International Business Machines Corporation

Shigemi Suganuma

Yuji Yokoe

Kazunari Tsuchimoto

Kayo Takahashi

A data storage system, a storage medium and a method of controlling a data storage system are described, which allow defects on a storage medium to be handled with a memory region of a reduced size. In one embodiment defective sectors are determined on a magnetic disk and recorded in a defect map as a starting address and a number (length) of consecutive defective sectors to more efficiently record defective sector bursts than in the prior art. Optionally a mixed format defect map may record defective sector bursts as above and single sector defects as an address without a number of consecutive defective sectors.

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Campbell, CA, United States of America

Shigemi Suganuma