[SOLVED] Everything locked in thumb drive??

[Monkeyman]

I have a thumb drive that I've been using (successfully) for about a year.  I've always had read/write permissions and could obviously delete anything I wanted.  As of this morning, everything has become locked.  I am unable to delete ANYTHING.  I haven't done anything different with the thumb drive or with LL (2.2, if it matters).  It won't let me change the permissions, either.  I can't even edit and save any documents (for example, I have my job resume on the drive).

Any suggestions?  I use this daily and I need to be able to delete old files from it.