The correct statement is that M.2 is a small form factor for internally mounted expansion cards that provides both SATA and PCIe connectivity options. The M.2 form factor is valued for its compact size, making it ideal for space-constrained devices like laptops and modern motherboards. The other options are incorrect: M.2 is a modern standard that succeeded mSATA, not an interface primarily for legacy devices. It is a storage and expansion card form factor, completely different from a DDR4 DIMM memory module. Lastly, it is designed for solid-state devices and other expansion cards, not exclusively for hard disk drives or optical drives.
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What is the difference between SATA and PCIe connectivity options in the context of M.2?
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Why is the M.2 form factor preferred for laptops and systems with limited space?
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Can M.2 devices be used in desktops, and how does their installation differ from traditional storage drives?