JPH11259999A - Magnetic disk device and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk device capable of preventing the contact of a magnetic head with the data area of the magnetic disk and the adsorption of the magnetic head on the data area of the magnetic disk when the magnetic head is brought into contact with the magnetic disk and fixed. SOLUTION: A magnetic disk 1 is provided with a contact/start/stop(CSS) area having a pattern 13 formed for position detection, and a data area 12. A writing signal is written in the pattern 13 for position detection. A magnetic head 3 is mounted on the tip of a carriage 4, and the carriage 4 is rotated around a rotary shaft 4a by a voice coil motor 5. The magnetic head 3 is moved onto the CSS area 11, the writing signal of the pattern 13 for position detection is read, and accordingly the pattern 13 for position detection is detected. Then, the rotary-driving of the magnetic disk 1 by a motor is stopped, a projected part 4a is pressed to an inner peripheral stopper pin 7 by a locking means 6, and thus the carriage 4 is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic disk drive, and more particularly, to a magnetic disk drive using a zone texture medium as a magnetic disk and having a lock mechanism for fixing a magnetic head when the magnetic disk is stopped.

[0002]

2. Description of the Related Art In a conventional magnetic disk drive, a CSS is used to prevent the magnetic disk from being damaged when the rotation of the magnetic disk as a recording medium is started or stopped.
(Contact start / stop) method is adopted. The magnetic disk of the CSS-type magnetic disk device has a CSS area on the innermost circumference of the magnetic disk, which is inside the data area where actual data is written.

In a magnetic disk drive, a magnetic head is mounted on a carriage, and the magnetic head is biased by the carriage or the like in a direction toward the magnetic disk.
Thus, when the magnetic disk is stopped, such as when the power is off, the magnetic head is in contact with the magnetic disk in the CSS area. The magnetic disk is rotated by rotation driving means provided in the magnetic disk device. When the power of the magnetic disk device is turned on and the rotational speed of the magnetic disk is increased by the rotation driving means, the magnetic head floats from the magnetic disk by air pressure. Thereafter, the magnetic head moves toward the data area of the magnetic disk.

If the magnetic disk drive is turned off and the magnetic head is not fixed and the magnetic disk drive is vibrated due to an impact or the like, the magnetic head moves and the magnetic disk is moved. Surface may be scratched. For this reason, in the conventional magnetic disk device, when the magnetic disk is stopped, the magnetic head is fixed with the magnetic head in contact with the magnetic disk. The magnetic head is mounted on a mounting section provided on the carriage, and the magnetic head is fixed by fixing the carriage by a lock mechanism.
As a lock mechanism for fixing the carriage, a mechanism using a magnetic force of a magnet or a mechanism for mechanically locking the carriage is used. The mechanism that mechanically locks the carriage is less likely to release the lock mechanism due to vibration applied to the magnetic disk device from outside the magnetic disk device than using the magnetic force of a magnet.

[0005] The magnetic disk drive is provided with a carriage driving means such as a voice coil motor for moving the mounting portion of the carriage in the radial direction of the magnetic disk.
The magnetic head mounted on the mounting portion of the carriage moves in the radial direction of the magnetic disk by the carriage driving means. Then, when the rotation of the magnetic disk is stopped in order to turn off the power of the magnetic disk device, a constant current is applied to a voice coil motor for moving the magnetic head so that the magnetic head is arranged on the CSS area. Then, a part of the carriage is pressed against the stopper. After that, the rotation of the magnetic disk is stopped by stopping the driving of the rotation driving means, and the carriage is fixed by the lock mechanism.

As a magnetic disk, a disk whose data area is mirror-finished, such as a zone texture medium, is usually used. In this case, if the magnetic head is brought into contact with the data area of the magnetic disk when the magnetic disk is stopped, the magnetic head may be attracted to the magnetic disk. Therefore, the magnetic disk is provided with a CSS area having a roughened surface or a laser dot pattern formed thereon so that the magnetic head does not stick to the magnetic disk.

A conventional magnetic disk drive is disclosed in Japanese Patent Application Laid-Open No. 2-103774. In the magnetic disk drive, the CSS of the magnetic disk
A write signal is written in the area as a position detection pattern. When the magnetic head reads the write signal in the CSS area, the discriminator discriminates the data read by the magnetic head, and the write signal in the CSS area is detected by the discriminator. If the signal level of the read signal exceeds the preset range when reading the write signal in the CSS area, an abnormality is reported outside the magnetic disk device.

[0008]

As described above, in the conventional magnetic disk drive, when the carriage on which the magnetic head is mounted is fixed by the lock mechanism, the magnetic head is brought into contact with the CSS area of the magnetic disk. However,
In a conventional magnetic disk device such as that disclosed in Japanese Patent Application Laid-Open No. 2-103774, a constant current is applied to a voice coil motor for moving a magnetic head, so that a part of the carriage is pressed against a stopper, and then the carriage is moved. The carriage has been fixed by a lock mechanism without being aware that the magnetic head is on the CSS area. Therefore, when the magnetic head is fixed by the lock mechanism, the magnetic head does not normally move to the CSS area due to a malfunction of the voice coil motor or the like. For example, the lock mechanism may operate when the magnetic head is on the data area. There is a problem. In this case, the magnetic head comes into contact with the data area of the magnetic disk, and the surface of the data area is damaged. Further, since the surface of the data area of the magnetic disk is mirror-finished, if the magnetic head is fixed in a state where the magnetic area is in contact with the data area, the magnetic head is attracted to the magnetic disk.

SUMMARY OF THE INVENTION It is an object of the present invention to fix a magnetic head by bringing the magnetic head into contact with the magnetic disk so that the magnetic head contacts the data area of the magnetic disk and damages the data area, An object of the present invention is to provide a magnetic disk drive in which a magnetic head does not stick to an area or the like.

[0010]

In order to achieve the above object, the present invention provides a CSS having a position detecting pattern formed thereon.
A magnetic disk having an area and a data area in which data is written, rotation driving means for rotating the magnetic disk, a magnetic head for reading a position detection pattern of at least a CSS area of the magnetic disk, and a mounting on which the magnetic head is mounted A carriage for urging the magnetic head in a direction toward the magnetic disk, a carriage driving means for moving a mounting portion of the carriage in a radial direction of the magnetic disk, and a magnetic head when the magnetic disk stops. A lock mechanism for fixing the carriage in contact with the CSS area of the magnetic disk, a determination unit for determining data read by the magnetic head and detecting a position detection pattern in the CSS area, and a rotation driving unit And a control unit for controlling the carriage driving unit After the determination unit detects the position detection pattern, the control unit controls the rotation drive unit and the lock mechanism so that the rotation drive unit stops the rotation of the magnetic disk and the lock mechanism fixes the carriage. Features.

In the above invention, after the discriminating unit detects the position detection pattern formed in the CSS area, the rotation drive of the magnetic disk is stopped, and the carriage is fixed by the lock mechanism. The control unit controls the rotation driving unit and the lock mechanism, and before the lock mechanism fixes the carriage, the discriminating unit detects the position detection pattern in the CSS area. It is confirmed that there is. Accordingly, when the magnetic head mounted on the mounting portion of the carriage is not moved to the CSS area due to, for example, malfunction of the carriage driving means, and the magnetic head is located on the data area where data is written, the magnetic driving by the rotation driving means is performed. The rotation drive of the disk stops,
The lock mechanism does not operate. Therefore, the magnetic head is prevented from contacting the data area of the magnetic disk, and the data area of the magnetic disk is not damaged. In addition, since the carriage is prevented from being fixed by the lock mechanism while the magnetic head is in contact with the data area of the magnetic disk, the magnetic head does not stick to the data area of the magnetic disk.

Preferably, the CSS region has a predetermined surface roughness or a laser dot pattern. This prevents the magnetic head from sticking to the CSS area of the magnetic disk when the magnetic head is brought into contact with the CSS area of the magnetic disk and the carriage is fixed by the lock mechanism.

Further, a position information pattern for positioning the magnetic head is formed in the data area of the magnetic disk, and the position detection pattern is different from the position information pattern. Thus, the position detection pattern 13 can be detected by the magnetic head without positioning the magnetic head.

Further, the present invention provides a magnetic disk having a CSS area in which a position detection pattern is formed and a data area in which data is written, a rotation driving means for rotating the magnetic disk, and at least a CSS of the magnetic disk.
A magnetic head that reads a pattern for detecting the position of a region, a carriage that has a mounting portion on which the magnetic head is mounted, and biases the magnetic head in a direction toward the magnetic disk;
A carriage driving means for moving a mounting portion of the carriage in a radial direction of the magnetic disk, a lock mechanism for fixing the carriage in a state where the magnetic head is in contact with a CSS area of the magnetic disk when the magnetic disk is stopped, and a magnetic head A discriminating unit for discriminating the data read by the discriminating unit and detecting the position detecting pattern in the CSS area, wherein the discriminating unit detects the position detecting pattern and then detects the position detecting pattern. The rotation drive means and the lock mechanism are controlled so that the rotation drive of the magnetic disk is stopped and the carriage is fixed by the lock mechanism.

In the above invention, the discrimination unit detects the position detection pattern in the CSS area before the lock mechanism fixes the carriage, as in the above-described invention of the magnetic disk drive, so that the magnetic head can be used for the magnetic disk drive. It is confirmed that it is on the CSS area of. Therefore, in such a method of controlling a magnetic disk drive, when the magnetic head is brought into contact with the magnetic disk and the magnetic head is fixed, the magnetic head may come into contact with the data area of the magnetic disk and damage the data area. Absent. Further, since the magnetic head is not fixed by bringing the magnetic head into contact with the mirror-finished data area of the magnetic disk, the magnetic head is prevented from sticking to the data area of the magnetic disk.

[0016]

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

FIG. 1 is a schematic configuration diagram showing a magnetic disk drive of one embodiment of the present invention. In the magnetic disk drive of the present embodiment, as shown in FIG. 1, a magnetic disk 1 is rotatably supported by a spindle 2 inside a main body case 9. The main body case 9 is provided with a motor (not shown) as a rotation driving means for rotating the spindle 2. When the spindle 2 is rotated by the motor, the magnetic disk 1 supported by the spindle 2 is rotated.
Rotates about the rotation axis of the spindle 2. The inner circumference of the magnetic disk 1 is a CSS (contact start / stop) area 11. In the CSS area 11, a position detection pattern 13 is formed. CSS area 1
Reference numeral 1 denotes an area where the magnetic head 3 contacts when the rotation of the magnetic disk 1 is stopped, such as when the power of the magnetic disk device is turned off. For this reason, the magnetic head 3
When the magnetic head 3 comes into contact with the area 11,
The CSS region 11 has a predetermined surface roughness or a laser dot pattern so as not to be attracted to the surface. The portion of the magnetic disk 1 from the outside of the CSS area 11 to the periphery is a data area 12 in which actual data is written. A zone texture medium is used as the magnetic disk 1, and the surface of the data area 12 is mirror-finished. In the data area 12, a position information pattern for positioning a magnetic head described later is formed.

The position detection pattern 13 formed in the CSS area 11 is different from the position information pattern in the data area 12. Thus, the position detection pattern 13 can be detected by the magnetic head without positioning the magnetic head. When the CSS area 11 has a laser dot pattern and the position detection pattern 13 is the same as the position information pattern in the data area 12, a phenomenon such as a decrease in signal level due to the laser dot pattern occurs. It becomes difficult to read the position detection pattern 13.

A carriage 4 is supported inside the main body case 9 so as to be rotatable about a rotation shaft 4a.
The rotation axis 4a is parallel to the rotation axis of the spindle 2 and perpendicular to the plane of FIG. The carriage 4
The carriage 4 extends from the rotation shaft 4 a toward the magnetic disk 1, and the leading end of the carriage 4 is a mounting portion on which the magnetic head 3 is mounted. The magnetic head 3 is urged by the carriage 4 in a direction toward the magnetic disk 1. The urging force of the carriage 4 causes the magnetic head 3 to contact the magnetic disk 1 when the magnetic disk 1 stops. A voice coil motor 5 as a carriage driving means is mounted on the rotating shaft 4a on the side opposite to the magnetic disk 1 side. An end of the carriage 4 opposite to the magnetic head 3 side is attached to a movable portion of the voice coil motor 5, and the carriage 4 is rotated by the voice coil motor 5 about a rotation shaft 4 a. Thereby, the magnetic head 3 mounted on the mounting portion of the carriage 4 is moved in the radial direction of the magnetic disk 1. Data area 12 of magnetic disk 1
A servo pattern 14 is formed in the data area 12 of the magnetic disk 1 in order to perform automatic positioning of the carriage 4 above.

A projection 4a protrudes from a part of the movable portion of the voice coil motor 5. An inner peripheral stopper pin 7 and an outer peripheral stopper pin 8 for restricting the movement of the projection 4a are attached to a portion inside the main body case 9 near the projection 4a at a distance from each other. The protrusion 4a moves between the inner peripheral stopper pin 7 and the outer peripheral stopper pin 8. Further, the inner peripheral stopper pin 7 inside the main body case 9 is formed.
A lock means 6 is provided near the outer peripheral stopper pin 8. When the rotation of the magnetic disk 1 is stopped, the locking means 6 presses the protrusion 4 a against the inner peripheral stopper pin 7 with the magnetic head 3 in contact with the CSS area 11 of the magnetic disk 1 to fix the protrusion 4 a. Things.
The carriage 4 and the magnetic head 3 are mechanically fixed by fixing the projection 4a by the locking means 6 and the inner peripheral stopper pin 7 in this manner. Therefore,
The lock means 6 and the inner peripheral stopper pin 7 constitute a lock mechanism for fixing the carriage 4.

When the rotation of the magnetic disk 1 is stopped, for example, when the power of the magnetic disk device is turned off, the protrusion 4a comes into contact with the inner peripheral stopper pin 7, and the magnetic head 3 is moved to the CSS area of the magnetic disk 1. 11 is in contact.
When the power of the magnetic disk drive is turned on, the locking means 6
Is released, and the magnetic disk 1 is rotated by the motor. The magnetic head 3 flies above the magnetic disk 1 due to the air pressure generated as the magnetic disk 1 rotates. Then, the voice coil motor 5 is driven to move the movable portion of the voice coil motor 5 so that the protrusion 4a moves in the direction from the inner peripheral stopper pin 7 to the outer peripheral stopper pin 8. As a result, the carriage 4 rotates about the rotation shaft 4a, and the magnetic head 3 moves from the CSS area 11 to the data area 12 toward the edge of the magnetic disk 1. The magnetic head 3 is arranged on the edge of the magnetic disk 1 in a state where the protrusion 4 a is in contact with the outer peripheral stopper pin 8.

Further, the magnetic disk drive of the present embodiment is provided with a discriminator (not shown) and a controller (not shown). The determination unit is for determining the data read by the magnetic head 3 and detecting the position detection pattern 13 of the CSS area 11. The control unit includes a motor for rotating the spindle 2, a voice coil motor 5,
It controls the lock means 6 and the like.

FIG. 2 shows the C of the magnetic disk 1 shown in FIG.
FIG. 3 is a diagram showing a write signal written to a position detection pattern 13 in an SS area 11. FIG. 3 is a diagram showing the write timing of the write signal shown in FIG. CSS
The write signal written to the position detection pattern 13 in the area 11 has a single frequency as shown in FIG. As shown in FIG. 3, such a single-frequency write signal is written in the position detection pattern 13 by a write gate having a timing such that three cycles are formed in one round of the magnetic disk 1. The write timing pattern is sent and written in the CSS area 11 at a half of the track pitch of the data track to form the position detection pattern 13. In the present embodiment, the write signal is written by the write gate at a timing such that three cycles are provided in one round of the magnetic disk 1, but the write signal may be written by a write gate having another cycle different from the three cycles.

FIG. 4 is a diagram showing a reproduced signal obtained when the write signal of the CSS area 11 described with reference to FIGS. 2 and 3 is reproduced. By moving the magnetic head 3 over the CSS area 11 and reproducing the write signal of the position detection pattern 13 without positioning the magnetic head 3 at this time, as shown in FIG. By rotation, a reproduced signal having the same waveform is obtained every three periods.

In the magnetic disk drive as described above, when the rotation of the magnetic disk 1 is stopped, the voice coil motor 5 is moved so that the magnetic head 3 mounted on the mounting portion of the carriage 4 moves toward the CSS area 11. Is controlled by the control unit. Then, the magnetic head 3 is moved to the CSS area 1
1, and the magnetic head 3 reads the write signal of the position detection pattern 13 in the CSS area 11, thereby obtaining the reproduction signal shown in FIG. 4. The position detection pattern 13 is detected by the determination unit determining that the reproduced signal is that of the position detection pattern 13. Thereafter, in response to the detection of the position detection pattern 13 by the determination unit, the control unit stops the motor for rotating the spindle 2 and drives the lock mechanism 6. In this state, the projection 4a is in contact with the inner peripheral stopper pin 7, and the locking mechanism 6
a is pressed against the inner peripheral stopper pin 7 and
Is fixed. Thus, while the magnetic head 3 is in contact with the CSS area 11 of the magnetic disk 1, the movable portion of the voice coil motor 5, the carriage 4, and the magnetic head 3 are fixed and the magnetic disk 1 stops.

Therefore, in the magnetic disk drive of the present embodiment, before the magnetic head 3 is brought into contact with the magnetic disk 1 and the carriage 4 is fixed by the locking means 6, it is confirmed that the magnetic head 3 is on the CSS area 11. Therefore, the magnetic head 3 does not come into contact with the magnetic disk 1 before the magnetic head 3 moves to the CSS area 11 due to malfunction of the voice coil motor 5 or the like. Therefore,
The magnetic head 3 does not come into contact with the data area 12 of the magnetic head 3, thereby preventing the data area 12 from being damaged by the magnetic head 3 touching the data area 12.
Further, the magnetic head 3 is moved to the data area 12 of the magnetic disk 1.
The magnetic head 3 is prevented from being attracted to the magnetic disk 1 because the carriage 4 is not fixed in contact with the magnetic disk 1. In addition, in order to move the magnetic head 3 onto the CSS area 11, data for automatic control is written into the CSS area 11, and the magnetic head 3 is automatically controlled using the control unit of the magnetic disk drive. 11 does not need to be moved.

In the magnetic disk drive of the present embodiment described above, the SCC area 11 is formed on the inner circumference of the magnetic disk 1, but the position detecting pattern 13 is formed on the outer circumference of the magnetic disk 1 instead of the inner circumference. An SCC region having the same pattern as described above may be formed. In addition, although the lock means 6 is configured to mechanically fix the carriage 4, a lock mechanism using magnetic force may be used as the lock mechanism for fixing the carriage 4.

[0028]

As described above, according to the present invention, after the discriminator detects the position detection pattern formed in the CSS area of the magnetic disk, the rotation of the magnetic disk by the rotation driving means is stopped and the lock is stopped. Since the rotation driving means and the lock mechanism are controlled so as to fix the carriage by the mechanism, it is confirmed that the magnetic head is on the CSS area of the magnetic disk before the lock mechanism fixes the carriage. Therefore, the magnetic head does not contact the data area of the magnetic disk to damage the data area, and the magnetic head does not stick to the data area, so that a highly reliable magnetic disk apparatus can be obtained. is there. Further, after the position of the magnetic head is confirmed without automatically moving the magnetic head over the CSS area of the magnetic disk, the magnetic head can be brought into contact with the CSS area to fix the magnetic head.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a magnetic disk drive of one embodiment of the present invention.

FIG. 2 is a diagram showing a write signal written to a position detection pattern 13 in a CSS area of the magnetic disk shown in FIG.

FIG. 3 is a diagram showing a write timing of a write signal shown in FIG. 2;

FIG. 4 is a diagram showing a reproduced signal obtained when reproducing the write signal in the CSS area 11 described with reference to FIGS. 2 and 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk 2 Spindle 3 Magnetic head 4 Carriage 4a Rotating shaft 5 Voice coil motor 6 Lock mechanism 6a Stopper 7 Inner peripheral stopper pin 8 Outer peripheral stopper pin 9 Body case 11 CSS area 12 Data area 13 Position detection pattern 14 Servo pattern

Claims (7)

[Claims] 1. A CSS in which a position detection pattern is formed.
A magnetic disk having an area and a data area in which data is written, rotation driving means for rotating the magnetic disk, a magnetic head for reading a position detection pattern of at least the CSS area of the magnetic disk, A carriage having a mounting portion mounted thereon for urging the magnetic head in a direction toward the magnetic disk; a carriage driving means for moving the mounting portion of the carriage in a radial direction of the magnetic disk; A lock mechanism for fixing the carriage in a state where the magnetic head is in contact with the CSS area of the magnetic disk when the magnetic disk is stopped;
A magnetic disk drive comprising: a determination unit for detecting the position detection pattern in the SS area; and a control unit for controlling the rotation drive unit and the carriage drive unit, wherein the determination unit determines the position detection pattern. After detecting,
The magnetic disk, wherein the control unit controls the rotation drive unit and the lock mechanism so that the rotation drive unit stops rotating the magnetic disk and the lock mechanism fixes the carriage. apparatus. 2. The magnetic disk drive according to claim 1, wherein the CSS area has a predetermined surface roughness or a laser dot pattern. 3. In the data area of the magnetic disk,
3. The magnetic disk drive according to claim 1, wherein a position information pattern for positioning the magnetic head is formed, and the position detection pattern is different from the position information pattern. 4. The lock mechanism according to claim 1, wherein said lock mechanism mechanically fixes said carriage.
The magnetic disk drive according to any one of the above. 5. The magnetic disk drive according to claim 1, wherein the lock mechanism uses a magnetic force to fix the carriage. 6. The magnetic disk drive according to claim 1, wherein the magnetic disk is a zone texture medium in which at least a surface of the data area of the magnetic disk is mirror-finished. 7. A CSS on which a position detection pattern is formed.
A magnetic disk having an area and a data area in which data is written, rotation driving means for rotating the magnetic disk, a magnetic head for reading a position detection pattern of at least the CSS area of the magnetic disk, A carriage having a mounting portion mounted thereon for urging the magnetic head in a direction toward the magnetic disk; a carriage driving means for moving the mounting portion of the carriage in a radial direction of the magnetic disk; A lock mechanism for fixing the carriage in a state where the magnetic head is in contact with the CSS area of the magnetic disk when the magnetic disk is stopped;
A control method for a magnetic disk drive, comprising: a determination unit for detecting the position detection pattern in the SS area; wherein the determination unit detects the position detection pattern,
A method of controlling a magnetic disk device, comprising: stopping the rotation of the magnetic disk by the rotation drive unit and controlling the rotation drive unit and the lock mechanism such that the carriage is fixed by the lock mechanism. .