the motherboard m.2 slot
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Buy from Scan - Akasa M.2 to SATA Adapter, 22x80, B and M Connector, Allows connection of SATA HDD/SSD via Motherboard/NUC M.2 Slot.
How Many PCIe Lanes Does M.2 Slot Use? - PC Guide 101
While traditional SATA SSDs can use both the 2.5” form factor and the M.2 slot on the motherboard, NVMe drives are compatible only with the M.2 slot.
How to Add More M.2 SSD Slots? - PC Guide 101
An M.2 expansion card plugs into the PCIe slot on your motherboard. ... An average commercial motherboard only has a single PCIe x16 slot, often used by the graphics card.