I'm having trouble setting the windows 10 file history drive. The drive I'm trying to use is Y: on disk 4 in the disk management image attached, which shares a 4TB hdd with another two partitions. It uses GPT and is a dynamic disk. All partitions are formatted as NTFS. When I go to file history and attempt to set the drive, only another partition on a different hdd is selectable which I would prefer to not use.
I was able to use this drive for file history up until I reinstalled windows 10 recently, where I formatted down to windows 7 from windows 10 tech preview, then upgraded to windows 10 to activate my old win 7 key. This was done after a recent major hardware upgrade (motherboard/cpu/ram). The 4TB hdd wouldn't have been touched by any of the windows installation procedures and I haven't set any page or hybernation files to it. The only difference is that it's plugged into a different motherboard. The old motherboard was a Gigabyte GA-980FXA UD5 (rev 2101) and the new one is a Gigabyte Z170X-Gaming GT G1 (rev 1).
I've had a look around on the web, and solutions have asked to remove any folders on the partition from libraries, which I have done as far as I can tell, with no success (there weren't any in the first place, but there were some on the other partitions which I've removed). Another solution was to share the partition with full read/write access to everybody. This did work, but it seems like terrible work around rather than a fix.
I'm guessing this might have something to do with the GBT/dynamic nature of the disk, but if that was the case then it shouldn't have worked before the reinstalls as it should still be the same.
Advice would be appreciated. Thanks