[SOLVED] Everything locked in thumb drive??

[gold_finger]

Some USB's have a way to enable write protection.  I don't have any of those myself, but sounds like yours might be one of those.  Look for some type of slider, button, or some other mechanical feature on the USB that may have gotten moved to enabled write protection by accident.  If don't see anything obvious, lookup the exact USB model number you have on the internet -- maybe instructions you find will tell you how that feature works and you can disable it again.