Thanks George, I ran dbcc checkdb turned out fine. Funny thing though is it forced me to turn the db into single user mode which I thought was odd because usually the db doesn't need to be in single user mode. The server event log only shows the same error message we get in sql server error log. We dropped all users on db and recreated them and now the back up works fine. Weird stuff. I'm leaning towards an OS/ drive or driver issue? Appreciate the help.