Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2005-02-08
2005-02-08
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S075000, C324S210000
Reexamination Certificate
active
06853508
ABSTRACT:
The present invention provides a method and apparatus for detecting the presence of contaminants on the slider of a disk drive. By detecting the rate of change of the resistance of a thin film coil of a disk drive write element during drive operation, it can be determined if a foreign material is present on the coil. Nominal resistance change values for write elements of a disk drive are determined at manufacturing time, and are stored within the disk drive. During later operational use, the resistance change for the coil of the write elements is measured and compared with the stored nominal resistance change values. If the difference between the stored nominal resistance values and the measured resistance change values exceeds a predetermined threshold, the drive is presumed to have contaminants on the slider.
REFERENCES:
patent: 20020097513 (2002-07-01), Ng et al.
IBM Technical Disclosure Bulletin, “Thermal Heating of Slider Trailing Edge to Remove Contamination”, G. J. Smith, vol. 40 No. 7 Jul. 1997.
Bracewell & Patterson LLP
Hitachi Global Storage Technologies - Netherlands B.V.
Sniezek Andrew L.
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