M.2 Interface, Key and Socket explained
![M.2 Interface, Key and Socket explained](https://www.atpinc.com/upload/images/2020/04-22/744842941ae746b3a9229451cc84b809.jpg)
An M.2 SSD is “keyed” to prevent insertion of a card connector (male) to an incompatible socket (female) on the host. The M.2 specification identifies 12 key IDs on the module card and socket interface but M.2 SSDs typically use three common keys: B, M, and B+M
![](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/M.2_connector_on_a_computer_motherboard.jpg/350px-M.2_connector_on_a_computer_motherboard.jpg)
M.2 - Wikipedia
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iDsonix SSD Case M.2 NVMe SATA 4TB Enclosure Dual Protocol Case NVMe PCIe External Hard Drive Box Uasp, Size: 2 in, Gray
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What is an M.2 SSD?
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The M.2 interface
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The M.2 interface
![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/M2_Edge_Connector_Keying.svg/350px-M2_Edge_Connector_Keying.svg.png)
M.2 - Wikipedia
![](https://i.stack.imgur.com/sQqkJ.png)
pcie - M2 Key E - can it host an NVMe SSD? - Electrical Engineering Stack Exchange
![](https://ae01.alicdn.com/kf/S93f8e24ec670487e86eda8c672bcdf52X/1-10pcs-Ngff-M-2-Socket-outlet-SSD-interface-67Pin-M-KEY-H3-2-4-5.jpg_960x960.jpg)
1-10pcs Ngff M.2 Socket outlet SSD interface 67Pin M KEY H3.2 4+5 Solid State Hard Disk interface SSD FPC Connector - AliExpress
![](https://www.assured-systems.com/wp-content/uploads/Understanding-M2-Keys-and-Sockets-for-Industrial-SSDs.jpg)
Understanding M.2 Keys and Sockets for Industrial SSDs - Assured Systems
![](https://www.pugetsystems.com/wp-content/uploads/2022/10/M.2_key.jpg-32529.jpg)
Overview of M.2 SSDs