Appeal No. 2000-0379
Application No. 08/815,352
The invention relates to the format of the data sync mark
in a disk drive system. Specification Figure 3B, reproduced
in part
below, shows a data sector 92a which includes: (a) a constant-
frequency, AGC bit stream 96a for enabling an AGC circuit to
establish a desired signal level before detection of the data
sync mark, DSM 100a; (b) a sequence of PLL bits 98a having
sufficient consecutive flux reversals to permit phase
synchr on-ization
before detection of
the data sync
mark; (c) the data
sync mark 100a;
(d) user data
94a; and (e) optional data fields 101a and 106a (Specification
at 25, l. 27 to p. 26, l. 19).
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