Which solid-state drive (SSD) form factor is commonly used in ultra-portable devices such as ultrabook laptops and tablets because of its compact dimensions?
U.2 (SFF-8639)
2.5-inch SATA drive
M.2
PCIe add-in card
The M.2 specification (formerly NGFF) defines a very small printed-circuit-board form factor-typically 22 mm wide and 30 to 110 mm long-allowing SSDs to be mounted directly on a motherboard without cables. This space-saving design makes M.2 drives the standard choice for thin laptops and tablets. By contrast, 2.5-inch SATA drives and U.2 drives are bulkier, while PCIe add-in cards are intended for desktops.
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