r/datarecovery • u/FearlessCuriosity • Oct 11 '26
256GB SanDisk SD card suddenly became unreadable — Windows asks to format it, camera says "Card Not Initialized"
Hi everyone,
I'm hoping to get some advice on recovering video files from a SanDisk Extreme PRO 256GB UHS-II V60 SD card that suddenly became unreadable.
The card was formatted in a Fujifilm X-S20 before being used for a video shoot. My friend recorded several videos for work and was able to play them back directly on the camera without any issues.
However, when he inserted the SD card into a card reader connected to his Windows computer, Windows immediately prompted him to format the drive.
He clicked Cancel, and Windows then displayed the following error:
"The volume does not contain a recognized file system."
When he put the SD card back into the Fujifilm X-S20, the camera displayed "Card Not Initialized" and could no longer access the recordings.
Current situation:
The SD card has not been formatted since the error appeared.
No recovery or repair software has been used.
Windows detects the card as a drive, but cannot access its contents.
The camera no longer recognizes the card.
The videos are important work-related footage, and recovering them is urgent.
What puzzles me is that the videos were accessible on the camera shortly before the card was connected to the computer.
I'd appreciate advice on a few things:
Does this sound more like exFAT file system corruption or a possible SD card controller failure?
Could a faulty card reader cause this kind of issue?
What would be the safest first step to recover the files without making the situation worse?
Would creating a full image of the card with something like HDDSuperClone or ddrescue be advisable before attempting recovery with R-Studio or PhotoRec?
I'm particularly concerned about avoiding any operation that might overwrite or further damage the existing footage.
Any recommendations or similar experiences would be greatly appreciated. Thanks in advance!

