Videoterry did you ever find a solution for this problem? I have a Centon 64gb drive that was working fine and then out of nowhere it somehow became 'Read Only' And just like yours I cannot reformat or re-partition. I've searched numerous forums and sites for a solution to no avail. There is no write protect switch on it so that's not the problem. Trying the 'disk manager' does not work because you get the No Permission message...What I have found though is, There are several post about the same problem with the Centon 64gb DataStick Pro.