Hmm.. I have three different drives and none of them sleep properly. I'm thinking it's the OS that isn't doing it's job. In fact, my computer won't even go to sleep if I leave something plugged into the left USB port on my MBP. Glitchy OS....
that applies to external hard drives as well?FWIW
I have to Lacie drives (FW) and 1 Ministack (FW) connected to my iMac and they all sleep properly.
In Energy Saver prefs have you selected to put the HD to sleep when possible?
I have heard others say the same. Mine are all connected via FW.Most Firewire enclosures go to sleep when inactive. A bit of a hit and miss with USB.