About Energy Saver sleep and idle modes in Mac OS X - Apple Support
On all Macs:
- The microprocessor goes into a low-power mode
- Video output is turned off, and a connected display may turn off or enter its own idle state
- Apple-supplied hard disks spin down; third-party hard disks may spin down
Read full article from About Energy Saver sleep and idle modes in Mac OS X - Apple Support
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