How to fix unable to eject disk in Terminal?

I have been having problems with my external hard drive. It has not been showing up under my “devices” in Finder, my desktop, or any other computers. It does indicate that it’s on and I think working because my hard drive blinks a little white light. I have been able to see it in “System Information > USB” with all of its information which I believe is a good sign. And when I go to Terminal it shows ups as well and I’m able to do the commands to get its info. But when I go to use a command like [diskutil eject disk_ (disk number it’s labeled under)], Terminal says “unable to find disk_” yet I know it exists as it’s literally displayed right above it. Does anyone know what the issue could be? It happens with other commands too like mount.

Best Answered by

Eudora Liu

Answered on Tuesday, August 27, 2024

There are many reasons that may cause your external hard drive not to show up on your Mac, for instance, the USB cable is broken, the external hard disk is formatted in an incompatible manner, etc.

Here are four methods for you to fix the external hard drive not showing up on Mac:

Check the connections
Check your Finder Preferences
Boot into Mac Safe Mode
Check the drive in Disk Utility

And then, when you type in the command you mentioned, the Terminal says "unable to find disk", that's may because your type in the wrong disk name, and you can try to use the following command to check your disk name first.

diskutil list

Write down your disk name and type in the following command to check whether your disk can be ejected properly. Don't forget to replace 'disk0s2' with your disk name.

diskutil umount force /dev/disk0s2