

You can mount and unmount drives, volumes, and disks from the command line of MacOS and Mac OS X.

It could be that your Mac already recognizes the device, but just isn’t showing its icon on the desktop screen. Mac not formatted to display external drives on the desktop. For more information, go to the same menu option, then select System Report. I tried a number of things: mounting/unmounting in Disk Utility (both in regular mode and repair mode), mounting/unmounting via Terminal, restarting my computer, trying to mount the drive on another computer and suddenly the drive mounted and became accessible. Well, my drive now appears to be working.
#Unmount disk mac terminal how to#
But don’t worry, this page talks about the reasons for this issue, and how to fix “USB flash drive not mounting on Mac” without data loss even if external hard drive is not showing up on Mac. However, if the USB flash drive is not mounted on Mac, you will lose access to the USB flash drive as well as to the data stored on it. What’s worse, your Mac computer will stop working, or. If the Macintosh HD, the internal hard drive of Mac, won’t mount in Disk Utility, all the data on the Mac hard drive becomes inaccessible, and most of the operations are greyed out or disabled except the Erase button. In this case, your last chance is to reset the Macso as to make the Mac computer work again. If you still can’t mount the internal hard drive on your Mac, there might be serious directory structure or file system corruption in the disk. Video taken from the channel: The Mac Helper
