Method for verifying servo data

Details Method for verifying servo data Method for verifying servo data

1983-04-21

1985-05-07

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Checking record characteristics or modifying recording...

360 27, 360 77, 360 31, G11B 502

Patent

active

045161623

ABSTRACT:
A method is disclosed for verifying the integrity of servo data stored as a series of parallel servo tracks on a disk. Each track includes automatic gain control data and servo positioning data. The peak amplitudes of the automatic gain control pulses on a first track determine a first effective threshold or AGC gain level. The first threshold level is then shifted to a higher, enhanced threshold level. Servo data pulses from a second track are then detected, based on the enhanced threshold level and the AGC gain level of the first track. Should these servo data pulses not be fully detected, an error is recorded for the second servo track.

REFERENCES:
patent: 3506814 (1970-04-01), MacDonald et al.
patent: 3864741 (1975-02-01), Schwarz
patent: 4214280 (1980-07-01), Halfhill et al.
patent: 4285015 (1981-08-01), Rose et al.
IBM TDB vol. 14, No. 9, "Checking the Quality of Magnetic Recording Tape", Fraim et al., 2/72, pp. 2629-2630.
YIBM TDB vol. 14, No. 9, "Total Surface Magnetic Tape Test", Barth, 2/72, pp. 2637-2638.
IBM TDB vol. 22, No. 8A, "Recording Position Signals on Record Disk", Brock et al., 1/80, pp. 3127-3130.

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