Raymond H Hurst

US Patent:

58673415, Feb 2, 1999

Filed:

Jan 30, 1996

Appl. No.:

8/594114

Inventors:

LeRoy A. Volz - Northridge CA
Stephen R. Manz - Canoga Park CA
Raymond E. Hurst - Palmdale CA

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

G11B 5596

US Classification:

360 7708

Abstract:

A method and apparatus determining head position of a data transducer head relative to a selected one track of a multiplicity of concentric tracks within a magnetic/disc drive is provided. At least one prerecorded servo sector within a data track includes four time staggered servo bursts. The first pair and second pair of servo bursts are radially offset from each other by generally a burst width such that an edge from each of the pair are substantially co-linear in forming a track null. The first pair is radially offset from the second pair by one-half of the burst width. The first pair is read to determine a first relative amplitude therebetween, and the second pair is read to determine a second relative amplitude therebetween. Additionally, the radially offset and time staggered servo bursts prerecorded on the servo sector can be of varying width and numbered to create the plurality of track nulls within a data track about which the head can be positioned.