G - Physics – 11 – B
Patent
G - Physics
11
B
352/19.4, 352/19
G11B 27/30 (2006.01) G11B 5/09 (2006.01) G11B 20/10 (2006.01) G11B 20/12 (2006.01) H04L 7/04 (2006.01)
Patent
CA 1326293
Abstract of the Disclosure The location of the sequence of data bits stored on a storage medium is identified by generating a predetermined synchronization bit sequence; storing on the storage medium a bit sequence corresponding to the predetermined synchronization sequence to indicate the location of the data bit sequence; deriving from the stored corresponding bit sequence on the storage medium a trial sequence; and determining whether the trial sequence corresponds to the predetrmined synchronization sequence by determining the number of symbols in which the trial sequence differs from the predetermined synchronization sequence, each symbol comprising a plurality of bits, whereby the effect of clustered bit errors is reduced. The stored data bits are encoded from raw data bits in accordance with a code in which raw data symbols are encoded as data bit groups of at least two different lengths; a bit sequence corresponding to the synchronization sequence is stored on the medium as an indication of the location of the stored data bits; and the synchronization sequence comprises a sequence of raw data symbols which encode as stored encoded groups all of a single length, whereby error propagation is reduced.
587551
Quantum Corporation
Smart & Biggar
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