Thanks AlphaPolak - that explains the WD Green then needing to be moved.
No, there's nothing in the manual about RAID and M.2 - have read and re-read it a number of times. Since my post though I was able to find a couple of posts on Tom's Hardware appearing to experience the same issue - BOIS dropping the M.2 if RAID was enabled, this is on both Z97 and X99 boards.
Seems really odd if it's 'normal' behaviour and I would have expected it to be more up-front if truly a thing - M.2 and RAID are both quite prosumer/enthusiast setups, so I would have thought this outcome quite common.
martin.dutton got a reaction from AlphaPolack in Samsung 950 Pro M.2 boot issues if RAID is enabled
