Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Reexamination Certificate
2011-01-04
2011-01-04
Mercedes, Dismery E (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
C360S031000, C360S062000
Reexamination Certificate
active
07864474
ABSTRACT:
Embodiments in accordance with the present invention reduce the number of errors caused by the aged deterioration of a heater for adjusting the clearance between a head and a disk. According to one embodiment, a thermal fly height control (TFC) controller executes the measurement of a resistance value of a heater in a predetermined timing. The TFC controller judges whether or not the measured resistance value falls within a predetermined reference range. If the measured resistance value falls within the reference range, the processing ends without performing any other processing. If the measured resistance value goes out of the reference range, the TFC controller executes error handling processing in response to a resistance failure. As one of the error handling processing, the TFC controller notifies the host that the abnormality (resistance failure) has been detected in the resistance value of the TFC heater.
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Kurita Masayuki
Miyake Kouji
Nagano Yumi
Ohsawa Toyomi
Satoh Noriaki
Brokaw Christopher J.
Hitachi Global Storage Technologies - Netherlands B.V.
Mahamedi Paradice Kreisman LLP
Mercedes Dismery E
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