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Abstract

A disk controller for headerless disk drive system contains a decoder which decodes control words from a data buffer and counts pulses of a byte clock to identify the boundaries of requested data sectors in data frames. To select the control words which correspond to the position of a read/write head relative to media containing the data, the disk controller also contains a programmable alignment processor and an EOS counter that increments in response to EOS pulses generate as the read/write head passes servo sectors. The EOS counter indicates the position of the read/write head by indicating a data frame over which the head is positioned. The alignment processor scans the control words to locate the control word corresponding the data frame indicated by the EOS counter. During the scanning, the alignment processor also aligns logical and physical data sector counters to the position of the read/write head. The disk controller uses the aligned values and begins decoding the control words and controlling data transfer.

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First Claim