Storage media · Sony exFAT recording card
M4ROOT folder missing from a Sony card
Can Sony XAVC clips survive when M4ROOT is missing?
Short answer
Yes, if the clip data was not overwritten: M4ROOT is a management folder, and its entries can vanish while the MP4 data of the clips remains on the card. Whether a clip is usable depends on an intact container. Do not let the camera recreate folders; scan the whole exFAT volume read-only for XAVC S or HS MP4.
The situation
The expected M4ROOT tree is absent or incomplete while card capacity suggests prior recordings.
M4ROOT is where a Sony body keeps its clip management data, and it can be removed or damaged without the recorded MP4 data going anywhere. Whether a clip proves usable afterwards depends on the container itself being intact, not on the folder that once listed it.
01 / Diagnose
Work out what actually disappeared
Sony XAVC recordings sit inside M4ROOT alongside index and thumbnail files that the camera rewrites constantly. A cancelled format, an interrupted card change or a deletion during playback can take out that tree while the clip data stays in the free space. The body, once it finds no M4ROOT, offers to rebuild the structure, and that rewrite lands where the old clips are.
Management folders can be deleted independently of MP4 data, but container integrity still determines recoverability.
Check the last known path, trash and backups without writing to the original device.
02 / Protect the source
Preserve the best recovery chance
- 1
Keep the card out of the Sony body so it cannot recreate M4ROOT or repair the management files on its own.
- 2
Check the menu or the manual for whether the recordings were XAVC S or XAVC HS, as both are MP4 containers with different profiles.
- 3
Scan the entire exFAT volume read-only rather than one folder, because the directory that pointed at the clips is precisely what went missing.
- 4
Export the recovered MP4 clips to another disk and name them by recording time before handing them to an editor.
Do not let the camera rebuild its database, and do not record a short test clip to see whether the card still works. Both write into the region that holds the clips, and a rebuilt M4ROOT tree brings back not a single frame of footage.
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.
Management data, clip names and camera metadata that existed only in M4ROOT do not come back with the footage. File Recovery Hero recovers MP4 containers from readable exFAT volumes and does not repair a clip whose structure was already incomplete when recording stopped.
04 / Verify
Check the recovered content, not just its name
A clip counts as recovered when a player reports its full runtime, when the picture runs to the last frame with its audio tracks present, and when your editor imports it without complaint. Clips that open and then stop after a few seconds lost part of their data.
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 Sony exFAT recording card be recovered in this situation?+
M4ROOT is where a Sony body keeps its clip management data, and it can be removed or damaged without the recorded MP4 data going anywhere. Whether a clip proves usable afterwards depends on the container itself being intact, not on the folder that once listed it. The result still depends on what remains readable on the source.
What should I avoid before scanning?+
Do not let the camera rebuild its database, and do not record a short test clip to see whether the card still works.
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 clip counts as recovered when a player reports its full runtime, when the picture runs to the last frame with its audio tracks present, and when your editor imports it without complaint.