I connect my SD card to my 2020 MacBook Air via a micro USB convertor. I could access and used the SD card well until I accidentally slightly bumped the USB convertor. Now, a message says that the disk I have inserted is unreadable by this computer. I have tried to connect the SD card on every computer in my house, it is still unreadable. How can I access the files on my SD card?
Since you receive the error “The disk you’ve inserted is unreadable by this computer”, it indicates that your Mac has detected the SD card. So, I guess that the SD card and your convertor don’t have the hardware damage. Try changing an SD card reader.
Maybe due to your frequent usage, the SD card is corrupted and becomes unreadable. In this case, to access files on the SD card, you need a data recovery tool. I’ve used iBoysoft Data Recovery for Mac before to recover files from my inaccessible external hard drive. This tool also supports restoring files from inaccessible, corrupted, or unreadable SD cards.
You can Download iBoysoft Data Recovery for Mac and let it help you rescue files on your unreadable SD card with on-screen instructions.
How do you connect the SD card to other Mac computers in your house? If you use the same USB converter, I think the key point of the problem is the converter. Your slight bump may make the converter damaged.