If ReOrg runs out of memory or caches too many files, it barfs and leaves you with an invalid hard drive. ALWAYS back up your drive, first. ReOrg is NOT the same calibre as defrag utils you get with Windows. Period.
For the record, I have never, ever had such a problem with ReOrg. It's always worked great. Though, I don't use it any more since I have a very large and fast HD now.
