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Algorithm for deciding when to wake a drive?

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Algorithm for deciding when to wake a drive?

Subject: Algorithm for deciding when to wake a drive?
From: Andre-John Mas <email@hidden>
Date: Tue, 21 Jul 2009 22:00:49 -0400

Hi,

I have a user complaining that one of his hard-disks is spinning up when he is not expecting it. What algorithm does Darwin/MacOS X use to decide when to wake a drive? For example is it when the file system is accessed or a specific volume, or does it vary based on certain conditions?

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