Tri-bit encoding for disk drive servo track ID information

Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form

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360 48, 360 49, 360 7780, G11B 509, G11B 5596

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active

056004990

ABSTRACT:
A format for embedded servo track identification fields in rotating disk data storage units such as magnetic disk drives. The present invention uses the concept of tri-bits (i.e., three code bits per logical bit) to encode track identification information in servo wedges of embedded servo disk drive systems. More specifically, two particular sets (and their equivalents) of tri-bit codes have been discovered to have optimum characteristics for providing a phase coherent encoding of a Gray code that is simple to translate into straight binary code. The properties of such tri-bit encoding limit error propagation to a single bit, which allows for very reliable track identification during movement of a head transducer across tracks (i.e., "seeks"). A full range of Gray scale codes is available since more than two consecutive logical "0"s can be reliably decoded when encoded using such tri-bits. The properties of such tri-bit encoding also allow for relatively high servo channel rates, which results in a reduction in servo field length. Accordingly, a counter-intuitive result of increasing the length of the encoding symbols for track identification fields is to decrease the overall length of the servo field, thereby permitting an increase in areal density.

REFERENCES:
patent: 4553131 (1985-11-01), Endoh
patent: 4912467 (1990-03-01), Whitfield et al.
patent: 5170299 (1992-12-01), Moon
"Modulation and Coding for Information Storage" Siegel et al., Dec. 1991, pp. 68-86, IEEE Communications Magazine.

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