How to Delete SD Memory Card Partitions. You must format an SD card prior to using it for storage. However, if you format the SD card into more than one partition, you can only use the active ...

The best way to clear an SD card is to format it, which is like hitting a factory reset button; it'll erase every file, leaving just an empty card.

Formatting a memory card deletes all of the files stored on it immediately. You can format an SD card using the menu system on your Fuji camera or by inserting it in your computer's card reader.