KR870005371A - Disk storage - Google Patents

Abstract

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Description

Disk storage

Since this is an open matter, no full text was included.

2 is a side view showing the configuration of a magnetic disk device according to one embodiment of the present invention.

3 is a block diagram showing an example of the configuration of the control circuit shown in FIG.

4A shows an example of servo information.

* Explanation of symbols for the main parts of the drawings

10: disk 11: in turn 12: datahead

13: servohead 14: carriage 15: data surface

20: calibration servo 21: calibration servo head

32: position signal generating circuit 33,73: adder

34: position control circuit 42: position displacement detection circuit

44: correction value calculation circuit 52: data or information generating circuit

62,63: sector

Claims (12)

A plurality of first servo surfaces 11 on which the servo information is recorded, a second servo surface 20 on which the servo information for correction is recorded, and a data surface 15 on which data is read / written; A disc-shaped recording medium 10; A first servo head (13) for reading servo information recorded on the first servo surface; A second servo head 21 for reading servo information recorded on the second servo surface; A data head (12) for writing data on the data surface and reading data on the data surface; A head driving means 14 fixed to the head to integrally drive the head; The second servo head relative to the first servo head based on the servo information read out by the first servo head and correction servo information read out by the second servo head; The position displacement amount σ on the disk surface of the head to be accessed with respect to the first servo head of the head to be accessed based on the calculated position displacement amount δ of the second servo head, Means for obtaining; Controlling the driving means to reduce the off-track amount of the access head by the servo information from the first servo head and the position displacement amount σ of the access head obtained by the means for obtaining the position displacement amount. A disk storage device, characterized by comprising control means. A disk storage apparatus according to claim 1, wherein said disk-shaped shape recording medium is a magnetic disk. A disk storage apparatus according to claim 1, wherein said disk-shaped recording medium is an optical disk. The apparatus according to claim 1, wherein the means for obtaining the displacement amount? On the disk surface of the access head relative to the first servo head is: The first servo head 13 is positioned on an arbitrary servo track on the first servo surface 11 and according to correction servo information read by the second servo head. Means for obtaining a positional displacement amount δ on the disk surface of the first servohead 13 and the second servohead 21; The position displacement amount δ of the second servo head, the distance X between the first servo surface and the second servo surface, and the disk surface 20 or 15 accessed with the first servo surface 11. And means for obtaining a displacement amount (?) On the disk surface of the head to be accessed with respect to the first servo head of the head to be accessed. 2. The apparatus according to claim 1, wherein the means for obtaining a position displacement amount? On the disk surface of the access head relative to the first servo head, Means for aligning the first servo head (13) to any servo track on the first servo surface (11); Means for obtaining the positional displacement amount δ on the disk surface of the second servo head 21 with respect to the first servo head 13 based on the correction servo information read out from the second servo head 13. and; The displacement amount δ, the distance X between the first and second servo surfaces, and the distance Y between the first and second servo surfaces 11 and the disk surface 20 or 15 to be accessed. And means for obtaining a displacement amount (?) Of the disk faceting with respect to said first servo head of the data head being accessed. The method of claim 1, Means for obtaining a displacement amount 6 on the disk surface of the access head relative to the first servo head, Means for obtaining an off-track amount (δ1) of the first servo head based on the servo information from the first servo head (13); Means for obtaining an off-track amount (δ2) of the second servo head based on the information in the second servo head (21); The disc of the second Sungbo head relative to the first servo head by adding the off track amount δ 1 of the first servo head and the off track amount δ 2 of the second servo head. Means for obtaining an on-plane positional displacement amount δ; Of the head accessed in a similar relationship between the positional displacement amount δ and the distance X between the first and second servo surfaces, and the distance Y between the first and second servo surfaces. And means for obtaining a positional displacement amount [sigma] with respect to the first servo head. The method of claim 1, wherein the control means, Means for outputting a correction signal for correcting the positional displacement based on an amount of positional displacement on the disk surface of the access head relative to the first servohead; Means for outputting a position signal corresponding to a position displacement of the servo head in accordance with the servo information from the first servo head; And means for driving the head for access by adding the correction signal and the position signal, and controlling the driving means so that the sum of both is at " 0 " level. The method of claim 1, wherein the control means, Based on the positional displacement amount of the access head, when the access head is displaced on the inner circumferential side of the disk with respect to the first servohead, a position based on the servo information obtained from the first servohead On the outer peripheral surface side of the position displacement amount, when the access head is displaced on the outer peripheral surface side of the disk with respect to the first servo head, the position is more than the position based on the servo information obtained from the first servo head. And a means for controlling the drive means to be positioned on the inner peripheral surface side of the displacement amount. The method of claim 1, The second servo has an area in which the correction servo information is recorded and a data area in which data is read / written; And the second servo head reads out the correction servo information, reads data into the data area, and reads data from the data area. The correction servo information is recorded in at least one correction servo track of the second servo surface. Means for obtaining the position displacement amount Means for positioning the second servo head on the correction servo track; In the state where the first servo track is positioned on the servo track, the second servo head is connected to the first servo head based on the correction servo information from the second servo head. And a means for obtaining a displacement amount on the disk surface. The correction servo information is recorded in at least one sector of the second servo surface. Means for obtaining the position displacement amount And the position displacement amount is obtained based on correction servo information read out intermittently from the second sub head. The method of claim 1, The means for calculating the position displacement amount obtains the position displacement amount on the disk surface of the second servo head relative to the first servo head at a predetermined time elapses, and maintains the value until the next measurement. And the position displacement amount on the disk surface of the access head relative to the first servo head. ※ Note: The disclosure is based on the initial application.