waking hard disk stalls system

hey guys, iv set my hard drives to sleep after 20 minutes inactivity(all except c:\ which runs on a separate physical disk).

the problem is that when any other drive wakes up, the whole system stalls and waits for it to fully spin up before resuming whatever it was doing(eg. playing a game of team fortress, or watching a video)

is there anyway to stop the stalling while still allowing my hard disks to go to sleep?

Having this same annoying problem