Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-12-05
2010-02-16
Kim, Paul D (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603040, C029S603060, C029S603070, C360S031000, C360S053000, C714S044000
Reexamination Certificate
active
07661187
ABSTRACT:
The present invention relates to providing the manufacturing method for a magnetic disk drive that includes the process steps of detecting and processing in a simplified way the defective sectors causing a reading error at low operating environmental temperatures. In one example, defective sectors are detected by read/write testing at high operating environmental temperatures from, for example, 40° C. to 65° C. Reading the data written on the defective sectors makes it obvious that the gain in a high-frequency band is reduced. After test data has been written onto each sector, the filtering coefficient of an FIR element that is set for a data-reading system is changed from the optimum value. The frequency gain is thus reduced. Next, the test data is read and the sectors that have caused a reading error are registered as defectives.
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Nakajima Michio
Taniguchi Masato
Umemura Kaoru
Duncan Patrick
Hitachi Global Storage Technologies - Netherlands B.V.
Kim Paul D
Townsend and Townsend / and Crew LLP
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