Emergency · unmountable memory card
Format prompt appears every time the card is inserted
Why does every device ask to format my memory card?
Short answer
Usually because the file system is unreadable, and every device reports that the same way; it does not show whether the flash is healthy or dying. Cancel every prompt. Check once that a computer sees the correct capacity, image the card if it reads stably, and run logical recovery only from that image.
The situation
Camera and computer both reject the existing volume and offer formatting.
Every device reports the same thing in its own words: the volume cannot be mounted. That message describes the file system layer only. It says nothing about whether the flash underneath is healthy, which is the question that decides how carefully the card must be handled.
01 / Diagnose
Work out what actually disappeared
The boot sector, the exFAT allocation structures or the partition entry may be damaged, so neither camera nor computer finds a file system it recognises and both fall back to offering a format. The same prompt appears when a controller is failing and returns unreadable sectors, which is why the card capacity needs checking once before anything else.
The file system may be unreadable, but repeated prompts do not establish whether the flash is physically stable.
Check the last known path, trash and backups without writing to the original device.
02 / Protect the source
Preserve the best recovery chance
- 1
Cancel or dismiss the format prompt on every device, and never answer it with yes to make the card accessible.
- 2
Open Disk Management or Disk Utility once and check that the card reports its printed capacity rather than a few megabytes.
- 3
If the capacity is right and reads do not stall, image the whole card to a file on a healthy drive.
- 4
Run the recovery scan against that image, export to a third drive and leave the card itself untouched from then on.
Do not run CHKDSK, First Aid or any repair utility on the card to silence the prompt. Those tools write corrected metadata onto a source whose structures are already wrong, and a repair that misjudges the layout can scatter the media files it was meant to save.
03 / Choose the method
Match the tool to the source
For stable, readable exFAT, NTFS and FAT16/FAT32 or uncompressed IMG, DD, RAW and BIN images.
Unconfirmed exports are marked .UNVERIFIED.
If the card no longer reports its true size or drops off the bus during imaging, the fault is physical and belongs in a data recovery lab. File Recovery Hero works only on media that read stably, read-only, from exFAT, NTFS or FAT structures and images of them.
04 / Verify
Check the recovered content, not just its name
A usable result means files exported from the image open on their own, with sizes and capture dates that match the shoot. If the imaging pass logged read errors, note which files came from those areas and inspect them individually before the card is written off or reused.
Keep the source until two verified copies exist. One working preview is not enough.
Sources and technical references
FAQ
Questions about this recovery case
Can unmountable memory card be recovered in this situation?+
Every device reports the same thing in its own words: the volume cannot be mounted. That message describes the file system layer only. It says nothing about whether the flash underneath is healthy, which is the question that decides how carefully the card must be handled. The result still depends on what remains readable on the source.
What should I avoid before scanning?+
Do not run CHKDSK, First Aid or any repair utility on the card to silence the prompt.
Does scanning write to my memory card?+
Your memory card is only read. Nothing is saved to it.
How do I know whether the result is complete?+
A usable result means files exported from the image open on their own, with sizes and capture dates that match the shoot.