[技術討論] 咩係 搶先均衡磨損?

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Google is your friend.
Pre-emptive wear leveling is a way to distribute the grease in the pivot bearings. Since bearings are usually designed for 360deg of motion, but only go through ~60deg of travel in a drive, the internal grease can build up on both ends of the stroke. Over enough cycles, this can cause a problem if you have to turn off power to the drive and park the heads, as the actuator has to have enough "oomph" from the back EMF to go over the bump.
http://forums.storagereview.com/ ... leveling-pwl-on-wd/

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正確嚟講磁頭係喺磁碟表面飛行,而無接觸到磁碟表面。

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