JP2642475B2 - Disk drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for writing sector servo information in a hard disk device that performs sector servo using a voice coil motor for head driving.

[Conventional technology]

There are various types of storage devices such as computers,
There is a hard disk device characterized by a large storage capacity, quick access, and small size. In this hard disk drive, a magnetic disk having a magnetic recording layer formed on the surface of a hard disk made of aluminum or the like as a disk is rotated at a high speed (for example, about 2,600 rotations), and magnetic heads are formed on the surface of the magnetic disk at minute intervals. Recording / reproducing is performed in a state of being close to (for example, 0.2 to 0.5 microns).

FIG. 2 shows an example of this type of disk device. In FIG. 2, a magnetic head 2 is provided so as to access each of the front and back surfaces of a plurality of magnetic disks 1 for recording information. Each of the magnetic disks 1 rotates integrally with a direct drive motor (hereinafter referred to as a DD motor) 3 as a drive source. The number of the magnetic heads 2 is usually twice as many as the number of the magnetic disks 1, each of which is integrally mounted on the swing arm 4 and further connected to the voice coil motor connected to the swing arm 4. (Voice Coil Motor, hereinafter referred to as VCM) 5 allows the magnetic disk 1 to move in the radial direction.

Each of the magnetic heads 2 is connected to a head amplifier 6 to amplify recording information from the drive circuit 8 and amplify servo information and the like from the magnetic head 2. In addition, a servo circuit 7 for performing servo control of the VCM 5 using the servo information and a rotation of each of the DD motor 3 / VCM 5 and a head amplifier 6
Is provided with a drive circuit 8 for transmitting and receiving signals to and from the device. Here, the servo circuit 7 controls the drive circuit 8. The drive circuit 8 is provided with a controller 9 for controlling the drive circuit 8 and enabling transmission and reception of data from the magnetic head 2. The controller 9 is connected to an external host computer via a signal line 12. 11 is connected. The inside of the chain line frame consisting of the above-mentioned member numbers 1 to 9 constitutes an embedded type (a type in which a controller is integrated with the disk device) hard disk device.

FIG. 3 is a perspective view showing details of the structure of the embedded hard disk device 10. As shown in FIG.

As shown in FIG. 3, the magnetic heads 2 are arranged so that each pair of heads faces each other across the surfaces of a plurality (for example, two) of magnetic disks 1, and swings outside the magnetic disks 1. A head drive mechanism 13 for driving the arm 4 is provided. The DD motor 3, the swing arm 4, the VCM, and the head drive mechanism 13 are mounted on a base plate 14 serving as a base of a housing for holding each member in a sealed state from the outside.

A printed circuit board (not shown) on which a motor drive circuit, a control circuit, and the like are mounted is attached to the base plate 14. The head drive mechanism 13 includes a swing arm 4, a yoke 15 that holds a magnet (not shown) and rotatably supports the swing arm 4, and a coil that is held by the swing arm 4 and movably disposed in the yoke 15. 16, bearing part 17 for supporting swing arm 4, this bearing part
A shaft 18, which is made rotatable and fixed to the base plate 14,
The swing arm 4 includes a regulating arm 19 having one end connected to the swing arm 4 for holding the FPC, and a solenoid 20 for engaging the other end of the regulating arm 19 according to an operation mode to regulate the rotation of the swing arm 4.

A housing for accommodating each of the above members includes a base plate 14 and a top cover (not shown), and a gasket is used for a contact portion between the base plate 14 and the top cover and a mounting portion of the VCM 5 in order to maintain confidentiality. 2 shown in FIG.
The shaft portion of the DD motor 3 is filled with a magnetic fluid.

Next, the operation of the hard disk device having the above configuration will be described.

This type of disk drive device has a recording track in advance.
When the excitation condition of the VCM 5 includes the CPU, it is stored in a memory (not shown) in the controller 9 so that the magnetic head 2 can be positioned according to the driving state of the VCM 5. Therefore, when driving, the host computer
The drive circuit 8 selects one of the recording tracks to be recorded or reproduced in accordance with a command from 11. In the process of tracking this recording track, when the gap of the magnetic head 2 is positioned in the servo sector, a pair of servo signals formed in a zigzag pattern on the magnetic disk 1 are read. The read servo signal is amplified by the head amplifier 6, and the drive circuit 8 controls the VCM 5 based on the servo signal output from the head amplifier 6 to move the magnetic head 2 in the radial direction of the magnetic disk 1. . By this control, the gap of the magnetic head 2 is positioned on the center of the track width of the recording track. Thereafter, the VCM 5 is driven every time a servo signal is detected, and the magnetic head 2 is always positioned on the track, so that data can be read or written stably.

VCM5 has the advantage that the mass of the movable part is small and the guide mechanism is simple, so it can be manufactured at a small size and at low cost.
In the future, it will tend to be used instead of the conventionally used stepping motor.

By the way, in the case of hard data, expansion and contraction due to heat is apt to occur, and servo stability is inferior to floppy disks. Therefore, a sector servo that obtains servo information for each sector and performs head control while performing servo control finely. The method is adopted.

In a disk manufacturer, the servo information is written and shipped. Conventionally, the writing method is as shown in FIG.

For example, two discs have four sides # 0 to # 3,
If one rotation is composed of two sectors, after writing servo information SI of # 0 for two sectors, and after elapse of the holding time WT, a verify eye process for confirming whether or not the written information has been normally written is performed. The writing of the first surface is completed. Subsequently, servo information SI for two sectors is written to the second surface # 1 (that is, the back surface of # 0), and the hold time WT is set in the same manner as described above, and then the verify eye process is performed.
Thereafter, by repeating the same processing sequentially up to # 3,
That is, by repeating time T _{1 to} T ₂ four times,
Writing of the servo information to each of the four surfaces is completed.

[Problems to be solved by the invention]

However, in the conventional method of writing sector servo information, a great deal of time is required for writing since servo information is written and verified for each disk surface. For example, when there are four disks, the time required for writing (W) and verify (V) the servo information of one cylinder is as follows.

4 (the number of heads) × 1 (the number of rotations) × 2 (W / V) +1 (the number of rotations [W → V]) = 9 (the number of rotations) As described above, a great amount of time (for example, 20 minutes) is required to write the servo information. , Which hinders the improvement of disk productivity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for writing sector servo information which can solve such a problem of the prior art and can reduce the time for writing servo information.

[Means for solving the abstract]

In order to achieve the above object, the present invention relates to a disk drive device comprising a disk and a magnetic head for writing and / or reading information on and from each side of the disk, and positioning the magnetic head at a track position on the disk by sector servo. Then, between adjacent servo information to be written in the servo area of each sector on the first surface of the disk, the servo information is sequentially written at predetermined intervals for each surface over the entire surface after the second surface. And a means for outputting an external index signal over a pre-recording area of servo information to be written in the servo area of one preset sector.

(Operation)

According to the above means, the heads corresponding to the respective surfaces of the disk for one cylinder are switched and driven, and the response servo information is continuously written on the respective surfaces, and the verify is performed without providing a waiting time. Therefore, the data for one cylinder is collectively written, and the time required for writing can be greatly reduced.

Further, since the index signal is applied to each servo information in the same sector, the index does not shift.

Furthermore, since the index signal covers the servo information on each surface, data cannot be written while the index signal is being output. It can be prevented from being written.

〔Example〕

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

FIG. 1 is an explanatory diagram showing an arrangement and writing method of servo information according to the present invention.

FIG. 1 exemplifies a case where there are two disks and one rotation consists of two sectors, as in the case of FIG. In the present invention, first, servo information of # 0
The SI is written in the first sector, and then the head corresponding to # 1 is driven by the controller 9 to write the servo information SI in the first sector on the # 1 surface. Similarly, # 2 surface and # 3
Servo information that sequentially drives and responds to the head corresponding to the surface
Write SI. These writes are the second of # 0
Processing is performed so as to end all before writing to the sector starts. Therefore, when the number of sectors is large, it is necessary to shorten the interval as long as the servo information SI does not overlap each other.

Servo information SI for each of the first sectors of one cylinder
Is completed, verify whether or not the subsequently written information has been written in a desired state. Subsequent to the end of the verification, writing of the servo information SI to the second sector is performed. This writing is the first
This is the same as in the case of the sector, and is sequentially performed on # 0 to # 3, and subsequently verify is performed.

According to the present invention, no waiting time is required when moving from write to verify. Therefore, the time required for the processing is as follows.

1 (W) × 1 (V) = 2 (rotation) As a result, the writing time per disk device is greatly reduced, the use efficiency of the writing device is increased, and the productivity of the disk device can be improved. .

As described above, in the present invention, since the positions of the servo information of # 0 to # 3 are recorded with a shift, the index is
What is necessary is just to provide so that it may cover the length of the recording width of the servo information of # 0 to # 3. By doing so, it is possible to prevent the index from being distorted. this is,
Only the external index may be used, and the first sector after the index is the first sector. The external index is obtained from the rotation of the motor using a magnet or the like (not shown), and is output from the CPU in the drive circuit based on the internal index.

〔The invention's effect〕

As described above, according to the present invention, the index signal is provided so as to cover the entire recording area (width) of the servo information for one sector. To get an index. Also, since the index signal covers the servo information of each surface, it is possible to use this to avoid writing data while the index signal is output, and to write the data that should be written avoiding the servo information. Can be prevented from being written on the servo information due to a malfunction and disappearing in the servo information.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a method of writing servo information according to the present invention, FIG. 2 is a block diagram showing an example of a hard disk device, and FIG. 3 is an embedded hard disk device 10.
FIG. 4 is an explanatory view showing a conventional method for writing servo information to a disk. 1 ... magnetic disk, 2 ... magnetic head, 7 ... servo circuit, 8 ... drive circuit, 9 ... controller, 10 ... hard disk device, 11 ... host computer, SI ...
Servo information.

Claims (1)

(57) [Claims] 1. A disk drive device comprising a disk and a magnetic head for writing and / or reading information on and from each side of the disk, wherein the magnetic head is positioned at a track position on the disk by sector servo. Between adjacent servo information to be written in the servo area of each sector, the servo information is sequentially shifted at predetermined intervals for each surface with respect to the entire surface after the second surface, and A disk drive device comprising: means for outputting an external index signal over the entire recording area of servo information to be written to the servo area of one preset sector.