There may be multiple reasons for the failure of the car navigation system to detect the storage card, including but not limited to the following:

Memory card damage: When a memory card is damaged, it will be unable to store data, causing the recorder to be unable to recognize the memory card during detection and stop working. Suggest trying to replace it with a new memory card to see if it works properly. ‌

Poor contact issue: Sometimes the contact between the SD card and the vehicle interface may not be tight, resulting in the SD card not being read correctly. You can try unplugging and reinserting the SD card, and restarting the navigation screen to ensure that the SD card can be read correctly.

Navigation or SD card issue: You can try formatting the SD card (recommended to use FAT32 format) and try copying the data again. Meanwhile, the metal areas on the SD card may experience poor contact due to dust or oil contamination, and you can try cleaning these areas.

SD card installation issue: If the SD card is not installed properly in the card slot, it may cause poor contact, making it impossible for the dash cam to detect the SD card. At this point, you need to unplug the SD card and reinstall it to ensure it is fully inserted into the card slot.

There may be many reasons why the car navigation system cannot read the SD card, one of which is that the SD card itself is damaged. If the problem persists after replacing the SD card, it may be necessary to consider checking other components of the car navigation system or seeking professional repair services.

In short, solving this problem usually requires troubleshooting and adjustment from multiple aspects such as the SD card itself, installation method, and the functionality of the navigation system. If the problem cannot be solved by oneself, it is recommended to contact professional repair services.