The ability of the Mac to put internal and external drives to sleep is excellent to reduce wear and lower power consumption. Unfortunately it’s not convenient while editing when your workflow is paused as drives spin up.
I considered writing an AppleScript to automate the on/off of “put hard drives to sleep whenever possible” in System Preferences but hadn’t gotten around to it. Digital Heaven has beat me to it with a start-up application called Disksomnia.
Once loaded it looks for any running instances of Final Cut Pro or Express and keeps the drives from falling asleep. According to the Studio Daily Blog it doesn’t work with Avid or Premiere but we can hope Digital Heaven will support them at a later date. Free download from this page.[via Studio Daily Blog]