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You will recognize M.2 SSD: why some M.2 SSD have two notches? – EGLOBAL Mini PC Tech Support Blog
Connect a M.2 (B & M) key SSD into a B socket - Super User
How do I install an M.2 SSD on my computer? - Transcend Information, Inc.
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Can You Insert Your M.2 Drive Into the PCIe Slot? (Does It Fit?!) - Tech Overwrite
M.2 - Wikipedia
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