hard drive power down in FC1

[M.Hockings]

In the BIOS I have the hard drives set to spin down after 10 minutes of 
inactivity.  This seems to work just fine if I run under Windows (sorry 
for the bad words :-).  However in FC1 they never seem to spin down.  
Where might I find a comparable setting to cause the drives to power off 
when they have been idle for some period of time?

Season's Greetings,

Mike