> I installed Redhat 6.1. I could not find a way to set up the time to
> spin down the hard disk under the "system" or "setting" menu in gnome.
> Does this mean that the hard disk is always spinning? How can I
> experiment different timeout values? Is there anything like a
> "control panel" in which I can set the value to, say 3 minutes?
AFAIK, there is no graphical tool to do this. You will have to use
the command line. Read the man page for hdparm(8), and be aware that
the whole process is a bit risky in theory.
The command to set the spindown timeout to three minutes on your first
IDE drive should be `hdparm -S 36 /dev/hda'. If this works, you can
try to make the setting permanent with `hdparm -S 36 -K /dev/hda', or
(maybe safer) add the former command to your /etc/rc.d/rc.local.