"No Access" privelage on external drive?

I purchased a SMARTDISK 250gig USB2 drive for my iMac G4 and MacBook Pro. Unfortunately, playing around with permissions for the drive (via Get Info), I set all to "No Acceess" and logged out. When logging back in, the drive does not appear.
Firing up Disk Utility, the drive shows up, but has the permissions greyed out. If I disconnect the USB chord, I get the device removal error. So, I know the drive is somehow "there". I'm Verified and Repaired the disk, and everything is a-okay.
I'm sure I could just reformat the drive, BUT, I had just copied 175 gigs of the last 10 years of important files and other junk, that I can't lose.
Anyone?
I'm able to become "Root" user via NetInfo Manager, but I haven't a clue what to do, if anything, from there.
I guess I'm looking to reset the permissions, but the only way I can view the drive, is thru Disk Utility.
Thanks for your help!
- AA
MacBook Pro 17"   Mac OS X (10.4.8)   OS X 10.4.8

Follow the instructions in this FAQ which are applicable to your situation.
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