Servo control system using a varying frequency servo pattern for

Details Servo control system using a varying frequency servo pattern for Servo control system using a varying frequency servo pattern for

1985-03-18

1986-05-13

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, G11B 555, G11B 556

Patent

active

045890374

ABSTRACT:
An improved magnetic recording disk drive, in particular a flexible disk drive, includes a head positioning servo system which utilizes servo information recorded on the disk by the disk drive. The servo information is located within one of the data sectors and is in the form of a pattern of radially spaced-apart segments, each segment overlapping a number of data tracks and comprising magnetic transitions which increase in frequency in the radial direction to provide a digital head position error signal (PES). A similar segment is located in each of the other data sectors around the perimeter of the disk to provide track profile information so that the head positioning system can compensate for disk runout and distortion. The disk drive includes means for eliminating the effect of the amplitude of the readback signal from the servo and profile segments on the head positioning system, thus assuring a reliable PES at all radial locations on the disk and allowing interchangeability of disks among disk drives.

REFERENCES:
patent: 3812533 (1974-05-01), Kimura et al.
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4188646 (1980-02-01), Sordello et al.
patent: 4346413 (1982-08-01), Hack
patent: 4348703 (1982-09-01), Janosi
patent: 4396959 (1983-08-01), Harrison et al.
patent: 4488187 (1984-12-01), Alaimo
IBM Journal of Research and Development, Nov. 1974, "Design of a Disk File Head-Positioning Servo", pp. 506-512, R. K. Oswald.

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