
The SSD is greyed out in Disk Utility's left sidebar and shows Not Mounted in the right pane.

The external SSD may not be mounted on Mac if your SSD hard drive is missing from any of these locations. For your convenience, your Mac usually displays the mounted storage device on the desktop and in the Finder. The mounted storage device's directory entry typically appears in the /Volumes directory on macOS. In other words, your SSD must be mounted to be used on a Mac for data storage and transfer. After that, the file system's contents are accessible to you and the applications. To mount an external SSD on Mac, the macOS creates a directory entry for the SSD when you attach it to your computer, making the SSD's file system accessible to the operating system. How to fix an SSD that won't mount on Mac? Back up important files from the unmounted Mac external SSD The solutions described in this article apply to all SSD drive brands, including SanDisk, Crucial, Western Digital, Seagate, and Samsung.

By following the solutions, you will make your Mac mount the SSD successfully without any data loss. Don't worry, this passage will troubleshoot SSD not mounting on Mac issue for you. It can be so frustrating when your Mac won't SSD as you cannot use it at all. Unlike the internal SSD not mounting on Mac, this issue usually happens to an external SSD. I've been using my SanDisk Extreme Pro v2 for video editing, but now I can't see any of the files on it and it only appears in the disk utility, not my desktop or Finder.
