Method and apparatus for load/unload testing of disk drives
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United States of America Patent
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Feb 17, 2004
Grant Date -
Mar 7, 2002
app pub date -
Jul 27, 2001
filing date -
Aug 3, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides an apparatus (10) and method for monitoring the load/unload process of a head-gimbal assembly (HGA) (14), disk (12) and ramp (16) combination. A ramp strain arm (18) is used to monitor the entire load/unload process. The ramp strain arm (18), on which the ramp (16) is mounted, includes force sensors (46,48) that measure the friction force between the HGA (14) and ramp (16) as well as the air-bearing force on the slider (30) of the HGA (14) during the load/unload process. The signals form the force sensors (46,48) are input to a computer (22) through an interface circuit (24) for recording and analysis in order to evaluate the performance of the combination of the HGA (14), disk (12) and ramp (16).
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