Power management on a iMac G5

I'm in communication with Seagate over the behaviour of my OneTouch
external drive.
Seagate have asked me, and I quote,"I understand the drive will spin up
and down randomly. If you disable your power management feature within
your MAC so that your drives are set to never spin down does this help
with this issue?"

Can someone tell me how to do what the Seagate rep is asking. Thanks,


He spoke with a certain what-is-it in his voice, and I
could see that, if not actually disgruntled, he was far
from being gruntled.
P.G. Wodehouse 1881 -1975