JPS58159166A - Informing system for end of seeking action of magnetic disk - Google Patents

Abstract

PURPOSE:To shorten the time to obtain the next instruction, by executing information of the end of the seeking action of a magnetic disk by the timing detected from the shifting speed of a magnetic head before the seeking action is over. CONSTITUTION:A seeking action instruction given from a processor HOST is received by a comparator CON in a desk controller DSK and converted within the CON into a command to a magnetic disk DKU to be indicated to the DKU in the form of a mechanical action. A timer TIM produces a window to detect the deceleration time that is decided by the shift distance of a magnetic head. For the DKU, the magnetic head is positioned for shift at a prescribed track on the basis of a command given from the DKC. In this case, the shift positioning speed of the magnetic head is obtained from a speed detector attached to an actuator which performs the shift positioning of the magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk drive, and more particularly, to a seek operation completion notification method for a magnetic disk drive that improves overall processing efficiency by speeding up notification of sheet operation completion in the magnetic disk drive. .

B) Technical Background In general, magnetic disk devices are connected to upper-level processing devices.
Used as a random access file.

Unlike ordinary semiconductor memory, magnetic disk devices are
Even if random access is possible, a considerable amount of waiting time is required.

When such a magnetic disk device is used in a processing device, it is generally subjected to continuous control.

The processing device performs recording/reproduction on the magnetic disk device and issues a round track as a command. This command is accepted by the disk control device, and the processing device and the control device are separated.

The disk-based ## apparatus that receives the command moves the magnetic head to position it on a predetermined track. This head movement and positioning is generally referred to as seek. When this seek operation is completed, the disk control device notifies the processing device that issued the processing Yasugi command with a seek operation completion sound, and reconnects the processing device and disk system +1.
Which position (set sector) on a predetermined track is given as a command.

When the disk control device receives this set sector command, the connection between the processing device and the disk control device is separated again. After accepting this command, search for a specified sector in the disk I & storage, and when this sector is found, further reconnect the processing t71nt and the disk system@l device,
Record and reproduce information.

C) Prior art and viewing points By the way, in such a magnetic disk device.

The process that requires the most processing time is the process for the seek command.

That is, this seek requires an operation of moving and positioning the magnetic head.

In conventional magnetic disk drives, the procedure for ending processing for the /- command and accepting the next set sector command is to ensure that the next command is not accepted until the movement and positioning of the magnetic head has been completed. .

However, with this method, there is always a time lag between the end of processing and the arrival of the next command, which results in a significant drop in processing from the perspective of the overall process of recording/reproducing information to and from the magnetic disk. There was a drawback.

D) Object of the Invention Therefore, the object of the present invention is to provide a 4K seek operation completion notification method for a novel magnetic disk device that eliminates the above-mentioned drawbacks.

I) Structure of the Invention The present invention relates to a magnetic disk device that selectively moves and positions a magnetic head to a predetermined track on a magnetic recording medium to record/reproduce information.

The movement positioning of the magnetic head allows the seek operation to be completed with respect to the host device when the speed becomes less than a predetermined speed.
This can be achieved by the seek operation completion notification method of the magnetic disk drive, which is characterized by the ninth feature.

F) Examples of the invention The present invention will now be described with reference to examples.

FIG. 1 shows an embodiment of a seek operation completion notification method for a magnetic disk device according to the present invention.

In the figure, DKU is a magnetic disk unit, DICO is a disk controller a unit, 0ON is a control unit, and RIC? is the reference speed signal source part, OOM is the comparison -, TIM is the timer, HO8
T is the processing value - 7, respectively, 0 As explained in the technology background section, instructions from Hoeτ (instructions or commands)
Accordingly, I) KO performs each process on DKU.

Figure 2 is a diagram showing the moving speed of the magnetic head during a seek operation. Figure 2 (A) is a diagram showing a conventional seek operation completion notification system. (The completion of the seek operation is notified as indicated by the arrow position of "Tighten" when the magnetic head reaches #ItlL at a predetermined speed curve and completely reaches the undershade. The seek operation is completed, so HO8'lC4 is notified.

However, after the magnetic head is completely moved and positioned in this way, the operation notification is issued and the magnetic disk drive cannot do anything until the fifth command arrives from HO8T, and from the perspective of HO8T. Therefore, in the present invention, as shown in FIG. 2(B), the waiting time for the DKH operation becomes long as a whole, before the movement and positioning of the magnetic head is completely completed.

This is to notify HO8T of the completion of the seek operation.

The timing at which this completion notification is issued is indicated by the arrow in Fig. 2 φ), but this position depends on the characteristics of the head movement speed and the DK
Cable delay g% between U and DKO and control within LJKO 5
6 processing time (specifically, it refers to the rounding calculation processing time in the microprogram system).

A specific circuit configuration for notifying the completion of this seek operation is shown in FIG.

The seek operation command from HO8T is accepted at 0ON in DKH, and f is sent in OOM so that it becomes a command to DKU.
and instructs D[H as a mechanical operation.

At the same time, a predetermined time is set in TIM.

TIM is used to create a rounding window that detects the deceleration time determined by the distance traveled by the magnetic head.

In DKH, the magnetic head is moved and positioned on a predetermined track based on commands from I) KO.

At this time, the moving position of the magnetic head is determined by a speed detector (not shown) attached to an actuator for moving and positioning the magnetic head.

This speed detection signal is sent to OOM and compared with ARKF,
The arrow position shown in FIG. 2(B) is detected.

However, since the OOM output signal is also output when the magnetic head is accelerating, a TIM is provided in the present invention to detect only the speed during deceleration.

This timer detects number 9, which reaches a predetermined speed only during deceleration.

When this signal is detected, it is regarded as a seek operation completion notification.H
Notify O8T.

With this configuration, in the present invention, the notification of the completion of the seek operation is carried out immediately before the completion of the movement of the magnetic head, and the time required to receive and receive the next command can be shortened. Processing efficiency can be improved.

G) Effects of the Invention As described above, in the present invention, the time required to obtain the first command is reduced by notifying the completion of the seek operation of the magnetic disk device at a timing detected from the moving speed of the magnetic head before the completion of the seek operation. can be shortened.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the seek operation completion notification system of the magnetic disk device of the present invention, and FIG. In the 6〇 diagram, g D KU is the magnetic disk unit, DKO is the disk control unit, HO8T is the processing unit, OOM is the control unit, FjlllF is the reference speed signal generator, OOM Liaoping (A) 182

Claims (1)

[Claims] In a magnetic disk device that records/reproduces information by selectively moving and positioning a magnetic head on a predetermined track on a magnetic recording medium, the speed of moving and positioning the magnetic head is predetermined and is less than or equal to nine speeds. A seek operation completion notification method for a magnetic disk device, characterized in that seek operation completion is notified to the upper position of a circular line.