Servo track address channel code for PR4 magnetic recording

Details Servo track address channel code for PR4 magnetic recording Servo track address channel code for PR4 magnetic recording

1995-03-31

1998-04-07

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

360 40, 341 59, 341 97, H03M 700, H03M 704, G11B 509

Patent

active

057371423

ABSTRACT:
A rate 5/7, d=0 channel code encodes a Gray code servo track address into channel data recorded on a magnetic disk; a PR4 sliding threshold Viterbi sequence detector detects the recorded servo track address upon read back; a cost effective d=0 decoder decodes the recorded servo track address into its Gray code representation; and a 1/1+D filter decodes the Gray code track address into its binary representation. Detecting the servo data with a PR4 Viterbi sequence detector, which is already provided in a read channel for detecting user data, increases the data density of the storage system. The cost and complexity of the decoder is reduced by encoding/decoding the Gray code track address in sections of five bits.

REFERENCES:
patent: 5274510 (1993-12-01), Sugita et al.
patent: 5327400 (1994-07-01), Fredrickson et al.
patent: 5384671 (1995-01-01), Fisher
Siegel et al., "Modulation and Coding for Information Storage", IEEE Communications Magazine, Dec. 1991.

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