The problem isn't with write protection. The file system has become corrupt and unreadable, or at least a section of it. Your best option is to use the mformat utility on the
…transcend website. USB drives can be write-protected by modifying the StoreageDevicePolicies Registry key and WriteProtect Registry value. Open Registry Editor by going to start>run>regedit and press control+f to open the find dialogue box. and type -driverdesc and press enter and you will see a file named -usb mass storage device. Right click on it and click delete. also delete any other file related to use device and close the window. then insert the usb device. your device will work fine. Note: deleting unknow files in the registry many cause certain programs not to work normally. Follow the link http://www.transcendusa.com/Support/DLCenter/index.asp?#L3 and select your device to download the online recovery software. you will be sorted. (MORE) 
