External HDD won't mount to desktop from 1/2 of USB Ports

10-11  Source: Network gathering  Views:4 

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I have an external Iomega HDD and when it's plugged into my left USB port it works fine but when it's plugged into the right USB port it won't mount to the desktop and I can't access it. It doesn't show up in the system profiler or disk utility either.
However other usb devices (wireless mouse for example) work fine when plugged into that port. So I don't think it's the drive because it works in other ports and the port seems to be at least partially functional... But not with the drive.
Any ideas?
Is the drive bus-powered or does it have its own AC power adapter? Are you using a hub?
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