The M.2 form factor is a small, internally mounted expansion-card format that plugs directly into a dedicated M.2 slot on the motherboard. It was designed to replace older mSATA and Mini-PCIe solutions and can carry several different interfaces, most commonly SATA and PCIe (including NVMe).
One incorrect statement is that M.2 is an expanded Mini-PCIe interface intended primarily for legacy upgrades, which is not true.
Another incorrect statement is that DIMM refers to memory modules with specific dimensions that have no relation to M.2.
Finally, it is also inaccurate to describe M.2 as a host-controller interface designed exclusively for hard-disk or optical drives.
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What are the main advantages of using the M.2 form factor for storage?
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How does the connectivity of M.2 differ from traditional SATA connections?
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Can M.2 be used in desktop computers, or is it only for laptops?