If the SD card becomes accessible, congratulations. Reconnect the SD Card to a new computer.Switch the USB port, and change an SD card adapter.Quick Fix for Write Protection Removal on SD Card: If your SD card becomes write-protected, you cannot write any new data to the card, delete files on it, or format it. How do I format the write-protected SD card?' 'My SD card becomes unavailable and I tried to format the SD card, Windows says the card is write-protected. Format Write Protected SD Card (after Removing Write Protection) What Is a Write Protected SD Card, How Do I Format It Remove Write Protection from SD Card Part 2.