
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
