もち
マザボ：MSI H270 TOMAHAWK ARCTIC DETONATOR EDITION
M.2：SSDPEKKW256G8XT
https://jp.msi.com/Motherboard/H270-TOMAHAWK-ARCTIC-DETONATOR-EDITION/Specification
マザボ的には
2 x M.2 slots (Key M)
- Support up to PCIe 3.0 x4 and SATA 6Gb/s
と言ってるので、KeyB+M問題とかではないと思うんですが・・・
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