To help us assist you, please provide more information:
1) Decribe the issue you are having in detail. For example if its with a specific piece of equipment, include the make and model. 2) When was it last working normally? Since then, did you add/remove any software or hardware? 3) What steps have you already tried to resolve the problem? (rebooted, searched google, etc)
how to remove the write protection
USB ? - Normally you format the drive. Sandisk ? Manual setting on drive.