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Saving energy by spinning down the disks...
Authored by: gabester on Dec 28, '09 11:47:52AM

Except that, as far as I can tell with OS X virtual memory management, there's almost always a need to access something on the boot volume, which for the vast majority of people is a spinning platter hard disk. Believe me, on all my Macs I have "put hard disk to sleep when possible" checked but it is a rare day when I hear that disk spin down... and invariable it spins back up within 2 minutes of spinning down.

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