* **For SD cards 32GB or smaller:** the latest version of [SD Formatter](https://www.sdcard.org/downloads/formatter/sd-memory-card-formatter-for-windows-download/)
* **For SD cards 64GB or larger:** The latest version of [guiformat](http://ridgecrop.co.uk/index.htm?guiformat.htm)
+ Your SD card write-protection switch may be [enabled](/images/sdlock.png). The lock must be flipped upwards to allow writing to the SD card (including formatting).
+ Your SD card may be partitioned or have unallocated space. Follow the instructions [here](https://wiki.hacks.guide/wiki/SD_Clean/Windows) to reformat your SD card.