Device removal error: why does external HD randomly eject?

I just picked up leopard, and a vantex enclosure and a 500 gb hitatchi enclosure. Whenever I try to run time machine, the external hard drive unmounts but the hard drive is still running. When formatted it coupe times over as a mac OS Extended (Journaled) with a GUID Partition Table. But its still giving me problems. Also when I try to verify or repair the disk it does the same thing. It seems like when its spinning up really fast it doesn't work right.
please help!!

I have the exact same problem (but I'm not using time machine)
Checkout my thread here:
http://discussions.apple.com/message.jspa?messageID=7074847#7074847

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Message was edited by: Dave Sawyer

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Thanks for the suggestion but..
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Device removal error: why does external HD randomly eject?

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