JPH0423269A - Disk device - Google Patents

Abstract

PURPOSE:To realize energy saving by providing a means for decreasing the revolving speed of a motor when a disk is not accessed by a head for a prescribed period. CONSTITUTION:In the case of no access of the heads 33a and 33b to the disks 39a and 39 for the prescribed period, this is recognized by a disk control part 41 with an instruction of a CPU to narrow the pulse width of a pulse width control driver 45 via a signal S4, so that the number of revolutions of the motor 37 is decreased to 2,000r.p.m. By this method, the energy saving is contrived, and at the next access, the number of revolutions is raised in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a disk device that can save energy.

(Prior Art) Generally, a device such as a laptop computer is equipped with a magnetic disk device driven by a battery, and in such a magnetic disk device, the disk usually rotates at 3 GOO rpm.

(Problem to be Solved by the Invention) However, in such a magnetic disk device, even when the head does not access the disk, the disk rotates at 3600 rpm, which consumes a lot of battery energy. .

For this reason, when the disk is not accessed for a certain period of time, it may be possible to stop the rotation of the disk to save energy, but the next time the disk needs to be accessed, the time required for the disk to start rotating is It takes,
A problem arises in that the operator is made to wait.

The present invention was made in view of these problems, and its purpose is to provide a disk device that can save energy and can be started up in a short time when necessary. .

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a motor for rotating a disk, a head for reading and writing information from and to the disk, and a motor for rotating the disk of the head. A disk device comprising: a detection means for detecting whether or not there is an access to the disk; and a means for reducing the rotational speed of the motor when the detection means detects that the head does not access the disk for a predetermined period of time. be.

(Function) In the present invention, when the head or disk is not accessed for a predetermined period of time, the rotation speed of the motor is reduced.
Energy saving can be achieved.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a laptop computer using a disk device according to the present invention, and this laptop computer has a central processing unit (CPU)
1. Memory (MEM) 3. Keyboard controller 5.
Keyboard 7, display controller 9, display (DSP) 11, disk controller 13, magnetic disk device (DSK) 15, floppy disk controller 17, floppy disk device (FDD) 19
, a bus 21, a battery 23, and a switch 25.

The CPUI controls the operation of each part.

The memory 3 stores data control words (DCW), data, and the like.

This data control word contains a read or write command to the disk, the start address in memory 3 of data to be read from or written to the disk, the length of that data (data length), the track number of the corresponding disk, and the sector number. It consists of information such as.

The operator performs input from the keyboard 7.

A predetermined screen is displayed on the display 11.

Details of the disk device 15 are illustrated in FIG. 2 and will be described later.

Predetermined information is written in the floppy disk device 19.

The switch 25 is a switch for driving this laptop computer, and when this switch 25 is turned on, power is supplied from the battery 23 to each part.

FIG. 2 is a block diagram showing the detailed configuration of the disk device 15. As shown in FIG.

This disk device 15 includes a control section 29, an arm 31a,
31b, heads 33a-, 33bs, a rotation speed detector 35, a motor 37, and disks 39a and 39b.

The control unit 29 also includes a disk control unit (DSK control unit).
41, a power transistor 43, a pulse width control driver 45, a coil 47, a diode 49, and a capacitor 51.

The arms 31a, 31b move the heads 33a, 33b in the radial direction of the disk in response to a carriage control signal S1 sent from the disk controller 41.

The heads 33a and 33b read and write data to and from disks 39a and 39b.

The rotation speed detector 35 detects the rotation speed of the disk 39b (39g).

Motor 37 rotates disks 39a and 39b.

Disks 39a, 39b rotate at the same angular velocity.

A disk control section 41 controls each section of this disk device.

The pulse width control driver 45 changes the pulse width manually applied to the base of the power transistor 43 in response to a control signal sent from the disk control unit 41, and performs on/off control of the power transistor 43.

The coil 47, diode 49, and capacitor 51 rectify and smooth the signal sent from the power transistor 43, and
It is sent to the motor 37 as a C voltage.

Next, the operation of this magnetic disk device will be explained.

First, the case of reading data from a disk will be explained. The CPLII activates the disk controller 13 and sends the address of the memory 3 where the data control word (DCW) is written to the disk controller 13. The disk controller 13 reads the data of the data control word from the memory 3 from that address, learns whether the command is a read command or a write command, and sends the read command or write command, track number, and sector number through line 27. .

The disk control unit 41 receives a carriage control signal S.
1, the carriage is moved by the difference between the current track number and the target track number, and the heads 33a and 33b are positioned on the target track.

On the other hand, the disk control unit 41 knows the target sector number, converts the data S2 (serial data) read from the heads 33a and 33b into parallel data, and sends the specified sector number via the line 12 and the disk controller 13. Write to the address in memory 3 that was created.

On the other hand, when writing to the disks 39a and 39b, the data control word (DC
Data is sequentially read from the address specified by W) and sent to the disk controller 41 via the disk controller 13 and line 27.

When the byte data comes, the disk control unit 41 converts it into serial data, sends the serial data at the right timing based on the target sector number, and sends the serial data to the head 33a.
, 33b write data to the disks 39a, 39b.

In this case, only the data length specified by the data control word is written.

Next, the disk rotation control operation will be explained.

When reading and writing data to a disk, the motor 37 and the disks 39a, 39b are
It is controlled to rotate at rp+c.

That is, when the rotational speed of the disk sent from the rotational speed detector 35 exceeds 3800 rpra, the disk controller 4
1 narrows the pulse width of the pulse width control driver 45 to the power transistor 43 by the signal S4, and the DC signal is smoothed by the diode 49, the coil 47, and the capacitor 51.
7M pressure is lowered and the rotation speed of the motor 37 is lowered to 3600 rpm.

Conversely, when the rotational speed rises above 3GOOrpo+, the disk control unit 41 widens the on-pulse width for the power transistor 43 of the pulse width control driver 45,
The DC voltage sent to the motor 37 is increased so that the rotation speed of the motor 37 becomes 3BOOrpm.

In this way, the disk control unit 24 controls the rotation speed of the motor 25.

Next, the operation of changing the rotational speed of the disk, which is a feature of this embodiment, will be explained.

For example, 3
If there is no access to the heads 33a, 33b for a minute, the disk control unit 41 learns this from a command from the CPUI, narrows the pulse width of the pulse width control driver 45 via the signal S4, and sets the rotation speed of the motor 37 to 2000 rpm. Drop it.

Any part of the disk control unit 41, the disk controller 13, or the CPU may detect that there is no access to the disk for a certain period of time.

When the disk is accessed with the rotation speed reaching 2000 rpm, the disk control unit 4 outputs the signal S3.
After widening the on-pulse width of the pulse width control driver 45 and increasing the rotational speed of the motor 37 to 3800 rpm while monitoring, the above-described read or write processing is performed.

As mentioned above, if there is no access for 3 minutes, before lowering the rotation speed of the motor 37, check the current track number, and if the current track number (head position) is at a sufficiently stable head position, the head 31a , 31b are not moved to the outer periphery. However, if 2000rp
If the heads 33a and 33b cannot fly stably above the disks 39a and 39b when the rotation speed is reduced to m, after moving the heads 31a and 31b to the outer periphery, the rotation speed is reduced to 2000 rpm and the head 31a , 31
Try to levitate b.

Thus, according to this embodiment, when there is no access to the disk for a certain period of time, the number of rotations of the motor 37 is reduced, so that energy can be saved.

Furthermore, when there is an access next time, the rotation speed can be increased in a short time because the rotation speed is simply increased from 200 Orpm to 380 Orpm.

Further, the present invention can be modified in various ways.

In the above-described embodiment, if there is no access for 3 minutes, the rotation speed is reduced from 3 [iloorp to 200 rpm, but if there is no access for 3 minutes, the rotation speed decreases to 3800
If there is no access for 3 minutes, the rotation may be dropped to 1100Orp, and if there is no access for another 3 minutes, the rotation may be stopped.

That is, the rotation speed may be lowered in several stages depending on the length of time without access.

Further, in the above-mentioned embodiments, a magnetic disk device was explained, but it goes without saying that the present invention can also be applied to an optical disk device.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a disk device that can save energy and can be started up in a short time when necessary.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a laptop computer using a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of the disk device. 1...CPU 3...Memory 29...Control section 33a, 33b - Head 35...Rotation Number detector 37...Motor 39a, 39b...Disk

Claims (1)

[Claims] (1) A motor that rotates a disk; a head that reads and writes information from and to the disk; a detection means that detects whether or not the head is accessing the disk; and that the head does not access the disk for a predetermined period of time. a means for reducing the rotational speed of the motor when the detection means detects the rotation speed of the motor.