Solution:
1, SD card is broken.
2, SD card is not formatted, requires formatting, this format can be.
3, USB is not installed driver, this situation is relatively small, you can install the driver (please install the official system card reader driver provided correctly).
4, the card reader may be broken, replace the card reader. It may also be that the data cable is broken, and the data cable can be replaced.
5, the computer has a USB flash drive prompt, can not find the U disk, click on my computer & mdash; management & mdash; disk management, you can find.
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