputs a single or continuous shock/vibration detection signal 6 to the magnetic disk controller 2. sent to.

FIG. 3 is a block diagram of the disk command control section shown in FIG. 1.

As shown in FIG. 3, the Kagaru disk command control unit 3
is a command that is connected to the address conversion circuit 11 connected to the logical address signal line group A1 and the physical address signal line group A2, and the disk control signal line group C1, and sends out the address conversion control signal 16 when it receives the abnormality notification signal 7. Checks the data from the control circuit 12, the command generation circuit 13 which sends a command to control the disk via the disk control signal line group c2 based on the command control signal 19 from the command control circuit 12, and the data signal line group D2. and a data check circuit 14 that sends an error notification signal 18 to the command control circuit 12 in the event of an error; 5 and a cache controller 15 that sends out a memory address signal 8.

Next, the circuit operation of the above-described magnetic disk control device will be explained with reference to FIGS. 1 to 3.

First, the disk command control unit 3 converts a logical address and a physical address based on the logical address input from the logical address input terminal AIN and the disk control signal input from the disk control signal input terminal C0NT, and converts the logical address to the physical address. control.

Here, the collision/vibration detection circuit 4 detects a sudden large impact 9.
When detecting , a shock/vibration detection signal 6 is generated once, and when a vibration (continuous shock) 10 is detected, a plurality of vibration detection signals 6 are generated. The magnetic disk control section 2 that received this one vibration detection signal 6 is operated by the disk command control section 3.
The abnormality notification signal 7 is sent to. Upon receiving this abnormality notification signal 7, the disk command control section 3 performs a read operation on the currently operating address, and the data check circuit 14 checks for damage to the disk medium. At this time, if an error exists, during a write operation, the address conversion circuit 11 makes the sector of the currently used physical address unusable, sets the logical address in the alternative sector, and transfers the sector to the newly set sector. On the other hand, if an error exists, during a read operation, the error is sent from the command control circuit 12 to the upper level (not shown) via the disk control signal line group C1. Notify the device.

Next, when the shock/vibration detection circuit 4 detects vibration, a plurality of shock/vibration detection signals 6 are sent from the shock/vibration detection circuit 4 to the magnetic disk control device 2 . This detection signal 6
Upon receiving the error notification signal 7, the magnetic disk control unit 2 stops the disk operation in the magnetic disk storage device 1, and issues an abnormality notification signal 7.
The disk cache memory 5 does not accept operations from the disk command control unit 3 by sending
is effective for reducing the frequency of access to disk media.

In short, according to the first embodiment described above, the shock/vibration detection circuit 4 is provided to detect damage to the medium due to contact between the disk medium and the head, which is the biggest cause of damage to the disk medium. When an error is detected, the data being accessed at that time is checked, and if an error has occurred, the sector is made unusable and the logical sector address is moved to an alternative sector. At this time, if it is a write operation, data is written from the cache memory 5 that stores the write data, and if it is a read operation,
The host device is notified of the occurrence of an error. In addition, when continuous impact vibrations are detected, the operation of the disk medium is stopped to prevent damage to the disk medium as much as possible, and even if the disk medium is damaged, it is detected as soon as it is damaged. I'm trying to make it possible.

FIG. 4 is a block diagram of a magnetic disk control device showing a second embodiment of the present invention.

As shown in FIG. 4, this embodiment shows a disk system having a plurality of magnetic disk storage devices. That is, by connecting the buffer memory 20 to each of the plurality of data signal line groups D3 connecting the plurality of magnetic disk control units 2 and the plurality of magnetic disk storage devices 1, and storing the data to be written to the disk medium in advance, It is possible to prepare for rewriting associated with the generation of the shock/vibration detection signal 6.

Although the disk command control section 3 is larger in terms of circuitry, the other basic configuration and operation of the magnetic disk control device are the same as those of the first embodiment described above, so a description thereof will be omitted.

〔Effect of the invention〕

As explained above, the magnetic disk control device of the present invention is provided with a shock/vibration detection circuit, and when a single shock/vibration detection signal from this detection circuit is detected, it is determined to be a shock, and when a continuous shock/vibration detection signal is detected, it is determined to be a shock. It is determined that vibration is occurring when a shock/vibration detection signal is detected. Therefore, in the case of the former impact, data damage on the disk due to this impact will be detected and
If it is a write operation, it will write repair data to an alternative sector, and if it is a read operation, it will notify you of the corruption of this sector, but if it receives vibration from the latter, it will stop the disk operation, and if the disk is damaged, it will be stopped. By detecting this, it is possible to not only easily restore the data, but also to prevent damage to the data on the disk.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic disk control device showing a first embodiment of the present invention, FIG. 2 is a waveform diagram of shock/vibration detection signals during shock and vibration in FIG. 1, and FIG. 1 is a block diagram of a disk command control unit, FIG. 4 is a block diagram of a magnetic disk control device showing a second embodiment of the present invention, and FIG. 5 is a block diagram of a magnetic disk control device showing a conventional example. It is. DESCRIPTION OF SYMBOLS 1...Magnetic disk storage device, 2...Magnetic disk control unit, 3...Disk command control unit, 4...Shock/vibration detection circuit, 5...Disk cache memory, 6...Impact・Vibration detection signal, 7... Abnormality notification signal, 8... Memory address signal, 9... Shock wave, 10
...Vibration wave, 11...Address conversion circuit, 12...
・Command control circuit, 13... Command generation circuit, 1
4... Data check circuit, 15... Cache controller, 16... Address conversion control signal, 17.
...Cache controller control signal, 18...Error notification signal, 19...Command control signal, 20...
Buffer memory, Ilo...data input/output terminal, AI
N...Logical address input terminal, C0NT...Disk control signal input terminal, D, -D,...Data signal line group, AI...Logical address signal line group, A2...Physical address signal line Group, 01 to C3...Disk control signal line group. ' was buried by Susumu Uchihara, a patent attorney, Figure 1, Figure 3.

Claims (1)

[Claims] In a control device for a magnetic disk storage device that writes or reads data to or from the disk medium while keeping the head in the air by air flow generated by the rotation of the disk medium of the magnetic disk storage device at a constant interval, a shock/vibration detection circuit that generates a shock/vibration detection signal when detecting shock or vibration;
It has a function of checking for an abnormality in sector data of the disk medium currently being accessed when receiving the shock/vibration detection signal, and a function of generating an abnormality notification signal when an abnormality exists in the sector data. a magnetic disk control unit that directly controls a magnetic disk storage device and stops the disk medium when a continuous shock/vibration detection signal is received; and a magnetic disk control unit that is connected to the magnetic disk control unit via a data signal line group and that writes data. a disk cache memory for temporarily storing data; and a function of disabling the sector of the disk medium in which the abnormality occurred when receiving the abnormality notification signal and assigning the logical address of the sector in which the abnormality occurred to an alternative sector; A disk command having a function of writing data in the corrupted sector from the disk cache memory to the alternative sector when data in the sector is corrupted in a write operation, and notifying an error to a host device side when data in the sector is corrupted in a read operation. A magnetic disk control device comprising: a control section.