Is there a software that came with the disk?
Take that back, read some more and found this:
1. Open Start Menu
2. Run, type regedit and press Enter; this will open the registry editor
3. Navigate to the following path:
4. Double click the key WriteProtect in the right pane and set the value to 0 In the Value Data Box. Press OK
5. Exit Registry
6. Restart your computer and re-connect your USB pen drive on your computer.