Try free Check whether the drive is properly plugged in While it’s impossible to instantly figure out why an external disk drive is not showing up, there are some working methods that will help you get things right.
How to fix an external disk drive that won't show up on a Mac With M1 chips, the threat is very real due to the fact that it’s impossible to boot your Mac if your internal SSD fails.
Most of the time, when you connect an external hard drive to your Mac’s USB port, you soon see it mount on the desktop. Disk Drill brings deleted files back from the dead.