Firewire drive does not sleep when iMac sleeps

My G-Tech G-Drive Mini connected via Firewire to an new iMac will not spin down when the iMac goes to sleep. It does spin down with the iMac active, but will spin up when the iMac goes to sleep. On a MacBookPro with Tiger, the drive will spin down when the Mac sleeps, which I would expect to be the "normal" behavior for an external drive. Is this a Drive issue or an iMac Firewire bus issue?

By the way Bosanac...
Welcome to the Apple Discussions!
It seems as though I had a similar issue with my ministack external drive and I stopped using it and I have used several different external drives with all my Mac including my iMac. It's definitely hard to say as I would lean more towards the G-drive. I would contact G-Technology and see if they have nay suggestions.
Keep in mind that there have been many issue with OSX SL and that too maybe an issue.

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