Storage media · unstable SD card
SD card keeps erasing files: protect the remaining data
Why does my SD card keep deleting or losing files?
Short answer
Usually a failing or counterfeit card, file-system damage or repeated unsafe removal, and it will keep happening. Retire the card from shooting now, because every new recording can overwrite what remains. Image its readable data, recover from the image to another drive, validate each file and test the real capacity before trusting that card again.
The situation
Files appear to save and later vanish, or older folders disappear after new recordings.
Files appear to save and later vanish, or older folders disappear after new recordings. If the original source has not been written to again, useful file-system traces or data blocks may still remain for unstable SD card. A read-only scan can assess the source, but no result should be promised before that examination.
01 / Diagnose
Work out what actually disappeared
Counterfeit capacity, failing flash memory, file-system damage and unsafe removal can all produce recurring loss. Continuing to use the card can overwrite the remaining evidence. For unstable SD card, first separate a missing path, folder or volume name from actual deletion. That distinction determines the safest next recovery step.
Check the last known path, trash and backups without writing to the original device.
02 / Protect the source
Preserve the best recovery chance
- 1
Disconnect or remove unstable SD card and prevent further writes.
- 2
Write down the device, the date and the last action before the loss so you can match recovered files later.
- 3
Check known destinations, backups and trash without restoring anything onto the source.
- 4
Export every candidate only to internal storage or a physically different drive.
Retire the card from production, image the readable data and validate every recovered file on another drive. Do not record a test file and do not approve formatting or file-system repair.
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.
Software cannot reconstruct overwritten blocks or storage cells that are no longer readable. If the source disconnects repeatedly or becomes unusually warm, a professional laboratory is the safer route.
04 / Verify
Check the recovered content, not just its name
Validate files recovered from unstable SD card completely: compare the size and format, then read the content from beginning to end. A preview or surviving filename is not proof of a complete recovery.
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 unstable SD card be recovered in this situation?+
Files appear to save and later vanish, or older folders disappear after new recordings. If the original source has not been written to again, useful file-system traces or data blocks may still remain for unstable SD card. A read-only scan can assess the source, but no result should be promised before that examination. The result still depends on what remains readable on the source.
How do I know whether the result is complete?+
Validate files recovered from unstable SD card completely: compare the size and format, then read the content from beginning to end.
Does scanning write to my memory card?+
Your memory card is only read. Nothing is saved to it.