If you are having a USB flash/pen drive with write-protection switch, you can adjust the switch as per the manual to enable or disable the write-protection feature. But I’ve come across many who complain that their USB flash/pen drives are showing on system as write-protected and so they are not able to add or delete or even format the same. After lot of research, I came across an utility which can solve the issue by doing Low-Level Formatting only for USB flash/pen drives. I tried the utility on a 4GB USB pen drive and found that it solved the issue easily within few minutes. Download USB Low-Level Formatter Utility from the following Link – http://www.apacer.com/en/support/downloads/Repair_v2.9.1.8A.zip

Run this utility and you’ll find your USB flash/pen drive back in working condition.