JPH0547120A - Hard disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To increase recording capacity of each hard disk by reducing an area required for a servo area of the disk in increasing the area of a data area and correcting misalignment of a servo head to each disk. CONSTITUTION:Servo areas S are provided in two places to be point- symmetrical to a center of each of the disks 11a, 11b and 11c, and the disks 11a and 11b are driven to be rotated under the state of a phase shift of 60 degrees in their servo areas. Moreover, the disk 11c is driven to be rotated under the state of a phase shift of 60 degrees from the disks 11a and 11b in the servo areas S respectively. Consequently, the servo areas S of the individual disks 11a, 11b and 11c are rotated under the state of shifting equally by 60 degrees from each other. By this method, positioning information of either of the disks in the servo areas S is read out by a microcontroller 5 whenever the individual disks 11a, 11b and 11c are rotated by 60 degrees, and based on this, a voice-coil motor 8 is driven, so that the write or read is carried out under the corrected state of misalignment of each servo head 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device using a hard disk as a storage medium. Even in a storage device using a hard disk as a storage medium, in recent years, there has been an increasing demand for faster operation or larger capacity.
It is necessary to improve the recording capacity of the hard disk.

[0002]

2. Description of the Related Art An example of a conventional hard disk recording / reproducing apparatus will be described with reference to FIGS. 4 and 5. For example, three disks 1a, 1b, 1c are rotationally driven at the same center in the hard disk driving apparatus as shown in FIG. Servo heads 2 are provided on the front and back sides of each of the disks 1a, 1b, 1c, respectively, and each servo head 2 is synchronously moved by a voice coil motor 8 described later. Each disc 1a,
Servo areas S at 6 locations are formed in 1b and 1c at equal intervals to store position information of the servo heads 2, and data areas D are formed between the servo areas S, respectively, to write data by the servo heads 2. And a read operation is performed. Then, the disks 1a, 1b, 1c are rotationally driven at the same number of revolutions and with the servo areas S of the disks 1a, 1b, 1c in the same phase.

The writing and reading operations of such a hard disk recording / reproducing apparatus are performed for any one of the disks 1a, 1b, 1c which are rotationally driven in synchronization, and each servo head 2 drives the disks 1a, 1b. , 1c
The position information read from the servo area S of any one of the disks is output to the microcontroller 5 via the position detection circuit 3 and the AD converter 4 as shown in FIG. Based on the above, the voice coil motor 8 which is a head drive motor is driven via the DA converter 6 and the power amplifier 7 to move each servo head 2 to a predetermined position. Then, the data writing or reading operation is performed on the data area D of the disc.

[0004]

In order to increase the recording capacity of the limited data area D of each disk 1a, 1b, 1c in the above hard disk recording / reproducing apparatus, it is necessary to improve the data recording density. It is conceivable that in order to improve the recording density, it is necessary to significantly improve the performance of the peripheral circuits such as the operation speed of the data write circuit and the data read circuit, or the write voltage. There is a problem that it is not easy.

An object of the present invention is to provide a hard disk recording / reproducing apparatus which can increase the recording capacity without increasing the recording density of data on the disk.

[0006]

FIG. 1 illustrates the principle of the present invention. That is, a plurality of recording / reproducing heads 2 for rotating and driving a plurality of hard disks 11 at the same number of revolutions and performing recording / reproducing operations for the respective hard disks 11 are provided, and the recording / reproducing heads 2 are linked by a common head drive motor 8. Servo regions S for detecting the position of the recording / reproducing head are provided on the disk surface of each hard disk 11 at equal intervals in the circumferential direction of the disk surface.
The servo area S read by each of the recording / reproducing heads 2
In the hard disk recording / reproducing apparatus, the control circuit 13 drives the head drive motor 8 based on the position information of the recording / reproducing head 2 to correct the positional deviation of the recording / reproducing head 2 on the disk surface. There is provided a select circuit 12 for sequentially inputting position information read from the servo area S of each hard disk 11 and outputting it as position information of the recording / reproducing head 2 to the control circuit 13.

[0007]

The positional deviation of the recording / reproducing head 2 is detected based on the positional information read from the servo area S of each hard disk 11, and the recording / reproducing is performed by the head drive motor 8 driven by the control circuit 13 based on the information. The displacement of the head 2 is corrected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will now be described with reference to FIG.
And FIG. 3 will be described. The same components as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 3, the disks 11a, 11
Servo areas S are formed at two points b and 11c in a point symmetrical manner with respect to the center of each disk.
In b, the servo area S is rotationally driven with a phase difference of 60 degrees, and the disk 11c is rotationally driven with the servo area S having a phase difference of 60 degrees with respect to 11a and 11c. Therefore, each disk 11a, 11b,
The servo areas S of 11c are rotated with their phases shifted by 60 degrees at equal intervals.

Each such disk 11a, 11b, 1
The output signal of each servo head 2 corresponding to 1c is output to the select circuit 12 as shown in FIG.
The position detection circuit 2 outputs the output signal of one of the servo heads 2 based on the control signal CS of the microcontroller 5.
And through the AD converter 4, the microcontroller 5
Output to. Then, the disks 11a, 11b, 11
When c is rotated in the direction of arrow A shown in FIG. 3, for example,
The microcontroller 5 selects the position information of the servo area S from the servo head 2 corresponding to the disk 11b by the select circuit 12 and outputs it to the position detection circuit 3,
Then, when each of the disks 11a, 11b, 11c is rotated by 60 degrees, the position information of the servo area S from the servo head 2 corresponding to the disk 11a is selected by the select circuit 12 and output to the position detection circuit 3, and then each disk is selected. 11
When a, 11b, and 11c are further rotated by 60 degrees, the servo area S from the servo head 2 corresponding to the disk 11c
The position information of 1 is selected by the select circuit 12 and output to the position detection circuit 3.

As a result, as shown by the dotted line in FIG. 3, position information equivalent to the case where the servo areas S are formed at intervals of 60 degrees on each of the disks 11a, 11b, 11c can be obtained. Therefore, each disk 11a,
The position information of the servo area S of one of the disks is read every time 11b and 11c are rotated by 60 degrees, and the voice coil motor 8 is driven based on the position information to correct the positional deviation of each servo head 2. Then, in this state, the writing or reading operation is performed on any of the disks.

As described above, in this hard disk recording / reproducing apparatus, the area of the servo area 2 of each disk 11a, 11b, 11c is reduced to 1/3 of that of the conventional example while the servo area S of each disk 11a, 11b, 11c is reduced. By reading the position information from, it is possible to obtain the same position information amount as in the conventional example. Therefore, each disk 11a,
The misalignment of the servo head 2 with respect to 11b, 11c can be corrected with the same accuracy as in the conventional example, while the area required for the servo area S in each disk 11a, 11b, 11c is reduced and the area of the data area D is increased. Therefore, the recording capacity of each disk 11a, 11b, 11c can be increased without changing the recording density of data in the data area D.

[0013]

As described in detail above, the present invention can increase the recording capacity without changing the recording density by reducing the area required for the servo area of the hard disk and increasing the area of the data area. Exhibits excellent effects.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram showing an embodiment.

FIG. 3 is an explanatory diagram showing a disc of an embodiment.

FIG. 4 is a block diagram showing a conventional example.

FIG. 5 is an explanatory diagram showing a conventional disc.

[Explanation of symbols]

 2 recording / reproducing head 8 head drive motor 11 hard disk 12 select circuit 13 control circuit S servo area

Claims (1)

[Claims] 1. A plurality of recording / reproducing heads (2) for rotationally driving a plurality of hard disks (11) at the same number of revolutions to perform recording / reproducing operations with respect to each of the hard disks (11), and the recording / reproducing heads (2). 2) is operated in conjunction with a common head drive motor (8), and a servo area (S) for detecting the position of the recording / reproducing head (2) is formed on the disk surface of each hard disk (11). The head drive motor (8) is driven by the control circuit (13) based on the position information of the servo area (S) read by each of the recording / reproducing heads (2) provided at equal intervals in the circumferential direction of the surface. A hard disk recording / reproducing apparatus for correcting the positional deviation of a recording / reproducing head (2) on a disk surface, wherein each hard disk (1) is composed of the plurality of recording / reproducing heads (2). Select circuit to be output to said control circuit (13) to successively input position information read from the servo area (S) as the position information of each recording and reproducing head (2)) of (1
A hard disk recording / reproducing apparatus having the feature 2).