JPH0268782A - Head positioning control method - Google Patents

Abstract

PURPOSE:To improve the quality of a disk device and to shorten an access time by executing a write in executing a positioning more correctly at the time of writing and executing a read in executing the positioning a little roughly at the time of reading. CONSTITUTION:A controller 8 executes the positioning in setting a permissible range to a fine track to be set at the time of writing and executes the positioning in setting the permissible range to the fine track to be large at the time of reading based on servo information written to an area set beforehand on a recording medium 1. Thus, at the time of reading data recorded on the disk 1 by a head 2, the time of an on-track is shortened, the access time is shortened, the on-track is correctly executed at the time of writing the data, thereby, a reliability is improved, and the quality is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the positioning of a recording/reproducing head with respect to a track used in a disk drive device such as a magnetic disk drive device or an optical disk drive device.

[Conventional technology]

The read/write head (hereinafter referred to as head) of a magnetic disk device using an embedded servo system is generally positioning controlled by a stepping motor or servo motor.
It is configured to be able to read positional information embedded in a magnetic recording medium (hereinafter referred to as a disk) and trace a desired data track. In this positioning control method using the embedded servo type, the value of the preset fine track tolerance range is the same for both reading and writing.
A seek complete signal was output when the vehicle was completely on track (within the far track tolerance) after the seek operation was completed.

[Problem to be solved by the invention]

By the way, according to the positioning control method as described above, correction is performed at the time of reading or writing until the position is completely on-track after the end of the seek operation. At this time, since the correction is performed at least once per rotation of the disk, several corrections are required when it is difficult to get on-track, which increases the waiting time for the rotation of the disk and wastes a lot of time. As a result, there is a problem that the number of attempts increases and the access time becomes longer.

An object of the present invention is to propose a head positioning control method that can provide a disk device with less wasted time for positioning and a short access time.

[Failure to solve the problem]

In order to solve the problems faced by the prior art and achieve the above object, the present invention provides a recording medium drive device that writes or reads signals to or from a recording track on an information recording medium via a head. , Con1-Lola and Zarbo Love! ! J detection means and off-track amount comparison means, in a method for positioning the head device with respect to two recording tracks, based on servo information written in a preset area on the recording medium, When writing,
A head positioning control method characterized in that positioning is performed by setting a small tolerance range to a fine track, and positioning is performed by setting a large tolerance range to a fine track during reading.

[Effect]

According to the above means, the permissible range of the fine I rack is large during reading and writing by the head, and
Since it is set small when writing, the on-track time is shortened when reading data that has been recorded on the disk, shortening the access time, and accurately on-track when writing data. Reliability is improved and quality can be stabilized.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

1 and 2 are operational flowcharts of the embodiment, and FIG. 3 is a block diagram showing the control system of the disk device according to the embodiment.

In FIG. 3, the control system of the disk device is
spindle motor 3 and swing arm 4 that rotate
a data processing circuit 7 that controls the stepping motor 5 that oscillates the motor, and sends and receives signals to and from the head amplifier 6; It mainly consists of a servo circuit 9 that processes information and sends electrical signals related to servo information to a controller 8.

The controller 8 and a dedicated controller (not shown) are connected by a signal line 10b, and can process signals detected by the head 2 or signals sent to the head 2.

When driving a disk device, first, the power of the disk device is turned on. As a result, the spindle motor 3,
The stepping motor 5 and head amplifier 6 are also turned on, and the spindle motor 3 starts rotating. Next, the servo recalibration L7 drives the stepping motor 5, moves the head 2 once to all the tracks where servo information has been written, and takes the servo information into the RAM table 8a.
- Perform a ceremony.

This 41B waits for the input of the drive select signal, and when the drive select signal is input, the data processing circuit 7
becomes active and can perform read or write operations, and associated seek operations are also optionally performed.

On the other hand, when the drive select signal turns OFF, the disk device becomes idle. Then, when a drive select signal is input in this idle state, it returns to an active state and immediately returns to read/write operation.

Under such operating conditions, in the first embodiment, as shown in the flowchart of FIG. 1, when the controller 8 receives a seek command from the dedicated controller (step 1,
(hereinafter abbreviated as SL), the head 2 is transported to the target track by the stepping motor 5 (S2.S
3). Next, the head 2 detects the servo information and determines whether it is within the permissible range of fine track during readout (S4).
), if it is outside the allowable range, correction is performed sequentially in microsteps (S5). The permissible range at the time of reading is large, and the head 2 may be off-track to a position where reading is possible. Even if reading is not possible the first time, an off-track value within an allowable range is set in advance in the RAM table 8a so that reading can be performed by retrying.

Immediately after the head 2 is on track, a read seek complete (R, S, C) signal is sent from the controller 8 to the dedicated controller via the signal line 10a. Then, the head 2 reads data according to the read command (S6).

Utilizing the waiting time while the dedicated controller is performing processing, correction is performed sequentially in microsteps within the controller 8 until the head 2 is on-track within the allowable fine track range during writing (S7, S8). Then, immediately after on-track, complete the write seek (W, S
, C) Sends the signal to the dedicated controller as described above, and also sends the write enable (write t#my complete) signal (S9). As a result, when the controller 8 receives a write command, it writes the data, and otherwise waits for a seek command.

In the second embodiment, as shown in the flowchart of FIG.
When the controller 8 receives a seek command from the dedicated controller (Sll), the head 2 is moved to the target track in the same manner as described above (S12.513). Then, it is determined whether the next operation is a read or a write (S14),
An off-track value of one of the fine-track tolerance ranges is selected in advance.

In the case of reading, the controller 8 sequentially performs correction using microsteps so as to keep track of the permissible range at the time of reading (316, 517).

Immediately, a read seek complete signal is sent to the dedicated controller in the same manner as described above, and the head 2 performs reading in response to a continuation instruction. If a seek command does not come immediately, the dedicated controller uses the waiting time while processing to sequentially adjust the head 2 to within the allowable range when writing to the same track in preparation for the next write command. Correctly 517), write seek complete signal (8
18) in the same manner as described above, and also sends out a write enable signal. This allows the write command to be sent to the controller 8.
If received, write, otherwise wait for a seek command.

Further, if the above-mentioned determination is writing, correction is performed sequentially in microsteps so that the head 2 is on-track within the permissible range during writing (S15.S17).

Send write seek complete signal after correction 318
), write data.

Then, the head 2 remains on the on-track until the next command for reading, rewriting, or seeking operation is received (319).

The head 2 of the above embodiment is not equipped with an erase head, so if off-track writing is performed during rewriting, there will be unerased data, which will become a noise source and reduce the margin. Therefore, when writing, data is written on the track more accurately.

Further, when reading, if the head 2 is located at a position slightly off track, the read signal output will be small, but since the head amplifier 6 amplifies the width, reading is possible. Also, if it is in the position and cannot be read,
This is possible by re-reading.

Specifically, a deviation of about 3%, for example, is allowed during writing, and a deviation of about 30%, for example, is allowed during reading.

〔Effect of the invention〕

As explained above, according to the present invention, when writing, positioning is performed more accurately and re-writing, and when reading, positioning is performed a little more roughly and then read, thereby improving the quality of the disk device and shortening the access time. It has the effect of being able to do it.

[Brief explanation of the drawing]

1 and 2 are operational flowcharts of the embodiment, and FIG. 3 is a block diagram showing the control system of the disk device according to the embodiment. 1........disc, 2........
Head, 8... Controller, 8a...
・・・・・・RAM table, 9・・・・・・・・・
Servo outgoing circuit. Figure 2 Figure 3

Claims (3)

[Claims] (1) A recording medium drive device that writes or reads signals to or from a recording track on an information recording medium via a head, comprising a controller, servo information detection means, and off-track amount comparison means. In a method for positioning a head device with respect to a recording track, positioning is performed by setting a small tolerance to a fine track during writing based on servo information written in a preset area on the recording medium. A head positioning control method characterized in that, at the time of reading, positioning is performed by setting a large allowable range for fine track. (2) A seek operation is performed according to a command from the controller, and when writing, the head is corrected to fit within the preset fine track writing tolerance, and when reading, the head is adjusted to fit within the read tolerance as described above. 2. The head positioning control method according to claim 1, wherein the head positioning control method comprises: correcting the position of the head, and outputting a corrected seek complete signal. (3) Determine whether the controller command is for writing or reading in advance, prepare only one of the fine track tolerance values specified, and after the seek operation, make corrections to keep the head within the tolerance range, and make corrections. 2. The head positioning control method according to claim 1, further comprising outputting a post-seek complete signal.