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10.6: Use wake-on-demand to help conserve energy
Authored by: Dr. T on Dec 28, '09 10:40:59AM

The newer Macs use little energy when their monitors and hard drives are sleeping. There is no advantage to putting them to sleep for short periods. The hint is most useful for older Macs that use significant power while idle.



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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.
g=



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