Every SD card has a tiny controller that manages where data is stored on the flash chips. When the controller encounters a critical error—often due to poor quality components—it may dump its current state into a
: While unlikely to work if the controller is locked, some users try tools like Disk Drill to see if any partitions can be reconstructed. Reformatting : You can try to format the card using Windows Disk Management or sd+card+uupdbin
If you intend to install Windows directly from the SD card without a separate USB drive: Every SD card has a tiny controller that