I recently installed Windows 10 on my Mac. The partitions are as follows: 128MB SSD (HFS+, boot device), 3TB HDD (2TB HFS+ for Mac, 1TB NTFS with Win 10) After booting into Win 10, i can see the 1TB NTFS partition (drive c and the SSD (drive d, but the 2TB partition doesn't get a letter. In the device manager the partition is active, so why is it not mounted properly? File vault is deactivated on the Mac side. Booting with Sierra, there are no issues with the partitions. SSD/HDD were arranged as a fusion drive once, but i split them almost 2 years ago without issues since then, so that can't be the reason. Any ideas?