False-capacity flash recovery
Some counterfeit cards report a larger logical capacity than the NAND physically provides. They may appear to save files normally until writes wrap, overwrite earlier blocks, or return corrupted folders, videos, and photos.
Understand the symptom
A host trusts the capacity reported by the card controller. If firmware falsely maps logical blocks beyond real NAND, later writes can wrap onto earlier physical pages. Sony identifies unusually slow writes, corrupt reads, strange undeletable files, and inability to hold stated capacity as counterfeit warning signs.
What you may see
The reported size may not match genuine models or physical NAND.
Writes beyond real capacity may have overwritten previous blocks.
Invalid mappings or corrupted filesystem metadata are being returned.
Only part of the advertised address space stores independent data.
Protect the source
H2testw-style verification writes across the entire device.
New filesystem metadata replaces evidence of how files were allocated.
Every new write can destroy older photos or video.
Do this now
Stop the camera, phone, drone, or recorder without taking test media.
Model, serial, seller, labels, and genuine-capacity references help interpret the card.
Identify earliest good files, when corruption began, and the amount written.
Any verification should happen only after a best-available read image exists.
NEPFOSYS process
NEPFOSYS compares reported geometry, controller behavior, labels, and failure pattern.
Readable logical space is captured without a destructive fill test.
Surviving directories, signatures, fragments, and thumbnails are validated.
A clear next step
Start a case with the exact symptoms, incident timeline, prior attempts, encryption details, and the files that matter most. NEPFOSYS will route the case to the appropriate DFW intake or nationwide mail-in path.
Start with a case reviewQuestions, answered
Yes. Controller firmware can report a logical capacity larger than the physical NAND.
Not before recovery. These tests write the entire card and can overwrite remaining data.
No method can recreate blocks that were fully overwritten, but unaffected regions, previews, and fragments may remain.
DFW local · Nationwide mail-in