Why FAT32 loses filenames
FAT32 tracks files with a File Allocation Table plus directory entries. When a file is deleted, FAT32 does something NTFS does not: it overwrites the first character of the filename in the directory entry and releases the chain that recorded which clusters belonged to the file.
So two things are lost immediately — part of the name, and the map of where the file's pieces were. That is why FAT32 recovery leans on signature carving: finding files by how they begin and end, rather than by asking the file system where they are.
Use Carving Only or Deep Scan
- Carving Only — the right choice for a USB stick or SD card. A pure signature sweep that recovers file contents regardless of what the directory entries say.
- Deep Scan — the default, and the safer pick if you are unsure what the volume is. It attempts the file-system read first and then carves.
Either way, expect contents without original names. For photos and video that is usually fine — you can see what you recovered. For documents, plan to open a few to identify them.
FAT32 quirks worth knowing
- 4 GB file size limit. FAT32 cannot store a single file larger than 4 GB, which is why long recordings on a FAT32 card are split into multiple files. When recovering video, look for the whole set, not one file.
- Fragmentation is common. Cards that have been filled and cleared many times scatter files across the volume, and carving reassembles fragmented files less reliably than contiguous ones.
- "The card needs formatting" prompts. This usually means the FAT is damaged, not that the data is gone. Do not accept the format — scan the card first.
Recovering from a FAT32 volume
- Stop using the card or stick immediately — no more photos, no more copying onto it.
- Connect it through a card reader or USB port and open RecoverHelper.
- Select the volume, then choose a destination on your computer's drive. Writing recovered files back onto the same card would overwrite what you are still trying to rescue, so it is blocked.
- Run Carving Only (or Deep Scan) and let it finish — on a failing card, bad-sector tolerance skips unreadable areas rather than stopping.
- Preview the results and restore what you need.