I have two Lacie Porsche 500GB usb external hard drives attached to my PowerMac G5 (OS X 10.3.9, dual 2.0 Rev B). When I put the computer to sleep the drives do not spin down. I have to manually dismount them and turn them off before putting the computer to sleep. (Shutting them off while it's asleep wakes it.) Does anyone know how to fix this? I have checked the "put disks to sleep when possible" option in system prefs. Thanks!