Directory Issues on External Drive?

I have a Mercury Elite Pro 160GB external drive, and sometimes it won't mount. Disk Utility and DiskWarrior say there's no problem.
If there's corruption, does using Disk Utility to erase the drive also rewrite a new Directory? A Mac tech told me that only Repartitioning will truly delete/write a new Directory. Don't know if that's true.
The drive won't mount half the time. I've erased it twice. I ran the Drive Genius thirty-minute hardware test; the drive looked okay.
What's the real story on Directory corruption? Thanks.

Along the hardware lines, it would also help to know with what kind of computer you are using this (generally helpful for any question asked here).
Before you return it I would suggest checking things like the cable (as BDaqua suggested), that your board and connections are secure. Are you plugging this directly into the computer or daisychaining?
Message was edited by: Limnos

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