Method and apparatus for recording servo synchronization informa

Details Method and apparatus for recording servo synchronization informa Method and apparatus for recording servo synchronization informa

1986-10-14

1989-04-25

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360135, G11B 582, G11B 2110

Patent

active

048253103

ABSTRACT:
A servo system for flexible magnetic disks such that the synchronization pulses do not have to be perfectly aligned. The disk is encoded such that consecutive servo tracks alternate between having a synchronization and an alternate synchronization mark. Four pulses represent a synchronization mark and two pulses represent an alternate synchronization mark. The alternate synchronization marks are off-set from the synchronization marks by a certain distance, such that they do not interfere with each other when a transducer head located between the servo tracks reads them. The disk drive system will read and identify the synchronization marks or alternate synchronization marks and start generating timing signals as appropriate. The servo bursts in the servo sector can then be read.

REFERENCES:
patent: 4297737 (1981-10-01), Andresen et al.
patent: 4400747 (1983-08-01), Siverling
patent: 4424543 (1984-01-01), Lewis et al.
patent: 4462053 (1984-07-01), Lum et al.
patent: 4472750 (1984-09-01), Klumpp et al.

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