SD card not recognised, "You need to format the disk": recover photos and files
Last reviewed 2026-09-19
When a card says it needs formatting, its file system index is damaged but the photos and videos are usually still on it. Every JPEG, PDF or ZIP has a recognisable start and structure, so they can be found by scanning the raw data, without the folder structure.
Messages you might see
- “You need to format the disk in drive before you can use it.”
- “SD card is blank or has an unsupported file system”
- “The disk is unreadable / SD card not detected”
Why it happens
- The card was removed while the camera or phone was writing.
- The file system was damaged by a crash, a virus or an unsafe eject.
- The card is starting to fail.
Try this first (free, no tool needed)
- Stop using the card immediately and do not format it. Anything written afterwards can overwrite the files you want.
- Try another card reader, cable and USB port. Many failures are the reader, not the card.
- Make a complete image of the card with a disk-imaging tool (for example ddrescue, Win32 Disk Imager or the free dd), and work from the image.
- For large cards or the widest file-type coverage, the free desktop tool PhotoRec is the standard choice.
If that didn't work
These tools run in your browser. Your file is read and repaired on your own device and is never uploaded.
SD/Memory Card File Extractor
Scans a raw image of the card for JPEG, PNG, GIF, BMP, WebP, HEIC, PDF, ZIP / Office files, 7-Zip, MP4 / MOV, AVI, WAV and SQLite files, works out where each really ends and gives them back in a ZIP sorted by type. File names, folders and dates are not recoverable, fragmented files can come out incomplete, and the image has to fit in your browser's memory (up to 900 MB).
Open SD/Memory Card File ExtractorCommon questions
My card is 64 GB. Can I use this?
The image must be under 900 MB to load in the browser, so for a large card use a desktop tool such as PhotoRec, or image only the part of the card you are interested in.
Is my file uploaded anywhere?
No. The tool runs as a program inside your own browser, so the file is read and repaired on your device and never sent to a server.