Cannot Write to USB Drive after it wakes up

I have a couple of external USB drives. Once one of them goes to sleep, I cannot write to it or eject it when it spins back up. When I try to copy and file to it the files seems to copy ok and when it's just about finished it errors out. This happens with the finder and with Pathfinder as well. If the drive sits and OS X spins it down I can't write to it or eject it when it spins back up. I just get the usual drive is busy, can't eject and any write attempt fails. I have to force disconnect it and reconnect it for it to function normally again. Tried a permission repair and that found no problems.
Any ideas?

Ok. More details. Apologies for the lack of them to start with.
The Case is a Vantech USB/SATA HD Dock. It has it's own power (i.e. it is not powered by the bus). The Drive in it is a Western Digital 1TB Caviar Green. It has done this on all USB ports and with any computer it has been connected to. Mac computers any way, I have connected it to a windows box at work, but not long enough for the problem to manifest it self. Unfortunately I don't have a Mac I can hook it up to directly via SATA to see if it is the enclosure. I found another SATA enclosure here at work to try it with tonight. It's not the computer going to sleep that is causing the problem. It the OS spinning down the drive.
I get this in the console log when I try and unmount the drive via the finder:
20/07/09 11:17:00 AM /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[3426] StatusMonitor::volumesChangedCallBack returned -47

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