Maxtor ext hd error--corrupted or unreadable

::While finalizing importing of my music (iTunes) to my new Maxtor
OneTouch4 ext drive, I got an error message to run chkdsk
(G:\$Extend\$ObjId) as there was a corrupted file. Up to that point,
all was working fine. iTunes locked up (which happens frequently --
even before I added this drive) and had to \"force\" a re-boot. Now,
I'm unable to even access the drive at all and get an error message
saying that it is corrupted and unreadable. iTunes will open and lists
all of my music -- of course, I can't get to any of it though!
(18,000+ songs -- a lot to have to re-import! ) ):confused:

Any input on the chkdsk item above? Troubleshooting things to try?
THANKS!::