Memory card or USB drive not working
The safest first steps when a card is no longer visible, asks to format or reports read errors after a session.
Read the guideWhen a CFexpress, XQD or CFast card asks to be formatted, drops offline or contains an interrupted recording, stop writing to the card and protect the original media.
CFexpress, XQD and CFast cards are usually used when the footage matters: weddings, interviews, commercial shoots, sports events and one-off productions. If the card behaves erratically, the safest response is to stop writes and move to controlled diagnosis instead of testing random recovery tools on the original media.
Start by checking whether the problem is the card, reader or camera. Use another reader once if you have one available, but avoid repeated reconnecting. If the media is visible, do not record anything new to it and do not initialise or format it. New writes can overwrite the allocation data and video fragments that may still be recoverable.
Consumer recovery software can help only with simple logical deletion on stable media. It becomes risky when the card disconnects, appears with the wrong capacity, heats up, throws read errors or asks to be formatted again. In those cases the safer route is controlled imaging and read-only analysis on a copy.
If the camera or computer asks to format the card, leave the prompt unanswered and remove the media safely. If recording stopped during an event, avoid letting the camera repair the clip automatically unless you already have a verified copy. With CFexpress and XQD media, controller behaviour and fragmented video metadata can matter as much as the visible file system.
For commercial work, build a workflow that assumes media can fail: rotate cards, verify clips during breaks, keep duplicate destination storage ready and maintain backups after each session. Retire cards that have shown instability even once.
Software recovery may still be worth trying only in narrow situations: the card is detected consistently, capacity looks correct, there are no repeated disconnects and the device does not heat up abnormally. Even then, save recovered files to different media and avoid writing anything back to the original card.
That difference matters especially on CFexpress and XQD media used for paid work. A controller problem, damaged connector or unstable NAND can turn a recoverable card into an unreadable one if it is kept under load.
If the material is commercially important, attach that information when you contact the laboratory. Priority assessment makes sense when the card contains the only copy of paid work, raw footage for an edit deadline or evidence that cannot be recreated.
If the card contains unique footage, stop using it and describe the camera model, card model, recording format and last visible symptom. The lab can then decide whether safe imaging or deeper flash-media diagnostics should come first.
Useful next steps:
Before you submit a CFexpress, XQD or CFast card, compare the symptoms with general card first aid and the safe copy workflow after a shoot.
The safest first steps when a card is no longer visible, asks to format or reports read errors after a session.
Read the guideHow to reduce the risk of losing photo or video material once the card leaves the camera or recorder.
Read the guide