In the context of desktop and laptop motherboards, what does the designation M.2 represent?
A digital video connector intended to replace HDMI on portable computers.
A motherboard form factor designed for building ultra-small desktop computers.
A specification for internally mounted expansion cards and their edge-connectors, commonly used for SSDs and other modules that communicate over SATA or PCIe buses.
An external storage interface that uses a proprietary USB-C style cable.
M.2 is a specification that defines the physical form factor and edge-connector pin-out for internally mounted expansion cards. An M.2 slot on a motherboard can expose SATA, PCIe (often NVMe), and in some implementations USB buses, allowing devices such as SSDs, Wi-Fi adapters, or cellular modems to be installed without separate data- or power-cables. It is not a motherboard form factor, an external cabling standard, or a video interface. The correct option therefore identifies it as an internal expansion-card and connector specification; the other options mis-characterize it as a board size, external interface, or display port.
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What is the difference between M.2 and other SSD form factors?
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What is PCIe and why is it important for M.2 drives?
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What types of devices can connect using M.2 connectors?