JPH03256276A - Device and method for magnetic storage device - Google Patents

Abstract

PURPOSE:To omit the mechanical movement operating time of a head group by detecting a head positioning deviated amount read out from a single head, and giving an offset according to the deviated amount. CONSTITUTION:A device control circuit 2 separates an inputted cylinder number into an effective cylinder number s4 and a head selection number S5, and the number S4 makes a head positioning circuit 3 send a control signal. The circuit 3 positions the magnetic head group at a prescribed position on a designated magnetic disk storage medium. Besides, the number S5 is sent to a head selection circuit 6, and a single head is selected from among plural write/read magnetic heads 7 built in a disk enclosure 4. Then, a read out signal is sent to the circuit 3, and positioning deviation is detected. Then, the voice coil motor of the enclosure 4 is driven, and the positioning deviation is corrected. Thus, physical head selection is executed without using a head select signal, and the mechanical movement operating time of the head group becomes not necessitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk storage device and method, and more particularly to a magnetic disk storage device and method, and more particularly, a magnetic disk storage device and method having a plurality of write/read heads and a pulse train-like magnetic disk storage device having a plurality of read/write heads and in which a group of heads is moved and positioned over a storage medium. The present invention relates to a magnetic disk storage device and method for recording and reproducing serial information without replacing storage media.

[Conventional technology]

In a conventional magnetic disk storage device, a group of write/read heads are moved and positioned at predetermined positions on a plurality of concentric cylinders on a storage medium specified by a cylinder number input into the device. A predetermined single head of the write/read head group designated by the head number is selected, and pulse train-like serial information input to the device is recorded in a single area on the storage medium via the selected predetermined single head. , information is stored by playing it back.

The storage capacity and storage density of magnetic disk storage devices have increased significantly in recent years, and relative positional deviation between the head and storage medium caused by temperature changes in the mechanical structure that supports the head can lead to incorrect reading of information. This is one of the factors.

Therefore, some large-capacity, high-density magnetic disk storage devices have a servo pattern on each concentric circle of each head of each cylinder of the storage medium-E, in other words, on a part of the track, for detecting positional deviation. The written servo pattern is read by the head selected during head positioning.
The positional deviation of the selected head is detected and compensated for by applying offset signals 1 to 1 to the movement positioning circuit of the head group.

[Problem to be solved by the invention]

In the conventional magnetic disk storage device described above, the head position shift compensation operation at the time of head switching involves head group correction based on the time the head passes through the position shift detection servo pattern area and the amount of head position shift detected as a result. This method has the disadvantage that it requires a mechanical movement operation time of 100%.

[Failure to solve the problem]

The magnetic disk storage device of the present invention moves and positions a head group consisting of a plurality of read/write heads to a position specified by a cylinder number with respect to a plurality of concentric cylinder numbers on a magnetic disk storage medium. In a magnetic disk storage device that selects one head and writes or reads pulse train serial information input to a predetermined position on the magnetic disk storage medium via the single head, (A) the cylinder number input to the device; means to separate the execution cylinder number and head number, (ji) l'li
f jt! 1) specified by the pointed cylinder number; (I) positioning means for moving the head group to a predetermined position on the magnetic disk storage medium; (C) selecting the single head specified by the head number from the head group; and means for writing or reading the serial information input to the device via the selected single head, (D> detecting the head positioning deviation amount from a part of the signal read from the selected single head) (E) means for applying an offset to the positioning of the head group according to the head positioning deviation amount.

〔Example〕

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

FIG. 1 is a block diagram showing one embodiment of the present invention.

The magnetic disk storage device shown in FIG. 1 uses a device control signal ffl! input/output to the magnetic disk storage device 1. The head selection input signal group S2 is connected to the device control circuit 2 and input to the magnetic disk storage device 1. The head selection input signal group S2 is connected to the head selection diagnosis circuit 5, and the head selection input signal group S2 is connected to the device control circuit 2 and input to the magnetic disk storage device 1. The write/read signal group S3 is connected to the data write/read circuit 7, and the head positioning control signal group S4, which is an output signal of the device control circuit 2, is connected to the head positioning circuit 3, and the head selection signal group is an output signal of the device control circuit 2. The control signal group S5 is connected to the head selection circuit 6, and the voice coil motor drive signal s6, which is the output signal of the head positioning circuit 3, is connected to the disk enclosure 4.
The head selection signal group s8, which is the output signal of the head selection circuit 6, is connected to the disk enclosure 4, and the write signal S10, which is the output signal of the data write/read circuit 7, is connected to the disk enclosure 4. The servo head read signal S7, which is the output signal of the disk enclosure 5, is connected to the head positioning circuit 3, and the read signal S9, which is the output signal of the disk enclosure 5Y4, is connected to the head positioning circuit 3 and the data write/read circuit 7. A write/read timing signal S which is an output signal of the read circuit 7
12 is a head; connected to the γ selection diagnostic circuit 5, and receives a head selection error signal S which is an output signal of the head selection diagnostic circuit 5.
], 1 are connected to the device control circuit 2.

The disk enclosure 4 houses a plurality of magnetic disk storage media, a magnetic head group consisting of a plurality of read/write magnetic heads and a servo magnetic head, a voice coil motor for positioning the magnetic head group, and the like.

Next, the operation will be explained.

When writing or reading information to the magnetic disk storage device 1, a predetermined cylinder number is first sent to the magnetic disk storage device 1 by the device control signal group S1.

When the device control circuit 2 receives the input cylinder number, it separates it into an effective cylinder number and a head selection number, and the effective cylinder number is sent to the head positioning circuit 3 via a head positioning control signal S4.

The head positioning circuit 3 receives a servo head read signal S.
7, the read signal of the servo magnetic head built in the disk enclosure 4 is input, and while the relative position is detected from the read signal of the servo magnetic head, the voice coil motor drive signal S6 is input to the voice coil motor built in the disk enclosure 4. The coil motor is driven to move and position the magnetic head group to a predetermined position on the magnetic disk storage medium specified by a predetermined effective cylinder number.

Next, the head selection number separated by the device control circuit 2 is sent to the head selection circuit 6 via the head selection control signal s5.
will be sent to.

The head selection circuit 6 selects a single magnetic head from a plurality of read/write magnetic heads built into the disk enclosure 4 based on a head selection number.

The signal read from the selected single read/write magnetic head is sent to the head positioning circuit 3 via the read signal s9.

A servo pattern for detecting positional deviation on a time-sharing basis is written in the readout signal S9, and the head positioning circuit 3 detects the positional deviation, and the head positioning circuit 3 detects the positional deviation and sends a voice coil motor drive signal S6 to the disk enclosure 4. Drives the voice coil motor to correct positional deviation.

After the above series of operations is completed, the device control circuit 2 instructs the magnetic disk storage device 1 via the device control signal group S1 to terminate the movement positioning operation to the predetermined cylinder number received by the device control signal group S1. I can report it to the outside world.

Thereafter, the write information and read information by the data write/read signal group S3 input/output to the magnetic disk storage device 1 are transmitted to the data write/read circuit 7 and the selected write/read magnetic head via the read signal S9 and the write signal S10. G; writes to and reads from a predetermined position on the magnetic disk storage medium.

In this embodiment, a head selection operation using the head selection signal S2 is not performed, but in order to maintain compatibility with a conventional magnetic disk storage device interface, the head selection signal S2 is input to the head selection diagnosis circuit 5, and the writing/reading operation is performed. The timing signal SL2 monitors the head selection value "+82" during the write/read operation, and the head selection error is sent to the device control circuit 2 by the head selection error signal Sll, and the device control circuit 2 outputs the device control signal group S1. The information is transmitted to the outside of the magnetic tape storage device 1 via the magnetic tape storage device 1.

〔Effect of the invention〕

The magnetic disk storage device and method of the present invention have the advantage that physical head selection can be performed without using a head selection signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic disk storage device, 2... Device control circuit, 3... Head positioning circuit, 4...
... Disk enclosure, 5 ... Head selection diagnostic circuit, 6 ... Head selection circuit, 7
...Data write/read circuit.

Claims (3)

[Claims] (1) Moving and positioning a head group consisting of a plurality of write/read heads to a position specified by a cylinder number with respect to a plurality of concentric cylinder positions on a magnetic disk storage medium, and selecting a single head from the head group; In a magnetic disk storage device that writes or reads pulse train serial information that is input to a predetermined position on the magnetic disk storage medium through a single head, (A) the cylinder number that is input to the device is determined by the execution cylinder number and the head; (B) positioning means for moving the head group to a predetermined position on the magnetic disk storage medium designated by the execution cylinder number; (C) means for separating the single head designated by the head number; means for selecting from the group of heads and writing or reading the serial information input to the device via the selected single head; (D) means for writing or reading the serial information input to the device through the selected single head; A magnetic disk storage device comprising: means for detecting a positional deviation amount; (E) means for applying an offset to the positioning of the head group according to the head positioning deviation amount. (2) Moving and positioning a head group consisting of a plurality of write/read heads to a position specified by a cylinder number with respect to a plurality of concentric cylinder positions on a magnetic disk storage medium, and selecting a single head from the head group; In a magnetic disk storage method for writing or reading pulse train serial information input to a predetermined position on the magnetic disk storage medium through a single head, (A) the cylinder number input to the device is determined by the execution cylinder number and the head; (B) a positioning procedure for moving the head group to a predetermined position on the magnetic disk storage medium designated by the execution cylinder number; (C) a step for separating the single head designated by the head number; selecting from the group of heads and writing or reading the serial information input to the device via the selected single head; (D) writing or reading the serial information input to the device through the selected single head; A magnetic disk storage method comprising: a step of detecting a positional deviation amount. (3) The magnetic disk storage method according to claim (2), further comprising a step of applying an offset to the positioning of the head group according to the amount of head positioning deviation.