My Windows boot just updated the other day, and I lost connectivity to the Mac OS drives. I upgraded to Sierra about a month ago. Using other posts, I can confirm that FileVault is off and I am not using CoreStorage (did the check). When I boot to Windows, the disk Management CAN see the partitions themselves. I posted a screenshot. Disk 0 is my standard HDD, partitioned into a Mac and Bootcamp sides. Disk 1 is my SSD for MacOS.
If you right click on the drives themselves, all options, save delete, are grayed out. I use that Disk 0 partition as the storage dump for both boots. I really need to get back in there natively.
If you right click on the drives themselves, all options, save delete, are grayed out. I use that Disk 0 partition as the storage dump for both boots. I really need to get back in there natively.