JPS6332705A - Disk driving device - Google Patents

Abstract

PURPOSE:To record and erase information, by moving a magnetic head onto a disk of a recording medium by a prescribed track width and a prescribed track pitch, by a control means. CONSTITUTION:In accordance with an instruction and information from a main system, a control part 1 detects 7 a position of the outermost periphery tack 00 of a disk, detects 8 an index hole, detects 9 a write inhibiting state, drives 4 the disk by referring to them, moves 5 a head in the diameter direction, loads the head onto the disk, and allows the head 3 to write, read and erase through an R/W circuit 2. When a write command of a head positioning signal is received, the control part 1 allows the head to write after all the information of the disk is erased. At the time of erasing, an ordinal number of the track is counted by a counter 10 in the control part. The head 3 is positioned to the outside by 1/2 of a track pitch P from the outermost periphery track 00, moves by P/2 each and erases. P is smaller than a track width T and both sides of adjacent erasion tracks S are superposed, therefore, there is no erasion remainder.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a disk drive that moves a head over a disk of a recording medium to record and erase information on the disk with a predetermined track width and a predetermined track pitch. It is related to the device.

[Prior Art] As this type of disk drive device, there is a magnetic disk drive device. In other words, this device rotates a magnetic disk, moves a magnetic head along the radial direction of the magnetic disk, and records, reproduces, or erases information on the magnetic disk with a predetermined track width and a predetermined track pitch. I am doing it.

In recent years, in magnetic disk drive devices, a configuration has been developed in which the positioning of a magnetic head is controlled via servo signals for magnetic head positioning control recorded on both sides of a track of a magnetic disk. This is to control the positioning of the magnetic head with high accuracy in accordance with the increase in recording density.

The servo signal is written to the magnetic disk after all recorded information on the magnetic disk is erased before formatting the magnetic disk. This writing has conventionally been performed using a dedicated writing device.

[Problems to be Solved by the Invention] By the way, when considering a configuration in which the above-mentioned servo signal writing is performed by the magnetic disk drive device itself without using a dedicated device, there is no problem with the writing itself, but before that, there is no problem. There are the following problems with erasing data.

In other words, in magnetic disk drives that control head positioning using servo signals, the tunnel erasing method is not normally adopted in order to increase the recording density, and the track width is narrower than the track pitch, so erasing is performed at the regular track pitch. Even if this is done, parts that cannot be completely erased remain on the magnetic disk.If unerased parts remain, this may cause deterioration of servo signals and recorded data that will be written later.

[Means for Solving the Problems] In order to solve the above-mentioned problems, according to the present invention, a recording head is moved over a disk of a recording medium to record information on the disk at a predetermined track width and a predetermined track pitch. In the disk drive apparatus for performing recording, there is provided a control means for causing the head to erase recorded information on the disk at a track pitch narrower than the track width.

[Operation J] According to such a configuration, when erasing is performed before recording a servo signal/signal, by performing erasing at a track pitch narrower than the track width, no unerased portion is generated, and complete erasure can be performed.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the attached drawings.

Above the eaves m FIG. 1 is a block diagram schematically showing the configuration of one embodiment of a magnetic disk drive device employing the present invention.

In FIG. 1, the reference numeral 1 indicates a control section that controls the entire apparatus, and is composed of a microcomputer.

A magnetic head 3 is connected to the control unit 1 via a read/write circuit 2 (not shown) that amplifies a read signal from a magnetic disk, demodulates the read data, modulates and amplifies the write data, and amplifies the erase signal. has been done.

The control unit l also includes a disk drive motor 4, which is a drive source for a disk drive mechanism that rotationally drives a magnetic disk. A stepping motor 5 is a driving source for a head seek mechanism that moves the magnetic head 3 along the radial direction of the magnetic disk, and a head load solenoid 6 is a driving source for a head loading mechanism that loads the magnetic head 3 onto the magnetic disk. They are connected via a driver (not shown).

Furthermore, the control unit 1 includes the outermost track O of the magnetic disk.
A group of sensors are connected, including a track OO detection switch 7 for detecting the position of O, an index detector 8 for detecting an index hole on the magnetic disk, and a write protector sensor 9 for detecting whether the magnetic disk is in a write-protected state. ing.

Under such a configuration, the control unit 1 controls the disk drive motor 4, referring to the outputs of the sensor group, in response to commands and data input from a computer of a host system (not shown).
The stepping motor 5 controls the drive of the head load solenoid 6, and causes the magnetic disk 3 to write, read, or erase data on the magnetic disk via the read/write circuit 2.

By the way, in addition to the configuration similar to the conventional one, this embodiment is configured so that a host system (not shown) can instruct the control unit l to write the servo signal for controlling the positioning of the magnetic head described above. When receiving this command, the control section 1 erases all recorded information on the magnetic disk, and then writes a servo signal.

The details of the operation during this time will be explained below. The positioning of the magnetic head during erasing is performed according to the count of a counter 10 provided in the control section 1 for counting the ordinal number of the track. The counter IO may be provided as hardware or realized by software.

The operation at the time of writing a servo signal is performed as follows according to the control procedure of the control section 1 shown in FIG.

That is, when the control section 1 receives a command to write a servo signal, it executes the routine shown in FIG. 2, and first clears the count N of the counter lO to O in step S1.

Next, in step S2, the magnetic helad 3 is set to N −0,5
Tracks, that is, in the first case, the -0.5 track is used for positioning from the outermost track OO by half a track pitch outward (in the direction of the outer circumference of the disk).

Next, in step S3, one round (or multiple layers) is erased at the position determined in step s2.

Next, the process proceeds to step s4, where it is checked whether the count N has reached the count Nmax+1, which is the ordinal number of the innermost track plus 1.

If it is not Nmax+1, the magnetic head 3 is moved to the N track in step s5. That is, step S3
In the first case, it moves to track 00 half a track pitch inside (in the direction of the inner circumference of the disk) from the position at the time of erasing.

Next, in step S6, one round (or several rounds) of erasing is performed again, and then the counter 10 is incremented in step s7, after which the process returns to step S2 and steps 52 to 52 are performed.
Repeat the loop of S7.

By repeating this process, the magnetic disk 3 is sequentially moved toward the inner circumference of the disk by a half-track pitch, thereby erasing one round (or several rounds).

Then, when erasing is completed to a point half a track pitch inside the innermost track and N=Nmax+1 in step S4 of the loop of steps 52 to S7, step S8
The program branches to , performs a servo signal writing routine, and ends the control. Note that although the servo signal is written in areas on both sides of each track, a description of the writing operation itself will be omitted.

As described above, according to this embodiment, before writing the servo signal, the magnetic head is moved half a pitch at a time from a location half a track pitch outside the outermost track oo to a location half a track pitch inside the innermost track. The track width of a normal magnetic head is l% of the track pitch.
The erase area is set to a certain pitch and is wider than a half-track pitch, so that when erasing is performed sequentially one round or several times, the outer edge of each erase area overlaps the inner edge of the previous outer erase area. Erasing is performed in such a way that no gaps are created between erased areas, and no unerased areas occur.

In other words, according to this embodiment, the servo signal is written after the data has been completely erased without any unerased data.
Deterioration of servo signals and subsequent recorded data caused by unerased data can be reliably prevented.

One week after the first test, the method of erasing and writing servo signals using the configuration shown in Figure 1 is not limited to the above-mentioned method.
As an example, it is also conceivable that the control procedure of the control section 1 as shown in FIG. 3 is used to perform the following operation.

That is, in the first step 521, the counter 1
Clear the 0 count N to 0.

Next, in step S22, the magnetic disk 3 is positioned to the N track, that is, in the first case, the outermost track OO, and one round (or several rounds) of erasing is performed at that position in step S23.

Next, in step S24, it is checked whether N has reached the above-mentioned N wax, and if not, the counter IO is incremented in step S25, and the process returns to step S22, and steps S22 to S25 are repeated as a loop.

As a result, the magnetic head 3 is sequentially moved one track pitch at a time from the outermost track OO to the innermost track, making one revolution (or several revolutions) at each track position.
is erased.

Then, when the erasure of the innermost track is completed and N=N depth in step 324, the process moves to step 526. At this point, as described above, the track width is approximately 1% of the track pitch, so unerased areas remain between the erased areas of adjacent tracks.

At step 326, the counter 10 is set to -0,5.

Next, in step S27, the magnetic head is moved to the N track. That is, in the first case, positioning is performed on the -0.5 track from the outermost track OO to the outside by half a track pitch.

Next, in step 528, erasing is performed for one round (or several rounds) at that position, and then in step S29, a servo signal is written, that is, in the first case, a servo signal is written in the area of tracks -0 and -5.

Next, in step 530, count N is equal to N layer ax +0.5
Check whether it has become, and if not, proceed to step S.
31, the counter 10 is incremented, and step S2
7 and repeat steps 527 to S31 as a loop.

By repeating this, the unerased areas between the tracks are sequentially erased from the outer circumferential side, and servo signals are sequentially written in the areas.

Then, after writing the servo signal to the area half a track inside the innermost track, in step S30, N=
When N wax +0.5 is reached, the control is terminated.

According to the method of first erasing each track, and then writing servo signals while sequentially erasing the areas on both sides of each track (the area between each track), in the case of the first embodiment, Although the order is different, the result is the same, and it is possible to write servo signals by erasing all information previously recorded on the magnetic disk.

11 cusp 1j Furthermore, as a different erasing method before writing the servo signal, the magnetic head is kept in the erase output state and is continuously moved from the outside half track of the outermost track 00 to the inside half track of the innermost track, not in steps. The amount of movement is set to be smaller than the track width per rotation of the magnetic disk.

In this case, the trajectory of the magnetic head on the magnetic disk becomes a spiral shape, and as shown in FIG.
is smaller than the track width T, and adjacent erase tracks S
Since the edges on both sides of the image overlap, it is possible to erase completely without leaving any residue.

Note that the technique described above is applicable not only to magnetic disk drive devices but also to other disk drive devices such as optical disk drive devices when considering writing of the above-mentioned servo signals.

[Effects] As is clear from the above description, the present invention provides a disk drive that moves a recording head over a disk of a recording medium and records information on the disk with a predetermined track width and a predetermined track pitch. The device is equipped with a control means that causes the head to erase recorded information on the disk at a track pitch narrower than the track width, so that the servo is activated after the recorded information on the disk is completely erased without any remaining data. can write the signal,
The excellent effect of avoiding the problems caused by the presence of the unerased material and improving the reliability of the apparatus can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a magnetic disk drive device according to a first embodiment of the present invention, FIG. 2 is a flowchart showing a control procedure when writing a servo signal by the control unit in FIG. 1, and FIG. 4 is a flowchart of a control procedure when writing a servo signal according to the second embodiment, and FIG. 4 is an explanatory diagram of an erase state before writing a servo signal according to the third embodiment. l...Control unit 2...Read/write circuit 3...Magnetic helad 4...Disk drive motor 5...Stepping motor 6...Head rowton lenoid 7...Track 00 detection switch 8... Index detector 9... Write protect sensor 10... Counter

Claims (1)

[Claims] In a disk drive device that moves a recording head over a disk of a recording medium to record information on the disk at a predetermined track width and a predetermined track pitch, the head records information on the disk at a track pitch narrower than the track width. A disk drive device comprising a control means for erasing information.