I have a USB thumb drive that my computers can read but can't write. It has a read-only switch, SPDT, but flipping it makes no difference, nor does unsoldering it and replacing it with a jumper wire. Is there something else that may work, such as running a special utility (The manual refers to a "recovery disk," but the driver CD contains no such thing) or shorting a certain reset pin?.
This device uses an OTI 6828 USB bridge chip and was distributed by Pretec as the iDisk and also given out by Microsoft years ago (they have nothing on it), but I can't find any information about it.