Situation 1. SD chip is dirty. Sometimes, there will be dust or dirt because of the careless protection for chips, thus your phone cannot read SD card. It is recommended to check that if the metal area is black or there is any spot on it.

An SMC Reset has been known to fix that problem. If you open System Information (Apple Menu > About This Mac > System Report) and look under Card Reader, what do you see? Try this with both a card inserted and no card inserted. If the card reader is recognized, you should see at least a Vendor ID, Serial Number, etc.

Check the Card Reader Use a spare SD card to test if the card reader can’t detect any card that’s plugged in. If you’re using an external card reader, you can try replacing the cables with a compatible substitute. Faulty cables can cause card readers to stop working properly.

[Solution] My SD Card not Working Test the SD card. If the SD card works with your device (e.g., can see pictures on the camera) but doesn’t work with your computer, it’s safe to assume the Built-in memory card reader. Some laptop computers and desktop computers have a built-in memory card reader. Checking the USB adapters. If you are trying to access the SD card using a USB card reader that connects to a USB port on the computer, try the suggestions See More….

Another frequent cause of SD card not working is a really easy one: a dirty SD card or even a card reader. Either will lead to a bad contact between reader and card. So the next thing that you should do is provide your card with a tidy, and eliminate any dust out of the reader, then try the card.

SD Card Not Reading FAQ Check the Card reader. Try using a different USB port. Restart PC. Check write-protection. Format the SD card. Purchase a new SD card as a replacement