Audio · exFAT recorder card
FLAC recording: recover after a quick format
Can losslessly compressed FLAC files be recovered after a quick format?
Short answer
Often yes, as long as the card was not reused: a quick format rewrites the file system but leaves the FLAC frames in place. Eject the card without a test recording and scan it read-only. Compare the expected duration and sample rate you noted with each recovered file's STREAMINFO block to identify the takes.
The situation
The medium now has a new empty directory, while the previous losslessly compressed FLAC files is missing.
After the format the card looks like a new one: empty, correctly mounted, ready for the next session. Only the file system was renewed, so the FLAC frames of the previous recordings still occupy the data area, unnamed and unprotected until the recorder starts writing again.
01 / Diagnose
Work out what actually disappeared
A quick format writes new allocation structures over the old ones and leaves encoded audio untouched. Recovery then works from the FLAC signature and the STREAMINFO block that follows it. Names, take numbers and recording dates lived in the directory and are gone, so identification has to come from sample rate, channel count and total length inside each file.
A quick format can replace file-system records without immediately overwriting every older content block. 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
Take the card out immediately after the format, skipping the confirmation recording that recorders often propose at this point.
- 2
Write down how many takes were on the card and roughly how long each one ran at which sample rate.
- 3
Let a read-only scan work through the entire card so it finds frames anywhere in the data area, not only in the new directory.
- 4
Export findings to another drive and match each file to the take list using the values in its STREAMINFO block.
Do not format the card a second time, avoid a full format, and record nothing on it as a test. A full format overwrites the data area, and any new recording claims clusters that FLAC frames from earlier takes still hold, leaving files that fail their checksum.
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.
The exFAT recorder card is within reach of File Recovery Hero, which scans free of charge and exports for 50 EUR to a second drive. File names and folder structure are not recoverable from a formatted volume, and frames that new writes have replaced are lost for good.
04 / Verify
Check the recovered content, not just its name
Each recovered take should decode from beginning to end without a CRC error and report the sample rate and channel count the session used. The total sample count in STREAMINFO, translated into minutes, should match your note; a much shorter figure means only part of the recording came back.
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?+
After the format the card looks like a new one: empty, correctly mounted, ready for the next session. Only the file system was renewed, so the FLAC frames of the previous recordings still occupy the data area, unnamed and unprotected until the recorder starts writing again. The result still depends on what remains readable on the source.
What should I avoid before scanning?+
Do not format the card a second time, avoid a full format, and record nothing on it as a test.
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?+
Each recovered take should decode from beginning to end without a CRC error and report the sample rate and channel count the session used.