Looks like the data on the partitions is all intact, it's just having trouble booting into them. I can rebuild from scratch if I need, but I'm more curious in if tools exist that can alleviate crossing the gap between hfs, ntfs, and ext4.
On first startup of Mounty, you probably need to accept a bunch of security-related settings:
We have seen that certain third-party NTFS tools will re-name the volume kind property of an NTFS drive to something other than "ntfs". In this case it might happen that the macOS kernel driver ist not able to re-mount in read/write mode anymore. Thanks to Giovanni for his patience to reveal this issue during a remote debug session :)
This problem is happening because windows can't recognize the partition with high sierra on it.
When Apple updated to the new os, they switched to a new file system called APFS.
Unfortunately windows can't recognize a partition with this file system on it. For now you'll have to switch by holding down the option key at startup and selecting the os you want from there.
You can still select windows from the startup disk options in system preferences from mac os, but you'll have to use the hold option method to move back to mac from the windows side.
Download and install the latest FUSE for macOS, this will add a new preference pane but no configuration is needed. The app make it possible for other software to extend the capabilities of the filing system such as ntfs-3g
At this point you need to change the mount_ntfs file, the new file will allow the writes to NTFS disks, these commands will back up the original and then link to the modified mount_ntfs file as supplied by Brew/ntfs-3g
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