JPH01179215A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform tracking servo by using a magnetic head for preceding erasure at the time of performing formatting by fetching a tracking signal in the area section of each sector at the time of performing the formatting, and performing tracking in a data area section. CONSTITUTION:When a format mode signal is supplied to a write gate signal generation circuit 14, a change-over switch 10 is connected to an erasure signal generation circuit 13 side, and an erasing operation is performed by the magnetic head 8 for preceding erasure. Also, a write gate signal is supplied to a gate circuit 9, and ID data is recorded in an ID area by a magnetic head 7 for recording and reproduction. The ID data is also supplied to a muting signal generation circuit 15, and when the ID data is completed, a muting signal is outputted, then, the change-over switch 10 is switched to a data reproduction circuit 11 side. Then, a signal for tracking servo is supplied from the magnetic head 8 for preceding erasure to a tracking servo circuit 12 via the change-over switch 10, and the tracking is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device such as a hard disk device.

[Summary of the invention]

The present invention provides a magnetic recording/reproducing device that has a magnetic head for advance erase and uses the magnetic head for advance erase also for tracking servo. In addition, in the data area section, the tracking servo signal is captured from the erase magnetic head to perform tracking servo, and even during formant, the advance erase magnetic head is used to accurately track. It is designed to perform servo.

[Conventional technology]

For example, in a magnetic recording/reproducing device such as a hard disk drive, data is recorded on a disk, which is a recording medium, by forming a plurality of concentric or spiral tracks (one track is one track). One trunk is made up of multiple sectors. As shown in FIG. 5, each sector has its own starting position and sector number.

It consists of an ID area in which an identification signal ID such as ID is recorded, and a data area in which data is recorded.

Now, in the above-described disk device, a tracking servo magnetic head is usually provided on the back side of the disk.

FIG. 4 is an explanatory diagram of the tracking servo.

In the same figure, +1) is a cross section of a part of the disk, (2)
are recording and reproducing tracks formed on the front side of the disc. (3) (41 is a pair of tracking servo signal trunks that are formed in advance on the opposite side of the disk where the trunk (2) is formed.This pair of tracking servo signal trunks +3) +4 ) across the center line of the trunk (2) in the running direction of the disc,
formed in symmetrical positions. Conventionally, a tracking magnetic head (5) is generally placed on the disk where the tracking servo signal tracks (3) and (4) are provided. This tracking servo magnetic head (5) reads the signal from the tracking servo signal track (31 (41), and based on both the read signals, performs data output, data writing, and Tracking is performed at the time of formatting, in which identification signals are inserted into the ID areas of all sectors on the track.

In addition, in the above-mentioned disk device, recording or reproduction is possible in sector units, and when recording new data, conventionally, generally, as shown in FIG.
), new data is overwritten on previously recorded data by a recording or reproducing magnetic head (6) disposed opposite to the recording or reproducing head (6).

[Problem that the invention seeks to solve]

Recently, the recording density of recording media such as hard disk devices has been increasing. If this high-density recording is overwritten as described above, the previously recorded data will not be completely erased, resulting in blood overwriting noise.

Therefore, in order to ensure the desired erasure rate and compatibility margin by preceding the recording or reproducing magnetic head, a pre-erase magnetic head with a slightly larger gap width than the recording or reproducing magnetic head is used for recording. A method has been proposed (see Japanese Patent Laid-Open No. 193107/1983).

When recording new data on a recording medium using this advance erase magnetic head, the previously recorded data is erased by the advance erase magnetic head, and then the new data is recorded by the recording reconstruction magnetic head. data is recorded.

Now, as mentioned above, conventional hard disk drives are equipped with a magnetic head for tracking servo, but the magnetic head for advance erase is not only used for erasing.
It is conceivable to use it also for tracking servo and omit this tracking servo magnetic head. This is because the advance erase magnetic head provided on the same side as the recording/reproducing magnetic head (6) can take in the signal of the tracking signal track (31(4)).

Now, when the advance erase magnetic head is used for servo purposes, there is no problem since the advance erase magnetic head can be used exclusively for tracking when reading data recorded on the track 2) of the disk. Also, when writing data, the ride gate signal is set to "high" level in the sector to be written in the track to be written, and the magnetic head for advance erase is used for erasing, and the write gate signal is set to "low" level for other sections. As a result, the advance erase magnetic head can be used for tracking.

However, when formatting is performed only by writing an identification signal in the 11) area, from one index signal to the next index signal, that is, until the disk rotates once,
The write gate signal becomes "high" continuously. In this case, when the write game 1 signal is in a "high" state, it is a writing state, and the advance erasing magnetic head can only be used for erasing. Therefore, during formatting, the pre-erase magnetic head cannot perform tracking. Therefore, even if the pre-erase magnetic head is used for tracking servo, a dedicated tracking servo magnetic head (5) is used for tracking servo only during formatting. ) had to be provided.

[Means for Solving the Problems] This invention provides a recording/reproducing magnetic head (7), an erasing magnetic head (8) which precedes this, and a method for writing an identification signal into at least the identification signal area during formatting. During formatting, the tracking servo signal is not captured in the identification signal area, and the tracking servo signal is read from the erasing magnetic head (8) in an area other than the identification signal area. A means of importing and performing tracking servo (
15) (16).

(Operation) At the time of formatting, a tracking servo signal is captured in the data area section of each sector, and tracking servo is performed using the advance erase magnetic head based on this tracking servo signal.

(Embodiment) FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a timing chart for explaining the example in FIG.

In FIG. 1, (14) is a write gate signal generation circuit. This write gate signal generation circuit (14) includes:
A write mode signal, a takeover mode signal and a format mode signal are provided. This write gate signal generation circuit (14) becomes a "high" level when a write mode signal and a format mode signal are supplied, and becomes a "low" level when a read mode signal is supplied.
Generates a light signal that becomes the level. Now, the format mode signal is supplied to the write gate signal generation circuit (14), and the recording/reproducing magnetic head (7) writes the ID area section of each sector of each track! Consider the case of formatting to record a D-fold signal.

In this case, a write gate signal at a "high" level is supplied to the erase/tracking changeover switch (10). Then, the changeover switch (10) becomes the erase signal generation circuit (13) side, as shown in the figure. Then, the erasing signal is supplied from the erasing signal generating circuit (13) to the preceding erasing magnetic head (8) via the changeover switch (10).
) performs the erasing operation.

In this case, the write gate signal at the "high" level is also supplied to the gate circuit (9). Then, this gate circuit (9) supplies the ID data supplied through the input terminal (20) to the recording/reproducing magnetic head (7). And each ID data! Recorded in area D.

Next, tracking servo during this formant will be explained.

(15) is a muting signal generation circuit.

This muting signal generation circuit (15) is enabled only in the format mode. This muting signal generation circuit (15) has an input terminal (20
), and a muting signal that is high level from the end of the ID data, that is, from the start of the data area to the end of the data area, is obtained and supplied to the base of the transistor (16).

Then, the transistor (16) turns on, and the output terminal of the write gate signal generation circuit (14) becomes the transistor (16).
16) and is grounded through the emitter.

Also, at this time, erase/tracking selector switch (
The input terminal of the write gate signal of 10) also goes to "low" level, and this erase/tracking selector switch (10)
) is switched from the erase signal generation circuit (13) side to the data reproduction circuit (11) side. Then, the tracking servo signal recorded on the disk is supplied to the tracking servo circuit (12) via the advance erase magnetic head (8), the changeover switch (10), and the data reproducing circuit (11). Then, tracking is performed by a tracking servo circuit (12) in each data area section.

Note that the tracking servo may be performed in the ID area section by sampling and holding tracking errors in the data area section, or the tracking servo may be turned off in the ID area section and turned on in the data area section. You can do it like this.

In the illustrated example, when the transistor (16) is turned on, the gate circuit (9) is turned off.
) may be configured such that, for example, the write gate signal is turned on when it is at a "high" level and turned off when it is at a "low" level.

FIG. 3 is a diagram showing an example of the miniting signal generating circuit (15). In the example in FIG. 3, a pattern that does not occur at the end of the ID data as data indicating the end of the ID data is in the minting signal generation circuit (15).
).

In the same figure, (21) detects a format mode signal during formatting, and a flip-flop circuit (18) detects a format mode signal during formatting.
) is a format mode detection circuit that makes it possible to set. (17) is a pattern detection circuit to which ID data is supplied and detects the end pattern of the ID data described above. When the pattern detection circuit (17) detects the end pattern of the ID data, it supplies a detection signal to the set terminal S of the flip-flop circuit (18). Therefore,
At the time of formatting, the flip-flop circuit (18) is set by this detection signal, and supplies a muting signal having a "high" level to the base of the transistor (16). When a muting signal is applied to the pace of transistor (16), tracking is initiated as described above. Flip-flop circuit (18)
The output signal of is also supplied to the enable terminal of the counter (19), and the count becomes 5JT@ from the time of setting. This counter (19) supplies a signal that becomes "1" when it counts the number of clock pulses corresponding to the data area section to the reset terminal R of the flip-flop circuit (18).

Then, the output of the flip-flop circuit (18) becomes low level. In other words, the miniting signal becomes low level, and the acquisition of the tracking signal is turned off.

Examples of the present invention include the following in addition to the gA1 diagram example 0.

In other words, by using a hard disk controller such as ADAPTEC's AlC-010, which can control the write gate signal using a method such as a program, the write gate signal is set to a high level in the ID area and a low level in the data area. If programmed, tracking servo can be performed using the advance erase magnetic head even during formatting in the same manner as described above.

If you use a hard disk controller like the one mentioned above,
The minting signal generating circuit (15) and transistor (16) in the example of FIG. 1 can be omitted.

In addition, regarding the detection of the end of the it) area, 11) If the number of signal bits is fixed and there is no change, by counting this 1D times the number of signal bits,
The end of the ID area may also be detected.

〔Effect of the invention〕

According to this invention, during formatting, a tracking signal is captured in the area section of each sector, and tracking is performed in the data area section. This has the effect of allowing kink servo to be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a timing diagram of the signal in the example shown in FIG. 1, FIG. 3 is a diagram showing an example of muting signal generation times WRn, and FIG. The explanatory diagram, FIG. 5, does not show the disk format of the magnetic disk 2 device. (7) is a recording/reproducing magnetic head, (8) is a pre-erase magnetic head, (10) is an erase/tracking switch, (14) is a write gate signal generation circuit, (1
5) is a muting signal generation circuit, and (16) is a transistor.

Claims (1)

[Scope of Claims] It has a magnetic head for recording or reproducing and a magnetic head for erasing which precedes it, and performs recording and reproducing in units of sectors including an identification signal area and a data area, and In a magnetic recording/reproducing device that also uses a magnetic head for track servo, at least the identification signal area at the time of formatting is
A means for writing an identification signal; and a means for writing an identification signal; during formatting, a tracking servo signal is not captured in the identification signal area, and a track servo signal is captured from the erase magnetic head in an area other than the identification signal area; A magnetic recording/reproducing device comprising means for performing tracking servo by performing tracking servo.