Can I "reset" hard drive capacity

I'm not sure how it happened (although I suspect it was during an aborted install of Bootcamp), but an 80GB external (firewire) hard drive now shows up as a 55GB hard drive. I have tried everything I can think of -- well, OK, Disk Utility -- but I just cannot figure out how to get it recognized for the "drive it used to be." The drive is empty, so there is no concern about data loss, etc. Anybody?
MacBook Pro & Titanium PB (the Ol' 400) Mac OS X (10.4.7)
MacBook Pro & Titanium PB (the Ol' 400)   Mac OS X (10.4.7)  

but I just cannot figure out how to get it recognized for the "drive it used to be.It never showed as 80GB before, read this support article. Yet, 55GB seems a bit much on an 80. Have you tried a zero out erase?
-mj
[email protected]

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