Appeal No. 2000-0379
Application No. 08/815,352
is an ordered set of m expected symbols selected to have the
maximum distance from all non-mark substrings of m consecutive
expected symbols that exist in the concatenated string of
expected symbols formed by the preamble write string and data
sync mark string.
B. The claims
Claim 1, the sole independent claim, reads as follows:
1. A disk drive having a pattern detector for providing
fault-tolerant detection of a data sync mark represented by a
substring of a concatenated string of error-prone read symbols
and for providing a reduced risk of detection error, the disk
drive comprising:
a disk having a plurality of track segments;
write means having an input for receiving bits;
means operative during a first operation for supplying a
sequence of write bits that are received at the input of the
write means;
the sequence of write bits defining a preamble write
string, a data sync mark write string, and a user data write
string;
the preamble write string and the data sync mark write
string corresponding to a concatenated string of expected
symbols;
the write means having means responsive to each write bit
received at the input of the write means for magnetically
defining a respective bit cell of a sequence of bit cells
along a track segment;
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