JPH0337860A - Rotary storage device - Google Patents

Abstract

PURPOSE:To reduce loss time from the completion of a positioning operation to the start of a rotating position retrieval operation by reporting the completion of the positioning operation to a host device immediately after the positioning of a read/write head is completed. CONSTITUTION:When the host device issues a positioning instruction and the address of a track to be positioned to a signal line 51, a control circuit 11 receiving them calculates the travel direction and the moving distance of a head 18, and informs them to a positioning control circuit 12. The circuit 12 allows a driving current to flow on a signal line 55, and performs the positioning of the head 18 at an object track by driving a positioning mechanism 13. When the positioning operation is completed, the circuit 12 informs it to the control circuit 11 and a clock circuit 14 via signal lines 54, 57. The circuit 14 validates a signal line 60 after the lapse of constant time. The circuit 11 sets rotating position information on a storage circuit 17, and a comparator 16 compares a rotating position from a signal line 63 with that from a signal line 62, and sends a detection signal to the circuit 11 via a circuit 15 when coincidence is obtained, and informs the fact that the rotating position can be retrieved to the host device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary storage device such as a magnetic disk device, and more particularly to a method for detecting a desired rotational position after a positioning operation.

[Conventional technology]

In a rotating storage device such as a magnetic disk drive, when accessing the desired information, the read/write head is positioned on the desired track, the recording medium rotates, and the read/write head moves to the desired record. Conventionally, this type of rotary storage device moves the read/write head to the specified track when a positioning command is issued from the host device to position the read/write head to the desired track. After positioning and waiting for minute vibrations to subside after positioning the read/write head, the host device is notified that the positioning operation has been completed.

After this, the host device issues a rotational position search command to search for the rotational position where the target record exists, and while the rotational storage device searches for the specified rotational position, other rotational storage devices Processing was being performed on the storage device.

[Problem to be solved by the invention]

In the conventional rotary storage device described above, the completion of the positioning operation was reported to the host device after the positioning operation of the read/write head was completed and the minute vibrations had ended. There was a delay corresponding to the processing time of the host device until the search command was issued, and there was a loss time between the end of the positioning operation and the start of the rotational position search operation, which could result in a delay in finding the desired rotational position. . This is especially noticeable when the host device is processing another rotary storage device and cannot immediately recognize the end of the positioning operation for that rotary storage device.

[Means to solve the problem]

The rotary storage device of the present invention includes a positioning mechanism that positions a read/write head, a positioning control circuit that controls the operation of the positioning mechanism, and a timer that measures a certain period of time after the positioning operation of the positioning mechanism is completed. a clock circuit, a rotational position detector that detects the rotational position of the recording medium, a rotational position storage circuit that stores a desired rotational position, and a comparison operation between the output of the rotational position detector and the output of the rotational position storage circuit. and a rotational position detection circuit that outputs a signal indicating that a desired rotational position has been detected if the timing operation in the timing circuit is completed when a comparison match signal is received from the rotational position comparison circuit. It has a circuit.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a rotating storage device according to the present invention.

As shown in FIG. 1, the rotating storage device of this embodiment includes a microprogram control circuit 11. Positioning control circuit 12
1 positioning mechanism 13. Clock circuit 14, rotational position detection circuit 151, rotational position comparison circuit 16, rotational position storage circuit 17.
Read/write head 18, recording medium 19. and a rotational position detector 20.

When the host device attempts to position the read/write head to a target track, the host device places a positioning command and the address of the track to be positioned on the signal line 51. The microphrogram control circuit 11 receives this, calculates the direction and distance of movement of the read/write head, and notifies the positioning control circuit 12 through the signal line 53.

Positioning control circuit 12 applies a drive current on signal line 55 to operate positioner m13 to position read/write head 18 physically coupled thereto to a desired track.

When the positioning operation is completed, the positioning control circuit 12 notifies the microprogram control circuit 11 and the clock circuit 14 through signal lines 54 and 57, respectively.

When the timing circuit 14 is notified through the signal line 57 that the positioning operation has been completed, it measures a predetermined period of time until the fine vibrations of the read/write head stop, and outputs a signal after the period of time has elapsed. Activate line 60.

When the microprogram control circuit 11 is notified through the signal line 54 that the positioning operation has been completed, the microprogram control circuit 11 changes the signal line 5
This is notified to the higher-level device through 2. If the host device is in a state where it can process the rotary storage device, then a rotational position search command and rotational position information to be searched are placed on the signal line 51.

Upon receiving this, the microprogram control circuit 11 sets the rotational position information in the rotational position storage circuit 17 through the signal line 58. Subsequently, the rotational position comparison circuit 16 compares the target rotational position sent through the signal line 63 and the rotational position sent from the rotational position detector 20 through the signal line 62, and when they match, the rotational position comparison circuit 16 outputs a signal. Activate line 61.

When the rotational position detection circuit 15 is notified by the signal line 61 that the target rotational position has been detected, the rotational position detection circuit 15 connects the signal line 6
If 0 is an invalid state, nothing is done and the recording medium 19 rotates once and waits until the target rotational position is detected again.

When it is notified through the signal line 61 that the target rotational position has been detected, the signal line 60 is in the valid state and the reading/
If it is notified that the minute vibrations of the write head 18 have subsided, this is notified to the microprogram control circuit 11 via the signal line 59. Next, the microprogram control circuit 1 notifies the host device via the signal line 52 that the desired rotational position has been found, and
The rotational position information in the rotational position storage circuit 17 is reset through the signal line 58, and the comparison operation in the rotational position comparison circuit 16 is stopped.

〔Effect of the invention〕

As explained above, the present invention reports the end of the positioning operation to the host device immediately after the positioning of the read/write head is completed, thereby allowing the system to perform the following operations without changing the conventional operation flow of the host device. It becomes possible to receive a rotational position search command from a host device in advance, which has the effect of reducing loss time from the end of a positioning operation to the start of a rotational position search operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a rotating storage device according to the present invention. 11...Microprogram control circuit, 12.
...Positioning control circuit, 13...Positioning mechanism, 14...Timekeeping circuit, 15...
Rotational position detection circuit, 16... Rotational position comparison circuit, 17... Rotational position storage circuit, 18...
・Read/write head, 19...Recording medium, 20
...Rotational position detector.

Claims (1)

[Claims] a positioning mechanism that positions the read/write head; a positioning control circuit that controls the operation of the positioning mechanism;
a timing circuit that measures a certain period of time after the positioning operation of the positioning mechanism is completed; a rotational position detector that detects the rotational position of the recording medium; a rotational position storage circuit that stores a desired rotational position; and the rotational position detection circuit. a rotational position comparison circuit that performs a comparison operation between the output of the rotary position storage circuit and the output of the rotational position storage circuit; and a rotational position comparison circuit that performs a comparison operation between the output of the rotary position storage circuit and the output of the rotational position storage circuit; A rotary storage device comprising: a rotational position detection circuit that outputs a signal indicating that a rotational position has been detected.