JPH04137278A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain improvement in stability of a read system by using a recording medium recorded with a servo data in such a manner as a track width gradually expands toward an inner peripheral side, securing a sufficient track width on the inner peripheral side where recording density is high and reducing the influence of a crosstalk. CONSTITUTION:The recording medium 11 recorded with the servo data in such a manner as the track width gradually expands toward the inner peripheral side is used. That is, a hook 14 is positioned at a prescribed position A1 by a linear stage 15, and in this condition the servo data is written on a disk 11 via a magnetic head 12. After that, the linear stage 15 is moved in a straight line to the direction of an arrow A and at a predetermined constant interval, and while the hook 14 is positioned sequentially as B1, C1 ..., the servo data is written on the disk 11. Thus, on the inner peripheral side where the recording density is high, the sufficient track width is obtained, the influence of the crosstalk is reduced, and the improvement in the stability of the read system is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic recording/reproducing device such as a hard disk drive (HDD) used as a data recording device of a computer or the like.

(Prior Art) Conventionally, in a hard disk drive that is equipped with one magnetic head per disk surface, which is a recording medium, both servo data, which is positioning control information of the magnetic head, and normal glue read/write data are The track width was uniform for all cylinders.

(Problems to be Solved by the Invention) In recent years, magnetic recording and reproducing devices have become smaller and have larger capacities, and their recording densities have become dramatically higher.

Under such circumstances, there is a problem that the influence of crosstalk becomes large, especially on the inner circumferential side where the recording density is high (when the data transfer rate is constant), and the read system becomes unstable.

The present invention was made in view of the above points, and aims to improve read system stability by ensuring a sufficient track width on the inner circumferential side where recording density is high, reducing the influence of crosstalk. The purpose of the present invention is to provide a magnetic recording/reproducing device that can perform the following functions.

[Configuration of the Invention (Means and Effects for Solving the Problems) The magnetic recording/reproducing device according to the present invention uses a recording medium on which servo data is recorded so that the track width gradually spreads toward the inner circumference. It is characterized by recording/reproducing data.

The present invention also provides a recording medium, a magnetic head for writing/writing data to the recording medium, and a magnetic head that supports the magnetic head and rotates about a predetermined axis to move the magnetic head to the recording medium. an actuator for moving in the radial direction of the
The actuator is provided on the side opposite to the magnetic head across the fulcrum of the actuator, so that the track width of servo data recorded on the recording medium by the magnetic head gradually expands toward the inner circumference of the recording medium. and a linear stage for rotating the actuator to perform servo writing.

According to such a configuration, a sufficient track width can be ensured on the inner circumferential side where the recording density is high, and the influence of crosstalk can be reduced and the stability of the read system can be improved.

(Embodiment) Hereinafter, a magnetic recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a servo write mechanism in, for example, a hard disk drive (HDD).

In FIG. 1, the magnetic head 12 is connected to an actuator 13.
The rotation of the actuator 13 moves the disk 11 in the radial direction to read/write data. The actuator 13 is a rotary type actuator that uses a spindle motor (not shown) as a driving source and rotates around an axis indicated by point 0 as a fulcrum.

In this embodiment, a hook 14 is provided on the opposite side of the magnetic head 12 across the fulcrum (point O) of the actuator 13, and this hook 14 is attached to the linear stage 15.
The actuator 13 is positioned by pushing it in the direction of the arrow A. In this case, for example, by passing a minute drive current through the voice coil motor, a force in the opposite direction to the pressing direction of the linear stage 15 is generated, and the hook 14 is pressed against the linear stage 15. The actuator 13 can be positioned reliably.

Next, an operation procedure for writing servo data of the width increasing type in the inner circumferential direction using the servo write mechanism configured as described above will be described.

First, the hook 14 is positioned at the position indicated by Al by the linear stage 15, and in this state, servo data is written on the disk 11 through the magnetic head 12. After that, the linear stage 15 is moved at a preset constant interval (
OB2-B2 C2-C2B2...) to move the hook 14 linearly in the direction of arrow A.

Servo data is written to the disk 11 while sequentially positioning CI, DI, and so on.

Here, if we look at the relationship between the servo writing radius and the amount of movement of the linear stage 15 using FIG. 1 as an example, it will be as follows.

When the hook 14 moves from Al to B1, the moving amount S of the linear stage 15 can be expressed as S-tan(,4A10BI).

Therefore, if the distance between the hook 14 and the fulcrum of the actuator 13 is 1, ZAI OBI is ZAI 0BI-
arctan (s/1)-/A30B3...
・(1) becomes. Further, if the distance between the rotation center of the disk 11 and the fulcrum of the actuator 13 is n (OP), the distance between the magnetic head 12 and the fulcrum of the actuator 13 is m1, and the initial writing radius is rO, then tPOA3 is ZPOA3-a
rccos (K/2/m/n) where K-m2
+n2-ro 2 (2). Therefore, the writing radius r when the hook 14 is positioned at B is: r=rr+2+n2-2XmXn 2-2X (ZPOB3) =m2+n2-2XmXn 2-2X (ZPOA3 +fA30B3)...(
3) It becomes. According to the above equations (1), (2), and (3), the writing radius r becomes a function of the movement amount S of the linear stage 15. FIG. 2 shows the relationship between the moving amount S of the linear stage 15 and the writing radius r when the parameters rO, 1, m, and n are determined as follows.

O-22 From FIG. 2, it can be seen that the amount of change in the writing radius r relative to the amount of change in the movement MS of the linear stage 15 gradually decreases from the inner circumference to the outer circumference of the disk 11. Note that the dotted line in the figure indicates the case where the amount of change in the writing radius r is constant.

In this way, by moving the linear stage 15 at equal intervals, it is possible to easily write servo data of a type in which the width gradually increases in the inner circumferential direction.

Figure 3 shows servo data and lead/read data in the same embodiment.
FIG. 3 is a diagram showing a recording state of write data.

During servo writing, the magnetic head 12 is forcibly positioned as shown on the left side of FIG. This results in
Inner circumference width gradually increasing type servo data that gradually expands in the inner circumferential direction of the disk 11 is written (a<b<c<
a<e<f...). Further, after servo writing, the magnetic head 12 is positioned based on the servo data as shown on the right side of FIG.

Therefore, normal read/write data is also stored on disk 1.
It gradually spreads towards the inner circumference of 1 (α>β...)
. As a result, the recording density on the inner peripheral side can be lowered, the influence of crosstalk can be reduced, and the stability of the read system can be improved.

Although the above embodiment has been explained using a hard disk device as an example, the present invention is not limited to this, but can also be applied to a servo write such as a floppy disk device (FDD). Further, if the movement of the linear stage 15 is not limited to equal intervals but is made variable, the track width can be changed at various ratios.

[Effects of the Invention] As described above, according to the present invention, it is possible to easily write servo data of the type in which the width gradually increases in the inner circumferential direction, in which the track width gradually increases toward the inner circumference. Therefore, a sufficient track width can be secured on the inner circumferential side where the recording density is high.
It is possible to improve lead system stability by reducing the influence of crosstalk.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of a servo write mechanism according to an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between the movement amount of the linear stage and the writing radius in the same embodiment, and Fig. 3 is a diagram showing the same embodiment. FIG. 7 is a diagram showing a recording state of servo data and read/write data in an example. 11...Disk, 12...Magnetic helad, 13...Actuator, 14...Hook, 15...Linear stage.

Claims (2)

[Claims] (1) A magnetic recording and reproducing device that records/reproduces data using a recording medium on which servo data is recorded so that the track width gradually increases toward the inner circumference. (2) a recording medium; a magnetic head that reads/writes data to the recording medium; and a magnetic head that supports the magnetic head and rotates about a predetermined axis to move the magnetic head in the radial direction of the recording medium. an actuator to be moved; and an actuator provided on the opposite side of the magnetic head across the fulcrum of the actuator, the track width of servo data recorded on the recording medium by the magnetic head gradually moving toward the inner circumferential side of the recording medium. A magnetic recording/reproducing device characterized in that it performs servo writing, comprising a linear stage that rotates the actuator so that the actuator spreads out.