After being using my top spec iMAC with SDD and HDD, I'm really annoyed the way SL is handling sleeps and secondary drives, usb or internals. It supposed to be a very quiet machine, but SL makes a second hard drive and any USB drives connected starting and stopping constantly with no reason. I can understand why it triggers all the drives after sleep, but I don't understand why it needs an access to an empty drive all the time during the day. I counted about 20 times its on and off. Why do I bother? HDD drive makes a loud humming noise, which is beyond of my standards for quite machine. There is no workaround for that and I will accept it if I can turn off this drive when I do not need it. Does anyone know how to fix it? Unmounting drives its not a clean option and I will have to mount it again shall I need it, and after sleep unmounted drive will spin forever. Also after 3 weeks iMAC won't go to sleep anymore on idle. If I force it, it will, but not automatically, I read some post about it but found no answer. I removed all possible software may prevent it with no luck. I've been a Windows user since Windows 3.11 release and recently moved to MACs, thought so far I'm more disappointed than happy with MAC OS. I hope LION will make me feel different and like it after all.