So, how to fix AppleAPFSMedia not mounted issue? How to avoid data loss if AppleAPFSMedia won't mount? How to fix AppleAPFSMedia not mounted without data loss? It can get corrupted too and can't be mounted sometimes. The disk is called AppleAPFSMedia, using the same physical storage place as the added APFS container. Whenever you add an APFS container, the operating system creates a virtual disk. I really need to open this partition as my working files stores in it. When I open Disk Utility, it showed as unmounted. I can't open AppleAPFSMedia on my MacBook using High Sierra.
