Turn it off, and it will be able to remove write protection on a USB or SD card. Post this, you should be able to write on the disk. Read: How do you remove the Write Protection on a Disk.

You should also check your SD card for write protection and turn it off. If that doesn’t work, then use the CHKDSK system tool, format the SD card (if possible), and test your SD card with a new ...

Again, replace the letter "d" with the drive that is write protected. The other letters direct the app to turn off read-only protection on the entire drive.