Why does the put display to sleep setting put the hard drive to sleep

In the energy options (preferences) for power adapter, I have set the display to sleep after 1 minute but the hard drive is set to never. I do this when I am downloading but don't need to use the macbook. However, the macbook seems to go to sleep anyway - any idea why? Any new settings?
I've maintained these settings on my Power Book G4 and it puts the display to sleep but keeps the Power Book on while downloading.
Thanks
Kru
Macbook Mac OS X (10.4.9)
Macbook Mac OS X (10.4.9)

May be try magic
Resetting your Mac's PRAM and NVRAM
and
Resetting MacBook and System Management Controller (SMC)

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Why does the put display to sleep setting put the hard drive to sleep

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