Hi, I just updated from Win 8.1 to Win 10. Seemed to have worked as it should. But I discoverd I cannot acces my D: partition anymore; I get an notification saying the drive is unreadable and has to be formatted. The partition is located on my Main SDD, together (obviously) with my C: boot partition, which is working fine.
It is not a big loss at itself (D: is only used to install programms), but it's annoying and also quite disturbing...

Anyone got a clue what's going on here?