Video · exFAT video card
MP4 mdat without moov: recover after a quick format
Can video payload with missing MP4 metadata be recovered after a quick format?
Short answer
Often the video payload itself survives a quick format, but a clip that already lacked its moov index remains unplayable after recovery. Eject the card and record nothing on it. Recover the mdat data read-only, then record a reference clip with identical settings on a different card to repair a copy.
The situation
The medium now has a new empty directory, while the previous video payload with missing MP4 metadata is missing.
The format removed the card bookkeeping in seconds and left the video payload untouched, which is the good news. The bad news is unchanged by it: an MP4 that already had no moov index will still be unplayable once it comes back.
01 / Diagnose
Work out what actually disappeared
Quick formatting writes a fresh exFAT directory and allocation table over the old ones, so the clips become unreferenced rather than erased. A signature scan recognizes an mdat run and offers it as a file, but it cannot invent the sample tables the camera never wrote. That is why such a hit exports successfully and still refuses to open.
A quick format can replace file-system records without immediately overwriting every older content block. For MP4 mdat without moov, this matters because a large mdat can contain frames while the moov structure needed for playback is missing
Check the last known path, trash and backups without writing to the original device.
02 / Protect the source
Preserve the best recovery chance
- 1
Eject the card and record nothing on it, not even a short clip to test whether the camera works after the format.
- 2
Record a reference clip on a different card with exactly the same camera settings, resolution, codec and frame rate.
- 3
Scan the formatted card read-only and export the video payload to another drive, keeping that export unmodified.
- 4
Rebuild the index on a copy of the export using the reference clip, and compare the result against the untouched version.
Do not format the card a second time or run a full format on it later, and do not save the reference clip or the repaired file onto the same card. Every write reduces what a scan can still find in the data area.
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.
A quick format leaves data, a full format normally does not. File Recovery Hero reads exFAT, NTFS and FAT16/FAT32 volumes and uncompressed images read-only; repairing a container is a separate job for a repair tool. The scan is free, export needs the 50 € license.
04 / Verify
Check the recovered content, not just its name
Check the export size against the expected recording length before anything else, then judge the repaired copy. It should open in a normal player, report a duration in line with the shoot, and hold picture through to the end. Random blocks of noise mean the payload run was cut short.
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 video card be recovered in this situation?+
The format removed the card bookkeeping in seconds and left the video payload untouched, which is the good news. The bad news is unchanged by it: an MP4 that already had no moov index will still be unplayable once it comes back. 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 or run a full format on it later, and do not save the reference clip or the repaired file onto the same card.
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?+
Check the export size against the expected recording length before anything else, then judge the repaired copy.