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If the drone shows a microSD card error, start by protecting your recordings. Then confirm the card’s compatibility and distinguish a read problem from a speed warning. Formatting immediately may delete files you still wish to recover.
The procedure below serves to organise the diagnosis of drones with microSD recording, with examples from DJI documentation. Carry out these checks on the ground, with the equipment in the ventilation and safety conditions specified by the manufacturer.
Identify the symptom before changing settings
| What you observe | First check |
|---|---|
| The app does not detect the card | Confirm correct insertion, supported capacity, and whether a card reader on a computer recognises it. |
| A slow card warning appears | Compare the exact reference and speed class with the manufacturer’s list. |
| Recording stops or an error appears | Save existing files, check available space, and compare with another compatible card. |
| The file exists but plays poorly on the computer | Copy it to the disk and also check the compatibility of the video player with the recorded format. |
These checks help to separate hypotheses; none of them, in isolation, proves that the card is faulty. Note the exact message, the drone model, and the recording settings. This information is more useful for support than simply saying that the video failed.
U3, V30 and A2: read the correct symbols
According to the SD Association, U3 and V30 classes correspond to minimum sequential write requirements of 30 MB/s, within the conditions of the respective standard. The maximum speed number printed on the packaging does not replace the class required by the equipment.
Whereas A1 and A2 belong to the application performance class. They are not, by themselves, a certification of compatibility with the drone’s video mode. A card can have several of these symbols because they describe different characteristics.
Look up the exact model and capacity in the manufacturer’s list. For example, the DJI Mini 4 Pro technical sheet identifies recommended cards and indicates a maximum video bitrate of 150 Mbps. This list refers to the Mini 4 Pro; it should not be automatically applied to another drone.
How much space does the video take up?
Mbps means megabits per second; MB/s means megabytes per second. In a simple calculation, divide the first value by eight. Using the maximum 150 Mbps indicated for the Mini 4 Pro, you get 18,75 MB/s, or about 1,125 GB per minute.
This is a theoretical calculation at constant bitrate, not a flight measurement. Ten minutes would correspond to approximately 11,25 GB of video; the actual size depends on the settings, the effective bitrate, and the remaining file data. The calculation helps to plan space, but it is not suitable for approving a card that does not meet the necessary specifications.
A step-by-step test, without losing the originals
- End the recording and switch off the equipment before removing the card, as per the manual.
- If the computer recognises it, copy the files you need. Open some of the copied videos to confirm that the copy is usable.
- Confirm the card’s compatibility. DJI identifies incompatible cards, damaged cards, and problems with the drone’s port as possible causes of error.
- Only after copying, and if you do not need to recover other data, follow the formatting instructions for your model. Formatting deletes the files.
- Record a short test clip and check the result. If the error persists, compare with another compatible and known-working card.
The official DJI guidance on microSD errors includes reading on another device, copying the data and formatting. If several compatible cards fail on the same drone, contact support with the results. Avoid persisting with formatting without understanding the cause.
If the recordings are important, stop the test
When irreplaceable files are missing, the priority becomes recovering them. Stop recording on that card and seek data recovery assistance before formatting it or continuing to experiment. Store it labelled so you do not accidentally put it back in the drone.
For normal use, organise a copying routine after each session. DJI explains in its guide to exporting photos and videos the available methods depending on the equipment, including card readers. A compatible card reader and a spare card are useful choices on your list of drone accessories (in Portuguese).
Sources consulted on 2 October 2026. The storage values are illustrative calculations, not results from a test of the equipment.
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