MacOS Sierra & WD Elements “Couldn’t Unmount Disk” Problem A tale of a brand new disk drive, a 2TB backup, a disk failure and finally a recovery… Share this:Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)