Originally Posted by
rkrams Secondary HDD containing my back up file vanished on AU update!
It shows up as unallocated space in partition manger!
were *** appears fully functional on win 8.1 i have on the same pc and before anyone asks NO i dont have any os partition on the secondary HDD!
really bummed about this as most of my files are on the secondary HDD that i use frequently!
I had this problem with my external 2TB hard drive and wrote about it
here. Windows doesn't recognize the drive and when I open the Disk Management the disk shows up as "unallocated" as if all data is gone. It was obviously a WTF moment but luckily in my case (I hope yours too), disk was still intact, it's just Windows fails to recognize it. Mine was external drive so it was easy to verify this by plugging it into another PC without AU. Mine was just a File History target drive so I just reformatted it to use it again.
Is your drive also Bitlocker enabled like mine was? I wonder if it's specific to Bitlocked drives...
There is a number of people reporting this issue in Feedback Hub. MS really should fix this before pushing AU to everyone. It's a scary bug and will cause a lot of grief.