JP2611201B2 - Magnetic disk device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly, to a magnetic disk device that guarantees execution of a minimum frequency seek operation for all data surfaces.

(Prior Art) A magnetic disk device used as an external storage device of a computer system has been required to have extremely high reliability and durability. For this reason, various improvements have been made, such as improving the characteristics of the magnetic disk itself, which is a recording medium, and adopting a structure in which the magnetic head and the magnetic disk are housed in a case having a closed structure in order to prevent dust from entering. But,
When a magnetic disk device is used for a long period of time, there is a considerable difference in the use of the device, and this difference in use may cause a difference in the frequency of occurrence of failures. .

In other words, when the magnetic disk is used for a long period of time and the device is used at an appropriate frequency, the failure rate is relatively low, but the device is used less frequently. Has a relatively high phenomenon.

(Problems to be Solved by the Invention) Accordingly, there has been a problem that a device that is used less frequently may have reduced performance or become inoperable during long-term use.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic disk device capable of preventing a trouble occurring when a non-use period is long, and confirming a data surface.

(Means for Solving the Problems) In order to achieve the above object, a magnetic disk drive according to the present invention is provided with a timer circuit that inputs a timer set signal, starts time measurement, and sends out a time-out signal after a predetermined time has elapsed. And a seek operation procedure for sequentially performing a seek operation up to the maximum cylinder after positioning the magnetic head from an arbitrary position to the cylinder 0, and a read operation procedure for performing a data surface read operation with all magnetic heads in each cylinder. A read-only storage circuit, and a seek operation procedure and a read operation procedure from the read-only storage circuit when the timer set signal is transmitted and the time-out signal is input upon input of a control signal from the device or termination of the read operation. A control circuit for reading out and transmitting a drive control signal according to these procedures; A positioning drive circuit for positioning the magnetic head on the magnetic disk in accordance with a drive control signal from the control circuit, and performing a seek operation on all data surfaces at predetermined time intervals set by a timer circuit. It is configured.

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

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

In FIG. 1, 1 is a positioning drive circuit, 2 is a magnetic head, 3 is a control circuit, 4 is a read-only recording circuit, 5 is a timer circuit, and 6 is a host device.

The positioning drive circuit 1 of the magnetic disk device is a circuit for positioning the magnetic head 2 on the magnetic disk 7 in accordance with the drive control signal 11 from the control circuit 3.

The control circuit 3 operates in response to a control signal 14 from the host device 6, and controls the positioning drive circuit 1 in accordance with an operation procedure stored in a read-only circuit 4 provided in the control circuit 3. And a circuit for reading information from the magnetic disk 7 via the magnetic head 2.

The timer circuit 5 receives a timer set signal 12 from the control circuit 3.
And sends a timeout signal 13 to the control circuit 3 after a lapse of a predetermined time, for example, 48 hours.

Next, the operation of the magnetic disk drive according to the present invention will be described in the second.
This will be described with reference to the flowchart shown in the figure.

Normally, the positioning control circuit 1 is controlled by the host device 6 via the control circuit 3. The control circuit 3 outputs the timer set signal 12 to set the timer circuit 5 (reference numeral a). The timer circuit 5 receives the timer set signal 12 and starts counting time. When a preset time has elapsed (reference numeral b), the timer circuit 5 sends out a timeout signal 13 to the control circuit 3 (reference numeral c). .

Upon receiving the timeout signal 13, the control circuit 3 checks whether interruption is possible, that is, whether the host device 6 uses the positioning drive circuit 1 (reference numeral d). If the host device 6 is using the positioning drive circuit 1, it waits for its use to be completed. When it is not used or when it has been used, the magnetic head 2 is used.
Is moved to the initial state (reference symbol e), and then the seek operation is started according to the seek operation procedure stored in the read-only storage circuit 4 (reference symbol f).

After the positioning of the magnetic head 2, reading of all the heads is executed according to the read operation procedure, and it is confirmed whether or not the head can be read without error (reference numeral g). When the read operation in the last cylinder is completed (reference numeral h), the control circuit 3 sends the timer set signal 12 again to set the timer circuit 5, and waits for the timeout signal 13 to be sent again.

The control circuit 3 sends a busy signal 15 to the host device 6 from the start of the movement of the magnetic head 2 to the initial state to the completion of the read operation in the last cylinder, so that the magnetic head 2 is in use. Inform that

(Effects of the Invention) As described in detail above, by using the magnetic disk device of the present invention, the magnetic head is guaranteed to perform the lowest frequency seek operation on all data surfaces and to execute the read operation. As a result, the data surface is guaranteed, so that the trouble that occurs when the non-use period is long can be prevented beforehand, and the data surface can be confirmed, so that the reliability of the magnetic disk device can be maintained. There is.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of the embodiment of FIG. DESCRIPTION OF SYMBOLS 1 ... Positioning drive circuit 2, ... Magnetic head 3 ... Control circuit 4, ... Read-only memory circuit 5 ... Timer circuit, 6 ... Host device 7 ... Magnetic disk, 11 ... Drive control signal 12 ... ... Timer set signal 13 ... Time act signal, 14 ... Control signal 15 ... Busy signal

Claims (1)

(57) [Claims] 1. A timer circuit for inputting a timer set signal, starting time measurement, and sending out a time-out signal after a lapse of a predetermined time, and positioning a magnetic head to a cylinder 0 from an arbitrary position, and sequentially to a maximum cylinder. A read-only storage circuit for storing a seek operation procedure for performing a seek operation and a read operation procedure for performing a data surface read operation with all magnetic heads in each cylinder; and inputting a control signal from the device or ending the read operation. A control circuit that reads the seek operation procedure and the read operation procedure from the read-only memory circuit when the timer set signal is transmitted and the timeout signal is input, and transmits a drive control signal according to these procedures; The magnetic head is positioned on the magnetic disk according to the drive control signal from Comprising a positioning drive circuit for a magnetic disk apparatus and performs a seek operation for all data surfaces in a given time interval set by the timer circuit.