
When deleting some files, the OS moves them from one place (the SD card) to another (the digital junk pile). However, when you format an SD card, your computer or camera or smartphone marks all storage space as empty. This allows other apps and devices to write anywhere in it.
Thus, they can write over the storage area your files used to occupy. That’s the last thing you’d want to happen if you were hoping to recover them.
There are many ways a card can end up formatted. Although not always, unfortunately, in most cases, the cause is user error. Some of the usual reasons your SD card can show up as formatted are:
Physically damaged SD cards might appear empty, formatted, or not show up at all on some (or all of your) devices.