Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2011-07-19
2011-07-19
Mercedes, Dismery E (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S031000, C360S059000, C360S067000, C360S068000
Reexamination Certificate
active
07982991
ABSTRACT:
Embodiments of the present invention help to efficiently determine the appropriate setting of the write current of a magnetic head relative to temperature. According to one embodiment, a test computer determines the set value of a write current as a function of temperature for each head device portion from the relationship between a write current and an error rate. A test execution controller sets a selected head device portion and a write current to an AE, and writes data on a magnetic disk using the components in a HDD. The test execution controller reads the written data, and the error rate of the data from an error correcting section. The test execution controller repeats the same process with the write current varied. Upon completion of the measurement at the preset write currents, the test execution controller transfers the measurement data to the test computer.
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Masuda Hiroyasu
Matsuda Kouji
Noda Junzoh
Shimizu Masahiro
Tobari Atsushi
Hitachi Global Storage Technologies - Netherlands B.V.
Mercedes Dismery E
Patterson & Sheridan LLP
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