Disk drive laser melt bump disk for accurate glide calibration and certification processing
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United States of America Patent
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Mar 11, 2003
Grant Date -
Jan 23, 2003
app pub date -
Jul 23, 2001
filing date -
Jul 23, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A bump disk for accurate glide calibration has a new type of glass laser melt bumps that give the same signal amplitudes as conventional AlMg laser melt bumps for the same bump height. The present invention provides a solution to switch the calibration bumps from AlMg to glass, and can be used in disk manufacturing lines to save 30% on the cost of hard disks from inaccurate glide certification processes. The solution is to trim or burnish away loose and/or high particles on production disks before the glide tests. This additional processing step causes the responses from the glass bumps to become very similar to those of the AlMg bumps, thereby enabling glass and AlMg disks to become materially compatible.
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