After upgrading to High Sierra NTFS format mobile HDD fails to load I encountered a problem after upgrading to High Sierra. I have a mobile hard drive which is NTFS formatted (USB 3.0).

When I connect my hard drive to the computer, it doesn't appear in Finder. It can be found in the Disk Utility but it is grayed out. Mobile hard disk is working properly because in other windows computer connection is fine, before the upgrade (macOS 10.12) can also be displayed in finder.

Hardware: MacBook Pro 13 2017 16 GB RAM &amp; 256 GB SSD without Touch Bar.
I also have similar problem, but luckily, it can read the drives. Perhaps your drive was not mounted. Now I temporarily use virtual Windows through VirtualBox to write to the drives while waiting for a complete solution.

My machine is iMac late 2015.