This is probably a really basic question, but...is there any way to get an external HD to stop spinning down all the time? I have an ACOM that spins down about every 15 minutes, and when I'm working with large graphics files, it's a pain to watch everything grind to a halt as the HD spins down and leaves me watching a spinning beach ball. It does this even when I'm actively doing something, not just when there's no activity. I've tried ACOM's support site, but they don't mention anything about how to control this, if possible. Can anything be done via Disk Utility or some other program?