JP2655482B2 - Driving method of magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a magnetic head, and more particularly to a method for driving a magnetic head using an MR head.

[0002]

2. Description of the Related Art A magnetic head using an MR element is usually a composite head having a structure integrated with an inductive head, in which data is recorded by an inductive head and reproduced by an MR head. This composite head has a constant separation distance in the track circumferential direction between the gap position of the inductive head and the gap position of the MR head.

When the drive system of the actuator for driving the carriage on which the head is mounted is a rotary actuator, the gap position of the inductive head and the gap position of the MR head are displaced in the radial direction due to the influence of the yaw angle. . This amount is a value that varies depending on the track position. The offset seek by the servo that corrects this deviation amount is micro jogging.

A sector of the magnetic disk is composed of a pair of an ID section and a data section. When writing data, the ID section is loaded to confirm that the sector is the target sector, and the data is recorded in the data section.

Therefore, in a magnetic disk drive of a rotary actuator drive system using a composite head as described above, an ID section is read by an MR head, micro jogging is performed, and then a data section is read by an inductive head. Therefore, a format structure having a very long gap portion for micro-jogging must be provided between the ID portion and the data portion in the sector. Therefore, since the format has many gaps and is inefficient, the capacity of the device format is reduced.

[0006]

As described above, in the conventional magnetic disk drive, when the MR / inductive combined head is used, the gap position of the inductive head and the gap position of the MR head are constant in the track circumferential direction. Because of the separate distance, the format structure must be provided with a very long gap for micro-jogging for the purpose of correcting it. I will invite you.

[0007]

According to the magnetic head driving method of the present invention, the controller reads instructions from the target ID section so as to search for the pseudo ID section preceding by the time required for micro-jogging. The micro-jogging operation is started when the pseudo ID portion is detected, and thereafter, a normal search for the target ID portion is performed, and data is read / written from / to the target sector.

[0008]

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

FIG. 1A shows a format structure of a sector. Here, the time required for micro jogging is n
Data block # 7
The characteristics of the present invention will be described on the assumption that the data in (1) is read or written.

In each sector, ID and DATA are paired with the same data block number, there is a gap (GAP) between ID and DATA, and FIG.
There is a sector pulse 2 shown in (b).

First, when a data read or data write command to the data block # 7 is input to the controller of the magnetic disk drive, the controller conventionally searches for the data block ID # 7. The instruction is read so as to search the preceding data block ID # (7-n) by the time required for jogging, and the ID # (7-n) search pulse (FIG. 1)
In (c)), the data block ID # (7-n) is searched.

Next, when the data block ID # (7-n) is detected, the micro jogging operation is started from that point in time as indicated by the micro jogging operation pulse 6 (FIG. 1).
(F)) While performing micro jogging, ID
# 7 The original data block ID # 7 by the search pulse 4
Search.

When the data block ID # 7 is detected, a read or write operation is performed on the target data block # 7 (FIG. 1 (e)).

With the above-described controller operation, the gap between the ID section and the data section can be minimized irrespective of the micro-jogging time. The number of sectors per hit can be increased. Therefore, the capacity of the magnetic disk drive can be increased.

[0015]

As described above, in the method of driving a magnetic disk head according to the present invention, the number of passing sectors required for micro jogging is grasped in advance, and the number of sectors required for micro jogging is subtracted from the target ID section. Pseudo ID
Replace the instruction in the controller section to search for the section,
When the pseudo ID part is detected, the micro jogging operation is started. Thereafter, by searching the target ID portion as usual and writing data to the data portion of the target sector,
The gap between the ID part and the data part can be minimized irrespective of the micro-jogging time, and a large-capacity magnetic disk device can be realized by increasing the device format capacity due to the improvement in format efficiency.

[Brief description of the drawings]

FIG. 1 is a timing chart for explaining an embodiment of the present invention.

[Explanation of symbols]

 2 Sector pulse 3 ID # (7-n) search pulse 4 ID # 7 search pulse 5 DATA # 7 write / read pulse 6 Micro jogging operation pulse

Claims (1)

(57) [Claims] 1. An MR (Magneto-Resistor)
This is a method of driving a magnetic head having an inductive composite head and performing micro-jogging for correcting the gap distance in the radial direction.
Searching the ID section in front from the D section for the time necessary for micro jogging, and starting the micro jogging operation when detecting the ID section in front, searching for the target ID section, and reading / writing data to / from the target sector. A method for driving a magnetic disk head, comprising: