Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2011-07-19
2011-07-19
Sniezek, Andrew L (Department: 2627)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S025000, C360S075000
Reexamination Certificate
active
07982987
ABSTRACT:
A method and apparatus for detecting predetermined surface characteristics in head gimbal assemblies to improve hard disk drive reliability. The predetermined surface characteristics include head slider protrusions such as scratches or contamination that can cause damage to the head or disk in hard drives. By detecting these protrusions, those drives with an increased chance of failure can be removed from a test group, thereby increasing the quality and reliability of the remaining disk drives. The invention provides a method of detecting these protrusions that is a more practical option than using a scanning electron microscope (SEM) to inspect each head slider.
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Deng Youping
Simmons Randall G.
Tang Wing T.
Yang Huiping
Hitachi Global Storage Technologies - Netherlands B.V.
Patterson & Sheridan LLP
Sniezek Andrew L
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