Audio · exFAT recorder card
FLAC recording: recover after deletion
How can I recover losslessly compressed FLAC files after deletion?
Short answer
Yes, often, and FLAC lets you verify the result: its frames carry checksums, and the STREAMINFO block can store an MD5 of the decoded audio. Stop recording, remove the card and scan it read-only. Then run a FLAC test on every recovered file; a failed check marks a take that is not intact.
The situation
losslessly compressed FLAC files no longer appears in its recording folder even though the storage device is still detected.
The card is still readable and the folder is intact, but the FLAC file is no longer listed. The entry was released, not the audio: encoded frames remain on the exFAT card, and FLAC offers an unusually reliable way to prove afterwards whether a recovered take is complete.
01 / Diagnose
Work out what actually disappeared
A deletion clears the directory entry and frees the clusters, while the encoded frames stay where they were written. FLAC stores a STREAMINFO block at the start with sample rate, channel count, total sample count and an MD5 of the decoded audio, and every frame carries its own CRC. That structure makes a partly overwritten take detectable rather than merely suspicious.
Deletion can release a directory reference before later writes reuse every block that belonged to the file. For FLAC recording, this matters because STREAMINFO, metadata and frame checksums allow strong validation
Check the last known path, trash and backups without writing to the original device.
02 / Protect the source
Preserve the best recovery chance
- 1
End the session on that card, switch the recorder off and read the card in a card reader from now on.
- 2
Note the expected duration and sample rate of each missing take, so recovered files without names can be told apart.
- 3
Scan the card read-only and reject any offer from the system to check, index or repair the volume.
- 4
Export the results to a different drive and run the decoder test that FLAC tools provide on every file.
Do not record over the card to test that it still works, and do not let a media indexer write thumbnails or databases onto it. A FLAC file that loses even one block fails its checksum, and a failed frame cannot be reconstructed from anything left on the card.
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.
File Recovery Hero reads the exFAT card without writing to it and exports files after a free scan, for a one-time 50 EUR. It does not repair FLAC frames that failed their checksum, and it cannot restore audio from clusters that later recordings have taken.
04 / Verify
Check the recovered content, not just its name
Run a FLAC test pass: a file that decodes without a single CRC error and matches the MD5 stored in STREAMINFO is intact, not merely playable. Compare the reported duration with the length you noted; a take that ends early passed the test only for the part that survived.
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 exFAT recorder card be recovered in this situation?+
The card is still readable and the folder is intact, but the FLAC file is no longer listed. The entry was released, not the audio: encoded frames remain on the exFAT card, and FLAC offers an unusually reliable way to prove afterwards whether a recovered take is complete. The result still depends on what remains readable on the source.
What should I avoid before scanning?+
Do not record over the card to test that it still works, and do not let a media indexer write thumbnails or databases onto it.
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?+
Run a FLAC test pass: a file that decodes without a single CRC error and matches the MD5 stored in STREAMINFO is intact, not merely playable.