When I insert certain SD Cards, I get the message, ‘The disk you inserted was not readable by this computer’. The SD card is brand new and works fine on my digital camera. I’ve tried repairing and reformatting in Disk Utilities with no luck.
Here are sorts of solutions you can carry on to deal with the issue that “the disk you insert is not readable by this computer” since the culprits cause this notification vary. You can try them to make your SD card readable and writable on your machine:
Method 1: Do a basic troubleshooting
Method 2: Re-insert the external hard drive
Method 3: Update the drivers on your Mac
Method 4: Run First Aid to fix the unreadable disk
Method 5: Initialize the disk to repair the unreadable disk
Method 6: Ask a professional for Help
Method 7: Consider a replacement