JPH0540926A - Method for recording signal to magnetic disk - Google Patents

Abstract

(57) [Abstract] [Purpose] A servo pattern having a width equal to the track pitch can be easily recorded. A recording head 2a having an R / W gap 3 having a width equal to the track pitch TP, and an erasing head having a pair of erasing gaps 9 and 10 arranged so as to correspond to both ends of the R / W gap 3. Prepare a composite head with 2b. R / W gap 3 for initialization data
Then, the both sides are erased by the erase gaps 9 and 10. The servo pattern is recorded between the track centers with the R / W gap 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording initialization data and servo patterns for track servo on a magnetic disk used in a floppy disk drive or a magnetic disk drive similar to this.

[0002]

2. Description of the Related Art A floppy disk 1 as shown in FIG.
Has a large number of tracks T0 to TN concentrically. Each of the tracks T0 to TN includes a plurality of sectors, and each sector includes an ID field, a gap (GAP), and a data field, as shown in FIG. Information indicating the start and address of a sector is recorded in the ID field, and data and CR are recorded in the data field.
C bits and the like are recorded, and the gap acts as a buffer zone for protecting data.

By the way, it is practically difficult to directly write the main information data on the non-recorded disc, and therefore, as shown in FIG.
In accordance with the above format, initialization data including ID field information and necessary information in the data field is written in advance. In addition, a servo pattern for track servo that causes the magnetic head to accurately follow a track may be written.

FIG. 5 shows data recording areas D0 to D2, servo pattern recording areas S0 to S3, and non-recording areas M0 to M3 in tracks T0 to T2 of a conventional 192 TPI (tracks per inch). Data recording area D0 to D
2 is arranged so that its center coincides with the center of each track T0 to T2. Servo pattern recording area S0-
S3 is recorded by the same magnetic head as the magnetic head for recording the initialization data, and data recording areas D0 to D2 are recorded.
Tracks T1 to T2 having the same width as the track width TW of
Are located in the middle of each other. The servo pattern recording area S0 outside the outermost track T0 is written at the same position as when there is a track further outside. Since the track pitch TP is smaller than 2TW,
A part of the servo pattern recording areas S0 to S3 is on the extension of the data recording areas D0 to D2. Therefore, the track width T
When scanned with a W magnetic head, the data recording areas D0 to D
2 is scanned and the servo pattern recording area S0
A part of .about.S3 is also scanned and the record of the servo pattern can be read. For example, in the track T0, the first servo pattern recording area S0 is first read, and the read output level is held. Then the second
Servo pattern recording area S1 is read, and this read output level is compared with the read output level of the already read first servo pattern recording area S0, and the magnetic head is set so that this comparison output (error output) becomes zero. The moving DC motor, voice coil motor, or linear motor is controlled. Even if it is a stepping motor,
In the case of multiple track steps, control by a servo pattern is possible. By performing control by the servo pattern as described above, the magnetic head can be aligned with the centers of the tracks T0 to T2.

[0005]

However, in recent years, the density of floppy disk devices has increased, and for example, 384T.
There are PI disk devices and 768 TPI disk devices. Then, there is a case where it is desired to read the data recorded by the low track density disk device of 192 TPI by the high track density disk device of 384 TPI or 768 TPI. In this case, if the center of the track is aligned with the center of the magnetic head of the high track density disk device, the data can be read normally. However, the servo pattern recording areas S0 to S3 are formed to have the same width TW as the track,
Since it is separated from the center of the track by the distance A, the portion scanned by the magnetic head is reduced, and the S / N becomes worse, or in the worst case, the servo pattern cannot be read.

In FIG. 5, the track widths of the servo pattern recording areas S0 to S3 and the data recording areas D0 to D3 are shown.
The track width is the same because both the servo pattern and the data are recorded using the data recording magnetic head. Further, in recording on a floppy disk, a tunnel erase type magnetic head is used in order to solve the problem of off-tracking of the magnetic head. Therefore, as shown in FIG. 5, non-recorded areas M0 to M3 having a predetermined width are formed between the data recording tracks, and the width of the data recording track is narrower than the track pitch. 1
When the servo patterns are positioned between the data recording tracks such that one servo pattern is shared by two adjacent tracks, the servo patterns are necessarily separated from the center of the track by the distance A.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a signal recording method for a magnetic disk which can easily achieve recording of initialization data and recording of servo patterns so as to have non-recorded areas on both sides.

[0008]

According to the present invention for achieving the above object, a method of recording initialization data and a servo pattern for track servo on a recording medium magnetic disk so that a plurality of tracks are concentrically formed. In a recording head having a recording gap having a track width equal to the recording track pitch of the initialization data, and erasing having a pair of erasing gaps arranged so as to correspond to both ends of the recording gap. A step of preparing a composite head composed of a head and a step of aligning the center of the recording gap with the center of the track, recording the initialization data by scanning the disk with the recording head, and Both ends of the formed recording area of the initialization data are The recording head of the initialization data by erasing the recording track of the initialization data, and positioning the recording gap between the center of one track and the center of another track adjacent to this track. The step of scanning the disk to record the servo pattern.

[0009]

In the present invention, since the gap of the recording head has a width equal to the track pitch, it is possible to record a servo pattern having a width equal to the track pitch using this recording gap. Since the erase data is tunnel-erased by the erase head, a non-recorded area (erase area) is formed on both sides of the recording track of the initialization data, so that the off-track of the magnetic head can be dealt with. Therefore, according to the present invention, the initialization data and the servo pattern having different track widths can be recorded easily and at low cost by the same head.

[0010]

EXAMPLES Next, examples of the present invention will be described. FIG. 1 shows a data recording area D0 to D4 and a servo pattern recording area S of a 192TPI floppy disk according to an embodiment of the present invention.
0 to S5 and non-recorded areas M0 to M5 are shown. Initialized data recording area D0 through the format shown in FIG.
D4 has a track width TW and is written so as to coincide with the centers of the tracks T0 to T4 as in the conventional case. On the other hand, the servo pattern recording areas S0 to S5 have a width equal to the track pitch TP extending from the center of each track T0 to T4 to the center of the adjacent track. That is,
Since TP> TW, the servo pattern recording area S0-
The width of S5 is larger than the track width Tw.

The recording pattern as shown in FIG. 1 can be formed by the magnetic head 2 shown in FIG. This magnetic head 2 has a track width TW corresponding to 192 TPI.
R / W with a width larger and equal to the track pitch TP
A read / write head 2a composed of a core 4 having a (read / write) gap 3 and a pair of erase gaps 9, 1
It is a composite head with an erasing head 2b consisting of a core 11 having zeros. The erase gaps 9 and 10 having the width TE are arranged so as to correspond to both ends of the R / W gap 3.
The width TE of the erase gaps 9 and 10 is set to (TP-TW) / 2.

When the pattern of FIG. 1 is obtained using the magnetic head 2 of FIG. 2, an erase current is passed through the erase head 2b including the erase gaps 9 and 10, and an R / W including the R / W gap 3 is provided. A recording current for initializing data is supplied to the head 2a to sequentially form the data recording areas D0 to D4 shown in FIG. At this time, the center of the R / W gap 3 is made to coincide with the center of the track. The R / W gap 3 forms the same recording track as the track pitch TP, but both ends thereof are erased by the erase gaps 9 and 10. Therefore,
A data recording track having non-recorded areas M0 to M4 between the tracks can be obtained. The width of this data recording track is the desired track width TW. Next, R / W gap 3
Are positioned between the centers of the data recording tracks, the erasing head 2b is turned off, and the servo patterns S0 to S5 are recorded by the R / W head 2a as shown in FIG. The track width of the servo patterns S0 to S5 is the track pitch TP.
be equivalent to. The servo patterns S0 to S5 are recorded at a predetermined angular position on each track T0 to T4 with timing adjustment.

In FIG. 1, the write areas D0 to D4 and S0 to S5 of the data and servo patterns are shown by hatching for explanation, but in reality, they are recorded bit by bit by the MFM method or the like. .. Then, the servo pattern is formed by continuously recording a plurality of bits.

When data is read from a disk having the pattern shown in FIG. 1 by a high track density disk device of, for example, 384 TPI, the track width of the magnetic head becomes narrow. However, at the center of the gap of the magnetic head, the track T
If it is aligned with the center of 0 to T4, the data recording area D0 to
The data on D4 can be read reliably. Further, the reading of the servo pattern recording areas S0 to S5 and the track servo by the high track density magnetic head are performed in the same manner as in the conventional case. At this time, since half of the gap of the magnetic head scans the servo pattern recording areas S0 to S5, S / N
It doesn't get too bad. Therefore, the track servo based on the reading of the servo pattern is well achieved.

According to this embodiment, the track pitch TP is set by using the head used for the recording of the tunnel erase system.
Since it is possible to record a servo pattern having a width equal to, the recording of a servo pattern having a width equal to the track pitch TP can be easily achieved at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing a recording pattern on a magnetic disk according to an embodiment of the present invention.

FIG. 2 is a plan view showing a magnetic head according to an embodiment of the invention.

FIG. 3 is a plan view of a magnetic disk.

FIG. 4 is a diagram showing a data format.

FIG. 5 is a plan view showing a conventional recording pattern.

[Explanation of symbols]

 3 R / W gap 9, 10 Erase gap

Claims (1)

[Claims] 1. A method of recording initialization data and a servo pattern for track servo on a recording medium magnetic disk so that a plurality of tracks are concentrically formed, wherein a track width equal to a pitch of recording tracks of the initialization data is set. Preparing a composite head comprising a recording head having a recording gap and an erasing head having a pair of erasing gaps arranged so as to correspond to both ends of the recording gap; The initialization data is recorded by aligning the center of the recording gap with the center and scanning the disk with the recording head, and both ends of the recording area of the initialization data formed by the recording head are connected to the erasing head. Erase by initializing day Forming a recording track, another adjacent to this track and the center of one track
Positioning the recording gap between the track and the center of one track, and scanning the disk with the recording head to record the servo pattern.