Specifications

More about automatic sleep
The Battery Conservation slider controls three power conservation features:
system sleep, screen dimming, and hard disk spin-down.
m System sleep is a state in which your computer uses only the power it needs
to maintain the contents of RAM (such as any open programs and
documents, and various control panel settings). You’ll see a green light
flashing at the top of the display when the PowerBook is in sleep.
m Screen dimming saves battery power by automatically dimming your
PowerBook’s display screen. The display screen is one of the main
consumers of battery power.
m Hard disk spin-down stops your computer’s internal hard disk from spinning
when it isn’t being used. If the PowerBook is in sleep, then the hard disk
automatically spins down.
Notice there are five settings on the Battery Conservation slider:
The time it takes for each feature to take effect depends on the settings you
choose. If you drag the slider toward Better Conservation, it takes less time
for the system to sleep, the hard disk to spin down, and the screen to dim.
The table indicates how the battery conservation settings correspond to sleep
times.
Minutes it takes if you choose
Conservation Performance
System sleeps 2 3 6 8 15
Hard disk spins down 1 2 3 6 8
Screen dims 1 2 3 4 5
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Power Management
The five settings in the Battery Conservation slider
indicate the time it takes for your computer to go to sleep,
the screen to dim, and the hard disk to spin down.