Multiple servo track types using multiple frequency servo patter

Details Multiple servo track types using multiple frequency servo patter Multiple servo track types using multiple frequency servo patter

1997-08-07

2000-03-07

Edun, Muhammad

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, 360 7706, 360 75, G11B 5596

Patent

active

060348356

ABSTRACT:
A magnetic disk storage system uses multiple-frequency position error sensing (PES) patterns and produces track identification information from the PES signal by detecting changes in relative servo pattern bursts of the multiple-frequency servo pattern. The number of tracks that can be identified with a multiple frequency, dual burst servo pattern is defined by each unique combination of servo pattern bursts. The system can provide accurate track-to-track position control even without gray code information, so long as timing marks or other orienting position information is available. A quad burst servo pattern is used for greater numbers of track types by selecting two dual burst patterns with different numbers of identified track types. The track types formed by such an arrangement consist of one track type from the first of the dual burst patterns and another track type from the second of the dual burst patterns, such that the total number of track types is the product of the number of track types from both dual burst patterns.

REFERENCES:
patent: 5602692 (1997-02-01), Freitas et al.
patent: 5615065 (1997-03-01), Cheung
patent: 5818659 (1998-10-01), Cheung et al.
C.H. Bajorek, E. Harden and N.J. Mazzeo, "Large Surface Air Bearing for a Flexible Disc File", IBM TDB, vol. 18, No. 11, Apr. 1976, 3859-60.
M. Barlow, M.A. Church, R.E. Jones, Jr. and T.H. Yeh, "Thin Film Magnetic Head Assembly", IBM TDB, vol. 24, No. 4, Sep. 1981, 1912-13.
D.M. Jones. "Parallel Servo-Track Write and Read Verification with Side-By-Side Inductive Head Elements", IBM TDB, vol. 26, No. 8, Jan. 1984, 4243-44.

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