DJI-Formatted microSD Reads All Zeros: Can the 4K Footage Still Be Recovered?
There may still be a professional recovery path, but ordinary software recovery is probably at its limit. In this r/datarecovery case, a 512GB SanDisk microSD in a DJI Osmo Pocket 3 held roughly 500GB of important 4K footage. After an in-camera format, no new footage was recorded, yet PhotoRec recovered zero files, DMDE found nothing useful, and HxD appeared to show 00 across multiple offsets. That is more serious than a normal missing-partition case.
Stop Software Attempts
Do not format the card again, write anything to it, or keep cycling through recovery programs. If the footage is irreplaceable, preserve the original card for a specialist who handles microSD monolith/NAND recovery.
Does a Fast Format Mean the Old 500GB Must Still Be There?
No. The SD specification supports ERASE and DISCARD operations. After an erase, a card may return all zeros or all ones; after a discard, previously written data may become partly or completely unavailable through normal reads depending on the card implementation. DJI does not publicly document which low-level command its in-camera format uses, so a format taking less than a minute does not prove the old video bytes remain logically accessible.
What Do PhotoRec Finding Nothing and HxD Showing Zeros Mean?
PhotoRec looks for file signatures in readable underlying data. If checks across the card really return only zeros, ordinary recovery software has no old MP4 bytes to carve. That does not prove the NAND cells were physically erased, because the controller sits between the computer and the flash memory. It does mean the normal logical interface is no longer exposing the old footage.
Should You Send the Card to a NAND Recovery Lab?
Yes, if the footage is genuinely irreplaceable, this is the point to get a professional evaluation instead of trying another scanner. Specialist microSD recovery can bypass the normal interface and access NAND through monolith test points. Success is still uncertain: SanDisk video recovery can require controller-translator reconstruction, and fragmented camera footage can be difficult to rebuild correctly.
Best Next Step
- You want the best remaining recovery chance: stop using the card and send the original to a lab that specifically handles microSD monolith/NAND cases. Tell them it was formatted in a DJI Osmo Pocket 3, no new data was written afterward, and logical reads appear to return zeros.
- You are considering one more recovery app: another ordinary scanner is unlikely to change the result if every tool is reading the same zero-filled logical sectors. What could change the evidence is direct flash-level access, not another file-carving pass.
For this case, the decision is no longer “which recovery software should I try?” It is whether the footage justifies professional flash-level recovery.