JPH0485769A - Reset time shortening method from power saving mode - Google Patents

Abstract

PURPOSE:To shorten the reset time from a power saving mode by storing the correction data that disappears with switch-off of a power supply into a OMICRON cylinder and then reading the correction data out of the cylinder when the power supply is switched on again. CONSTITUTION:A processor 20 receives an instruction from a host device via an interface control circuit 19 and instructs the supply of power if the power supply is cut by a power consumption saving circuit 22. A processor 25 received with the supply of power positions a head 16 at a #0 cylinder 2 and at the same time the correction data on the cylinder 2 is acquired. Then the correction data read out of a stand-by selector is corrected with the correction data obtained from the cylinder 2 and written into a RAM of a ROM/RAM 26. Then the head 16 is set at a cylinder 6 pointed by the host device. In this case, the corrected data written in the RAM is used. Thus the data on the cylinder 2 never disappears and therefore the reset time form a power saving state is shortened. Then the deterioration of the processing efficiency can be prevented.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a method for shortening the time it takes to return from a power saving state to a state where instructions can be executed from a state in which main parts are powered off to save power consumption. The purpose is to prevent a decline in system processing capacity, and it has a function that stops the power supply to all but some circuits in order to save power consumption.If no command is received for a predetermined period of time, the power supply will be stopped. When a command sent by the host device is received, power supply is restarted, correction data for servo control is collected from multiple locations on the disk and stored in memory, and then the stored correction data is used. ,
In a disk device that positions the head with respect to a cylinder designated by a host device, each time the correction data stored in the memory is updated, data is stored in a spare sector provided in the trunk of the cylinder that serves as a reference for head positioning. Correction data is written in advance, and when the power supply is resumed, the head is positioned on the reference cylinder, the correction data is read from the spare sector and used, and the head is positioned on the cylinder specified by the host device. The configuration is such that

[Industrial Field of Application] The present invention relates to a disk device installed in a laptop personal computer, etc., and in particular, in order to save power consumption, the present invention returns to a state where the main parts are powered off to a state where instructions can be executed. The present invention relates to a method for shortening the time required to return from a power saving state.

2. Description of the Related Art In recent years, as personal computers, especially laptop-type computers, have been required to be smaller and more battery-powered, there has been a demand for smaller and lower power consumption magnetic disk drives installed in these computers.

Therefore, if no command is sent to the magnetic disk device for a relatively long time, the power supply is cut off to all but the minimum necessary circuits to keep power consumption low, and the power is resupplied at the same time as the command is issued. A method is provided for executing the command.

By the way, depending on the usage condition of a laptop computer, the environment for the magnetic disk device changes greatly.
It acts as an external force on the servo control to accurately position and follow the target trunk.

For example, when a disk is tilted, different external forces are applied to the actuator that moves the head on the inner and outer sides of the disk depending on the difference in the angle of inclination. It is necessary to perform external force correction.

For this reason, in magnetic disk drives that perform precise head positioning using data such as external force correction, correction data is collected from multiple areas from the outer periphery to the inner periphery of the disk by resupplying power when a command is issued. However, it is necessary that the processing capacity of the computer system is not reduced in order to collect this correction data.

[Conventional technology]

FIG. 4 is a diagram illustrating an example of the prior art.

1 is a magnetic disk, 2 is a cylinder No. 0 provided on the outermost side of the magnetic disk l, 3 is a plurality of correction data acquisition cylinders, and 4 is provided on the innermost side of the magnetic disk 1. This is the highest numbered cylinder. Therefore, 2
The area between and 4 is the data storage area of the magnetic disk 1.

If a command is not sent to the magnetic disk drive even after a predetermined period of time has elapsed, the magnetic disk drive recognizes the command issued by the computer and activates part of the interface control circuit to resupply power. Unless otherwise specified, the power supply will be stopped. However, some magnetic disk devices supply power to the spindle motor and drive circuit that rotate the magnetic disk.

When the power supply is stopped, the head moves to magnetic disk 1, 5.
If the cylinder is located at the position shown in
When a command is sent from the computer, the interface control circuit resupplies power, and the magnetic disk drive becomes able to execute the command, the head moves as shown by arrow 2 and is positioned at cylinder 0 2.

Then, move sequentially as shown by the arrows ■, ■, ■, ■, ■, ■, and move to No. 0 cylinder 2 and correction data acquisition cylinder 3.
When data for external force correction is obtained for each cylinder 4 with the highest number, this correction data is stored in the RAM, and then moved as shown by the arrow ■ and stored in the RAM for the target cylinder 6 specified by the computer. precise positioning using corrected data.

[Problems to be Solved by the Invention] As described above, before executing the command sent by the computer after power is supplied again from the power consumption saving state, after performing a seek operation multiple times to obtain external force correction data, Since the head is positioned in the cylinder designated by the computer, it takes time for the command sent by the computer to become executable, and during this time the computer is unable to process data, resulting in waiting time.

Therefore, there is a problem that the processing power of the computer system is reduced.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to shorten the time from a power consumption saving state to a state in which instructions can be executed, thereby preventing a decrease in the processing capacity of a computer system.

[Means to solve the problem]

FIG. 1 is a block diagram illustrating the invention in detail.

The disk device 11 has a power consumption saving means 13 that stops power supply except for some circuits in order to save power consumption.
If no command is received from the host device 10 for a predetermined period of time, for example, the power supplied to the servo control means 15 and the write/continue output means 14 is cut off.

Then, when the interface control means 12 receives the command sent by the upper bag W10, the power consumption saving circuit engineer 3 restarts the power supply to the write/continue output means 14 and the servo control means 15.

The servo control means 15 positions the head 16 at a plurality of cylinders at predetermined positions on the disk 17 when data is not being transferred to the host device 10 during operation.
Means 1 for writing/continuing servo information read by the head 16
4, collects correction data for servo control, and stores it in memory 18.

Then, the servo control means 15 transfers the head 1 to the cylinder specified by the upper bag W10 via the interface control means 12.
When positioning the head 6, the correction data stored in the memory 18 is used to perform head positioning control with respect to a precisely specified cylinder.

As described above, when the correction data is stored in the memory 18, the servo control means 15 positions the head 16 at the cylinder that serves as a reference for head positioning, and writes each track of this reference cylinder via the writing/succession means 14. The same data as the correction data stored in the memory 18 is written into one or more of the spare sectors provided in the memory 18.

Then, as described above, when the power supply is resumed, the head 16 is positioned on the reference cylinder, the correction data for the reference cylinder at this time is acquired, and the correction data is read from the spare sector. The correction data is corrected using the correction data of the acquired reference cylinder and written into the memory 18, and the head 16 is positioned to the cylinder designated by the host device 10 using the corrected correction data.

[Effect]

By configuring as described above, when a command is received from the host device 10 and the power supply is restarted, there is no need to position the head 16 on cylinders at multiple locations on the disk 17 and collect correction data. Since the seek operation can be omitted, the time from the power consumption saving state to the instruction executable state can be shortened.

〔Example〕

FIG. 2 is a block diagram of a circuit showing one embodiment of the present invention.

The processor 20 operates by reading a program stored in the ROM 21, controls the interface control circuit 19, analyzes instructions sent by the host device, and executes data transfer with the host device. If a command is not received from the host device even after the period of time elapses, the power consumption saving circuit 22 is controlled via the interface control circuit 19,
Processor 20, interface control circuit 19, motor control circuit 37, and power consumption! Power to the circuits other than the ff reduction circuit 22 is turned off.

Then, when a command is sent from the host device, the power consumption saving circuit 22 is controlled to supply power again to the circuit that was powered off.

When the processor 25 is supplied with power, the ROM/R
A program is read from the ROM of the AM 26 and operated, and the motor control circuit 37 is controlled to rotate the spindle motor 36 at a predetermined rotational speed, thereby rotating the magnetic disk 1.

The head 16 reads data and servo information recorded on each track of the cylinder of the magnetic disk 1, and sends the data and servo information to the pulse detection circuit 27 via the amplifier circuit 34. The data and servo information pulses detected by the pulse detection circuit 27 are sent to the modulation/demodulation circuit 23, the drive control circuit 24, and the sample and hold circuit 31.

The modulation/demodulation circuit 23 demodulates the data and sends it to the interface control circuit 19, the drive control circuit 24 decodes the cylinder information in the servo information and notifies it to the processor 25, and the sample hold circuit 31 decodes the data of the head 16 from the servo information. The position information is extracted, converted into a digital value by the A/D conversion circuit 30, and sent to the processor 25.

The processor 25 outputs the seek control signal created based on this cylinder information and the position information of the header 6 to the ROM/
Correction is performed by referring to correction data stored in the RAM of the RAM 26.

Then, this corrected seek control signal is sent to the D/A conversion circuit 29, and the D/A conversion circuit 29 converts this seek control signal into an analog value and sends it to the analog control circuit 28.

The analog control circuit 28 sends a seek control signal of an analog value to the power amplifier 33, causing the voice coil motor 32 to supply current to move the head 16 to the cylinder position specified by the processor 25.

When power is supplied to the processor 25 and data is not being transferred to the host device, the head 16 is moved from the highest numbered cylinder 4 to the correction data acquisition cylinder 3 to the 0th cylinder 2, as shown in FIG. are sequentially positioned, and when data to be corrected for the servo control signal due to the influence of external force is acquired, it is stored in the RAM of the ROM/RAM 26.

When the head 16 arrives at the spare sector of cylinder No. 0, the correction data stored in the RAM is written.

FIG. 3 is a diagram illustrating the operation of FIG. 2.

When the processor 20 receives a command from the host device via the interface control circuit 19, it starts the power consumption saving circuit 22.
If the power is turned off, instruct the power to be supplied.

The processor 25 to which power has been supplied has the head 16
Assuming that the magnetic disk 1 is positioned at the cylinder 5 of the magnetic disk 1 shown in FIG.

The tracks of each cylinder of the magnetic disk 1 are shown in Figure 3).
As shown in FIG. 2, there are sectors for recording data from sector (1) to sector (n), and a spare sector is provided in the final area of the track. This spare sector is the sector (]
) to (0) is a replacement sector if there is a bad sector, but since the condition is that there is no media defect in cylinder 0, this spare sector is used as a replacement sector. Nothing happens.

Therefore, the correction data written in the spare sector provided in each track of the No. 0 cylinder is retained without being destroyed.

The head 16 positioned in the No. 0 cylinder 2 is composed of a plurality of heads, and the head No., O to head No.,
If it is up to m, for example, the correction data may be written only in the spare sector of the track accessed by head No. 0, or the correction data may be written in the spare sector of the track accessed by head No. 0.

It is also possible to write to some or all of the spare sectors up to m.

When the head 16 is positioned at the No. 0 cylinder 2, the processor 25 acquires the correction data of the No. 0 cylinder at this time, and subsequently acquires the correction data successively output from the spare sector.
When corrected with the correction data obtained from No. 0 cylinder 2, R
Write to RAM of OM/RAM26.

Then, as shown by the arrow ■ in FIG. 3(a), the head 16 is positioned in the cylinder 6 instructed by the host device, but the correction data at this time is RA of the ROM/RAM 26,
Use the corrected correction data written in M.

In this embodiment, a case has been described in which the power consumption 1Iff reduction circuit 22 does not turn off the power to the motor control circuit 37, but in order to increase the power consumption saving effect, the spindle motor 36 may be stopped.

〔Effect of the invention〕

As explained above, the present invention is applicable to a magnetic disk drive in which a seek control signal needs to be corrected using correction data obtained from multiple locations on a magnetic disk due to an external force, and when the power is cut off to reduce power consumption. By storing the correction data that disappears when the power is cut off in the No. 0 cylinder, when the power is supplied again, there is no need to read it from the No. 0 cylinder, which shortens the time it takes to recover from the power saving state. It becomes possible.

Therefore, it is possible to prevent a decrease in processing efficiency of the computer system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram explaining the present invention in detail, FIG. 2 is a block diagram of a circuit showing an embodiment of the present invention, FIG. 3 is a diagram explaining the operation of FIG. 2, and FIG. 4 is a conventional diagram. It is a figure explaining an example of a technique. In the figure, 1 is a magnetic disk, 2 is a cylinder number 0, 3 is a correction data acquisition cylinder, 4 is a cylinder with the highest number, 5 is a cylinder, 6 is a target cylinder, 10 is a host device, 11 is a disk storage, and 12 is a cylinder Interface control means; 13, power consumption wJ reduction means; 14, write/continuation means; 15, servo control means; 16, head; 17, disk; 19, interface control circuit; 20, 25, processor; 21, ROM; 22 is a power consumption saving circuit, 23 is a modulation/demodulation circuit, 24 is a drive control circuit, 26
is ROM/RA, M, 27 is a pulse detection circuit, 28 is an analog control circuit, 29 is a D/A conversion circuit, 30 is an A/D conversion circuit, 31 is a sample hold circuit, 32 is a voice coil motor, 33 is an electric power 34 is an amplifier circuit, 36 is a spindle motor, and 37 is a motor control circuit. Figure 2 l1y) Operation Σ Explanation Figure 16 Figure 3 -4,96-

Claims (1)

[Claims] 1) In order to save power consumption, the power supply is stopped except for some circuits, and if a command is not received for a predetermined period of time, the power supply is stopped and the host device (10 ) receives the command sent out, restarts the power supply, collects correction data for servo control from multiple locations on the disk (17) and stores it in the memory (18), and then stores the stored correction data. In a disk device (11) that positions a head with respect to a cylinder designated by a host device (1) using The correction data is written in a spare sector provided in the track of the cylinder that serves as a positioning reference, and when the power supply is resumed, the head (16) is positioned on the reference cylinder and the data is read from the spare sector. Read and use the correction data,
The head (16) is attached to the cylinder specified by the host device (10).
A method for shortening recovery time from a power saving state, the method comprising: positioning the power saving state; 2) In the disk device (11), when the power supply is resumed, the head (16) is attached to the reference cylinder.
2. The method for shortening recovery time from a power saving state according to claim 1, wherein when the reference cylinder is positioned, correction data for the reference cylinder is acquired and correction data read from the spare sector is corrected.