M.2 Interface, Key and Socket explained
![M.2 Interface, Key and Socket explained](https://www.atpinc.com/upload/images/2022/05-10/62f88b9e3dfd4ce79adfcaaa8ed335ce.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://www.delock.de/infothek/M.2/images/62993_application_info.jpg)
The M.2 interface
![](https://i.ytimg.com/vi/-cofEwJ-2ek/maxresdefault.jpg)
NVMe PCIe SSD Adapter Installation and Speed Test - EZDIY-FAB Dual
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![](https://www.atpinc.com/upload/images/2021/04-22/f3945a51153443fbb2b5c9bbecc235e3.jpg)
M.2 Connector Guide on Keys and Sockets for SSDs
![](https://www.crucial.com/content/dam/crucial/ssd-products/p1/images/in-use/crucial-p1-inuse-install-image.psd.transform/small-jpg/img.jpg)
NVMe vs M.2 vs SATA vs PCIe: What are these SSDs?
![](https://upload.wikimedia.org/wikipedia/commons/thumb/6/68/SATA_Express_interface.svg/400px-SATA_Express_interface.svg.png)
M.2 - Wikipedia
![](https://www.delock.de/infothek/M.2/images/54081.jpg)
The M.2 interface
![](https://pinoutguide.com/images/upload/pinout_620015499_m.2%20keys.png)
M.2 (NGFF) connector pinout diagram @
![](https://www.delock.de/infothek/M.2/images/keys-a-e_klein_engl.jpg)
The M.2 interface
![](https://hackaday.com/wp-content/uploads/2022/10/hadimg_m2_basics_10.jpeg?w=400)
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![](https://www.partitionwizard.com/images/uploads/2020/10/m2-m-vs-bm-thumbnail.jpg)
M.2 M vs M.2 (B+M): What's the Difference? - MiniTool Partition Wizard
![](https://media.kingston.com/kingston/content/ktc-articles-solutions-pc-performance-2-types-of-m.2-ssd-section4.jpg)
2 Types of M.2 SSDs: SATA and NVMe - Kingston Technology