Appeal No. 2000-0379
Application No. 08/815,352
The following example, taken from page 5 of the specification,
demonstrates how errors during read-out of the data sync mark
and preceding (i.e., preamble) bits can result in false
detection of the data sync mark:
Line 27 shows the sync word pattern, which occupies bit
positions -08 to -00. Line 28 shows the sync word pattern
preceded by the expected "1" bits in bit positions -11 to -09.
Lines 29 and 30 show that if read errors occur in bit
positions -11 and -04, the bits in positions -11 to -03 of the
read-out signal will be incorrectly detected to be the sync
word pattern. In order to reduce the chance of such an
occurrence, Appellant uses a data sync mark write string which
-3-
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