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Definition: M.2


A small expansion card that holds a solid state drive (SSD) or communications controller such as Wi-Fi or Bluetooth. Due to their compact size, M.2 cards were initially deployed in laptops and tablets but later migrated to desktop computers. Modern motherboards include M.2 sockets, and adapters retrofit older computers (see below). Originally known as the Next Generation Form Factor (NGFF), M.2 supports PCI Express (PCIe), USB, SATA and other interfaces. See U.2, PCI Express, mSATA and Mini PCI Express.




NVMe on M.2
This 80x20mm M.2 card contains a 960GB NVMe SSD. M.2 cards containing an NVMe SSD that connect via PCIe are increasingly popular. The pen is for size comparison. See NVMe.






SATA SSDs on mSATA and M.2 Cards
The 480GB SATA SSD (top) is on an mSATA card. The 960GB SATA SSD (bottom) uses the M.2 format, which has replaced mSATA in new products.






M.2 Sockets On the Motherboard
Modern desktop PC motherboards have dedicated M.2 slots as in this Asus example. This is looking down between the graphics card and heat sink.






Key IDs
M.2 has 12 plug and socket "key" configurations to ensure that the motherboard supports the interface on the card. The M and B keys are the most popular.






No M.2 Motherboard Sockets?
No problem. Insert the M.2 card into an adapter that plugs into a PCI Express (PCIe) slot on the motherboard. M.2 cards are 22mm wide by 30, 42, 60, 80 and 110mm long. After insertion, the card is bolted to the adapter (or motherboard) using the hole at the far end. See PCI Express.