Qlogic Corporation

Stanley K Cheong

Gregory T Elkins

Daniel R Pinvidic

In a disk drive, a disk drive controller circuit and method keep track of defective and/or undesired sectors on a disk and skip such defective or undesired sectors during a read or write operation requested by a host system. A microprocessor is programmed to respond to a read or write command from the host system by converting a list of sectors to be skipped to an address and range format suitable for loading a set of registers within the controller circuit. The microprocessor loads the set of registers, and the controller circuit compares each sector identified by the read or write command with the contents of the set of registers. If a sector identified by the read or write command matches one of the sectors to be skipped, the controller circuit skips that sector during the read or write operation.

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Los Angeles, CA, United States of America

Stanley K Cheong