Maybe that could be fixed by having a way to preload vast amounts of disk volume to cache. Anyway, I agree, spinning down is useful mainly for volumes that are either completely offline or have long periods of inactivity. Like three of the four disks in my workstation right now, which spend most of their time spun down courtesy of noflushd. BTW, the fourth disk will be changed out for a SSD pretty soon. Not doing so is just cruel and unusual self inflicted punishment.