Sudden Motion Sensor

It's functionality that's provided by your MBP. There's nothing to choose from in particular, however, do NOT use a Western Digital Scorpio. There's similar functionality in these drives that causes crashing or hanging.

Why not in the case of a Scorpio drive-disable the sudden motion sensor as per:

http://docs.info.apple.com/article.html?artnum=300724

From OWC

Hello,
The early WD drives did have issues with Apple's SMS. The new drives do not have that issue.

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