Having a small problem at the moment. Despite unticking the option to power down the hard drives, they keep on doing just that. I'm on Snow Leopard 10.6.1. I used to sometimes have this issue on Leopard as well but never got to the bottom of it. I can't upgrade to 10.6.2 because Apple broke the ATI drivers when they fixed an issue with the Nvidia ones, so my Matrox MXO won't work with it (not Matrox's fault, entirely Apples). It is becoming a bit irritating having to wait a number of seconds sometimes while the hard drives spin up after being left for a few seconds. When I'm video editing it is extremely frustrating. Especially as I have 7 hard drives attached. Has anyone else come across this problem before?