USB Hard Drive set up as Time Machine - Unmounts randomly

Hey everyone,
I recently purchased a Seagate FreeAgent USB 2.0 External Hard Drive which holds 1TB. I plan to use it to backup what's on both my internal 80GB and my external 500GB.
However, lately, throughout the day, the drive seems to unmount itself for no apparent reason. I'm not aware of any log to check this (and if there is one, someone please let me know).

 

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