JPS6196572A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To avoid the occurrence of write and read errors and to reduce electric power consumption by detecting the temperature state in a head disk mechanism and inhibiting write and read in the inoperative state. CONSTITUTION:The output of a temperature sensor 1 in the head disk mechanism 5 is inputted to a sense amplifier 2, amplified and inputted to a write/read inhibiting circuit 3. It discriminates the output level of the sensor 1, decides the permission of write and read and informs a display part 4 and a host device of the output. When write and read are not permitted, a read/write instruction from the host device is interrupted in such a way that the device itself is read the moment the failure is displayed, and write is inhibited so as to inform the host device. As a result, write and read errors can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having a function of determining whether a write/read operation is possible or impossible depending on its internal temperature.

[Prior art] In conventional magnetic disk drives, the magnetic head and magnetic disk undergo thermal expansion at operating temperatures, resulting in misalignment between the data writing position and the magnetic head, and data written at high temperatures is lost. A read error occurred when starting at a low temperature, and conversely, data written at a low temperature resulted in a read error at a high temperature.

Another way to solve this problem is to always send hot air when the disk stops rotating to measure the temperature of the head disk [ear structure] and prevent the temperature from dropping. However, this method has the disadvantage that it consumes a large amount of power because hot air is supplied for a long period of time, and that it is difficult to set the temperature to the optimum operating temperature.

[Object of the Invention °j An object of the present invention is to provide a magnetic disk device t that eliminates all of the above-mentioned drawbacks, does not cause write/read errors, and consumes less power.

[Configuration of the Invention J The magnetic disk device of the present invention includes a head disk mechanism,
A sensor for detecting temperature inside the head disk mechanism, a sensor amplifier for amplifying the output of the sensor, and an output for the sensor amplifier ll'i: Accordingly, writing and reading to and from the magnetic disk are prohibited and the state thereof is controlled. The present invention is characterized in that it includes a prohibition circuit that notifies a host device, and a display section that displays the entire prohibition state of code readout.

[Implementation fl　’J Hereinafter, the present invention will be explained in detail with reference to the drawings.

Figure 1 shows an embodiment of the magnetic disk device of the present invention.

The output of the temperature sensor l that detects the temperature inside the head/disk frame structure 5 is input to the sensor amplifier 2, and the amplified output of the 'fA degree sensor is sent to the write/read inhibit circuit 3.
is input. The write/read inhibit circuit 3 determines the output level of the temperature sensor, determines whether read/write is possible for the magnetic disk device, and reports the output to the display unit 4 of the magnetic disk device and the host device.

For example, when starting up the system in the morning, the temperature inside the head/disk mechanism is expected to be low, but at that point the temperature sensor 1 detects the temperature state, and depending on the output level, the write/read prohibition circuit 3, the read/write operation is determined to be incomplete or not, and the display section 4 of the magnetic disk device is displayed.
At the same time, the device itself also prohibits outgoing writes and reports this status to the host device, thereby temporarily suspending write/read commands from the host device and avoiding read and write errors. .

〔Effect of the invention〕

As described in detail above, according to the present invention, by detecting the temperature state within the head-controlled disk mechanism and prohibiting writing and reading in an inoperable state, no writing/reading errors occur.

This has the effect of providing a magnetic disk device with low power consumption.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...Temperature sensor, 2...Sensor amplifier, 3...Writing/reading prohibition circuit, 4
... Display section, 5 ... Head disk mechanism. illustration

Claims (1)

[Claims] A head disk mechanism, a sensor that detects the internal temperature of the head disk mechanism, a sensor amplifier that amplifies the output of the sensor, and a state in which writing and reading of the sensor amplifier is prohibited according to the output of the magnetic disk. What is claimed is: 1. A magnetic disk device comprising: a prohibition circuit that notifies a higher-level device of the write/read prohibition; and a display section that displays the write/read prohibition state.