A full microSD card and a faulty microSD card can produce the same result: the camera stops recording. The fixes are not the same.
Deleting a few old clips creates free space. Formatting rebuilds the card’s file system and removes its contents. It is a maintenance step and a troubleshooting tool, not a tidier version of the delete button.
Back up first, format in the aircraft
Copy every file you want to keep and confirm that the copies open correctly. Then use the format command in the drone’s own camera app when the manufacturer provides one. DJI’s support guidance, for example, directs users to the Camera settings in DJI Fly. Formatting in the aircraft gives the camera a chance to create the file structure it expects.
That does not turn an incompatible card into a compatible one. If the aircraft reports a recognition error, DJI lists several possible causes: an unsupported card, a damaged card or a problem with the aircraft’s card slot. Its troubleshooting sequence is useful because it separates the card from the aircraft: test the card in another device, back up readable data, format it, reset the relevant camera settings and try again.
A successful format is one piece of evidence
After formatting, record a short test clip before the real flight. Play it back, check that its duration is plausible and confirm that the aircraft no longer shows a storage warning. A card that repeatedly disappears, reports errors or corrupts files should leave the flight bag rather than receive another hopeful format.
Speed and capacity still matter. Use the card types and limits listed for the exact aircraft model; a card can be healthy and still be unsuitable for the data rate or capacity the camera supports.
The habit is simple: copy, verify, format, test. “Card ready” should describe a result you checked, not an icon you glanced at while the propellers were already unfolding.
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