JPH0194564A - System for controlling floppy disk device - Google Patents

Abstract

PURPOSE:To minimize the energy consumption of a built-in battery by rotating the driving motor of an FFD only at the time of executing reading/writing to an FD when operated by the built-in battery and rotating it always while the FD is loaded when operated by an external power source. CONSTITUTION:A CPU 1 outputs an instruction to a floppy disk device (FDD) control part 2 and the FDD control part 2 executes the reading/writing to the floppy disk (FD) loaded in an FDD 3 in accordance with the instruction. A power source switching part 7 gives priority to a power from an external power source 5, the detection of the power is executed by a detecting part 8 and the FDD control part 2 is informed of the type of the power source. By this information, the FDD control part 2 always revolves, the driving motor while the FD is loaded when the power is the external power source 5 and revolves the driving motor of the FDD device 3 only at the time of executing the reading/writing to the FD when operated by a built-in battery 6. Thus, the energy consumption of the built-in battery 6 can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling a floppy disk device.

[Conventional technology]

Generally a floppy disk device (hereinafter referred to as FDD)
There are the following two methods for controlling.

[Method 1] Floppy disk (hereinafter referred to as FD)
The drive motor of the FDD is always rotated while the FDD is attached to the FDD.

[Method 2] The drive motor rotates only when reading or writing to the FD installed in the FDD. [Method 1] The drive motor is constantly rotating, so the FD
It has the advantage of being able to read and write at high speed because there is no waiting time before reading and writing, and the disadvantage of high power consumption.

[Method 2] has the advantage that, contrary to [Method 1], there is a waiting time until the drive motor rotates and the rotation stabilizes, so the read/write time is slow, but the power consumption is small.

Conventionally, the method for controlling an FDD has been performed using either the above-mentioned [Method 1] or [Method 2], regardless of the type of power source (external power source, built-in battery).

[Problem that the invention seeks to solve]

As mentioned above, in the conventional method, control is performed using the same method regardless of the type of power source, so in the case of [method 1], the built-in battery is quickly consumed, which is a drawback.
Method 2] consumes less power, but has the disadvantage that the FD cannot be read or deleted at high speed even when an external power supply is used.

[Means for solving problems]

When the invention is operated with a built-in battery,
The drive motor of the FDD rotates only when reading from or writing to the FD, and when operated by an external power supply, the drive motor always rotates while the FD is attached.

[Effect]

In the present invention, the control method is changed depending on the power source, so if the built-in battery is used, the power consumption is small, and if the external power source is used, the FD is read and read at high speed.

〔Example〕

Next, the present invention will be explained with reference to the drawings. Figure 0 shows an information processing apparatus using an FDD control method according to an embodiment of the present invention.

In the figure, a CPU 1 outputs a command to an FDD control unit 2, and the FDD control unit 2 reads and writes from an FDK installed in an FDD 3 according to the command. At this time, electric power is supplied to the drive motor of the FDD 3 from an external power source 5i and a built-in battery 6, which is supplied via a plug 4, through a power source switching unit 7. The power supply switching unit 7 is connected to the external power supply 5
Prioritize power from The detection unit 8 detects the power and notifies the FDD control unit 2 of the type of power source. In response to this notification, the FDD control unit 2 adopts [Method 1] in which the drive motor is always rotated while the FD is attached when the power is from the external power supply 5, and the FDD control unit 2 operates on the built-in battery 6. In such a case, [Method 2] is adopted in which the drive motor of the FDD device 3 is rotated only when reading from or writing to the FD.

In this way, since the control method is changed depending on the power source, [Method 1] or [Method 2], in the case of the built-in battery 6,
By adopting method 2, the power consumption is small, and in the case of an external power supply 5, by adopting method 1, the F speed is high.
Can read and write D.

〔Effect of the invention〕

As explained above, the present invention allows the control method to be changed depending on the power source, so the power consumption of the built-in battery can be reduced, and when an external power source is used, reading and swearing can be performed at high speed. be.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an information processing apparatus using an embodiment of the present invention. 1... CPU, 2... Floppy disk device control unit (F'DD control unit), 3... Fist/floppy disk device fR (FDD), 4... Plug, 5...
External power supply, 6 Φ...Built-in battery, 7...
Power supply switching section, 8 digits...detection section.

Claims (1)

[Claims] In a floppy disk device that operates using a built-in battery and an external power source, if the floppy disk device is operated by the built-in battery, the drive motor of the floppy disk device is connected to the floppy disk. The control for a floppy disk device is characterized in that the drive motor is rotated only when the floppy disk is read or written, and when the drive motor is operated by an external power supply, the drive motor is always rotated while the floppy disk is installed. method.