MBP/iBook won't read repaired USB drive?

I have an ativa thumb drive I've been using for a few months now. In the past few days suddenly my MBP (also an iBook) gives me the message "Disk you've inserted cannot be read by this computer - Initialize / Ignore / Eject."
So I opened Disk Utilities and ran 'repair disk' and it said minor repair was needed to the header. Ran repair disk it says disk is repaired. Run verify disk and it stops saying the header needs minor repair. Run repair disk, it says disk is repaired. Computer still won't read it.
I boot up from my startup disk and again open Disk Utilities from there. Run Verify Disk and Repair Disk and both say no repairs are needed? For grins I checked my HD and a minor problem was found so I ran repair disk on it. Disk Repaired. I've rechecked both drives nultiple times and each time the reslt is no repair required.
I launch from my on board system (i.e. without startup disk) and again computer says disk can't be read - initialize / ignore / erase? In fact I get 5 windows with that same message in rapid file on my screen.
Any idea what gives? If both drives are OK - why won't it read the info as before???

See KB Articles:
http://support.apple.com/kb/HT1411 Apple Portables: Resetting the System Management Controller (SMC)
http://docs.info.apple.com/article.html?artnum=2238 Resetting your Mac's PRAM and NVRAM

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MBP/iBook won't read repaired USB drive?

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