JPS60171682A - Retract system in disk system - Google Patents

Abstract

PURPOSE:To make operator's completion processing unnecessary by providing a delay period between power source disconnection by the operator and power source disconnection on a system and by realizing a retract operation for a disk device during this period. CONSTITUTION:When an operator turns on a power supply of a disk system, a switch a1 is turned on and a power source circuit (c) is fed. When an a2 is energized, a delay circuit (d) drives a relay (b) after a delay period T, and the a1 and the relay (b) constitute a close loop. Next, at the time of power source disconnection of the disk system, the a1 is disconnected by the operator and the delay circuit (d) releases the relay (b) after sufficient delay period T for the retract action, when a generator circuit (e) detects a2 disconnection and generates a retract signal V only for a period of T, which applies an interruption to a microprocessor inside the disk device. The disk device realizes the retract operation by itself.

Description

Detailed Description of the Invention: To protect the disk medium and magnetic head in a Winchester-type small magnetic disk device using a retraction method, specifically a stepper type, when power is turned off in a disk system having a disk drive. magnetic head f
:Relates to a retracting method in which a retracting operation for moving to a CSS (Contact Start Stop) area is performed by a seek operation of a disk device.

Conventionally, there are two types of drive methods for seek operations in Winchester-type small magnetic disk devices: a moving coil method and a stepper method. For operation, springs are used (mechanical means are also often used. This method has the advantage of being mechanically simpler and lower cost than the moving coil method. The disadvantage is that the seek operation is slow due to the need for a large torque when using a spring or tract operation.Also, when using a stepper type tract operation, the operator can execute the tract command without using a spring. Although means for implementing the retract command by a seek operation of a disk device have also been used, execution of the retract command by an operator cannot be expected to be reliable and goes against the goal of simplifying operability.

However, when the power to the disk system is turned off, it is still necessary to perform a retract operation to protect the disk medium and magnetic head for the purpose of file preservation in the disk device, and both of the above examples are similar to those described above. These drawbacks hindered the commercialization of products with high performance and low cost.

The present invention provides a small magnetic disk drive using a single stepper type, without using a spring, provides a delay time between turning off the power by the operator and turning off the power to the system, and requires no operator intervention during this time. The present invention solves the above-mentioned shortcomings by realizing the retracting operation in hardware without the need for retraction, and provides a tract method that eliminates the need for an operator to complete the termination process when the power is turned off. .

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

FIG. 1 is a block diagram showing the overall configuration of the l)) tract system according to the present invention. The present invention, as shown in the figure,
In an electronic computer system in which the retract operation in a Winchester-type small magnetic disk device F is realized by the seek operation of the disk device, when 1f is the power input terminal and 2 is the power output terminal, the power is turned on by the operator. , a first switching circuit A involved in disconnection, a second switching circuit B inserted in parallel thereto and controlled by a delay circuit described later, and the first and 7n2 switching circuits A and B. a power supply circuit C of the system to which power is supplied;
The opening/closing circuit A is made up of a delay circuit operated by the signal 3, and a tract signal generating circuit E which instructs the disk device F to retract or generates the tract signal 5 by the signal 3. A delay time sufficient to perform a disk drive retracting operation is provided between the power-off and the system power-off, and the retracting operation is realized by hardware during this time.

FIG. 2 is a diagram showing an example of a specific circuit configuration of the system of the present invention, and FIG. 3 is a diagram showing the operation timing of the circuit shown in FIG. 2. As shown in FIG. 2, the present invention
In a disk system having a Winchester-type small magnetic disk device f using a stepper type, there are a switch a1 involved in turning on and off the power by an operator, a switch a2 interlocking with this switch a1, and a switch a2. a delay circuit d operated by a signal 111;
A relay b that is inserted in parallel with the switch alk and is controlled by the delay circuit d, a power supply circuit C of the system supplied with oxygen by the switch a1 and the relay b, and the signal 111.
The circuit includes a tract signal generating circuit e which instructs the disk device f to perform a retract operation and generates a tract signal (2).

First, when the IL source of the disk system is turned on, the operator turns on the switch a1, and the power supply circuit C is supplied with power. - When switch a2 is turned on, delay circuit d drives relay b after delay time T (FIG. 3), and switch a1 and relay b form a closed loop. It's Kade.
l) The l-retract signal generation circuit e does not generate the retract signal V even when the switch a2 is turned on. In Figure 2, 1 is the power input terminal, 11 is the output terminal, and 1v is the relay b.
This is the drive signal.

Next, when the power to the disk system is turned off, the operator turns off the switch al, but the delay circuit d releases the telly relay b after a delay time T that is sufficient for the retract operation, and during this time the power is turned off. Acid supply continues in circuit C. At this time, the retract signal generating circuit e detects that the switch a2 is turned off, and generates the retract signal V for approximately the time T. Normally, a disk device has a built-in microprocessor, and the retract signal V interrupts the M processor, and the disk device itself realizes the retract operation in the interrupt processing routine. Power to the disk system will be turned off after the disk drive tract operation is complete.

As explained above, in a disk system having a small magnetic disk device using a stepper type, the present invention provides a delay time between turning off the power by an operator and turning off the power to the system, and during this time, the disk By realizing the tract operation of the device, there is an effect that the first child processing by the operator can be omitted.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is an operation timing diagram of the circuit shown in FIG. - First switching circuit, B... Second switching circuit. C... Power supply circuit, D... Delay circuit, E...
Retract signal generation circuit, F...disk device, 1...power input terminal, 2...
- Power output terminal, 3... Signal from the first switching circuit, 4... Signal for controlling the second switching circuit. 5... Signal instructing retract operation, al... Switch involving operator, a2... Switch linked with switch a1, b... Relay, C... Power supply circuit, d... Delay Circuit, e... Retract signal generation circuit, f... Disk device. Agent Patent Attorney Rikichi Somekawa

Claims (1)

[Claims] In order to protect the disk medium and magnetic head for file maintenance in Winchester type small magnetic disk devices, the magnetic head is started with C8S (contact).
In a multiplex computer system in which a retract operation for moving to a stop area is realized by a seek operation of a disk device U, a first IAJ closed circuit that is involved in turning on and off the power by an operator; Power is supplied by a delay circuit operated by a signal from the switching circuit, a second opening I11 circuit inserted in parallel to the first switching circuit MtI and controlled by the delay circuit RfJ, and the first and second switching circuits. The system's power supply circuit and the signal from the first opening/closing circuit of M mark instruct the disk device to perform a retracting operation, and the traction signal generation circuit and the traction signal generation circuit are connected to each other, and the operator disconnects the system's power supply. A disk system retracting method characterized in that a delay time sufficient to perform a retracting operation of the disk device is provided between the retracting operation of the disk device and a retracting operation of the node is realized during this time.