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Difficulty: MediumMotherboards Form Factors and Connectors

A technician is installing a high-performance PCIe x4 NVMe M.2 solid-state drive into an M.2 connector on a motherboard. Although the drive fits physically into the slot, the system's UEFI/BIOS fails to detect the storage device during POST. The technician reviews the motherboard manual and notices that the specific M.2 slot is designated for SATA protocol only. Which of the following best explains why the drive is not functioning?

  1. The M.2 connector on the motherboard lacks the required PCIe bus wiring for NVMe data transfer despite sharing a physical form factor format.Answer
  2. B
    The M.2 NVMe drive requires an auxiliary 24-pin ATX power connection from the power supply to activate its high-speed transfer lanes.
  3. C
    The drive must be installed in an SO-DIMM adapter socket to bridge the motherboard bus protocol differences on standard desktop motherboards.
  4. D
    The motherboard requires two identical M.2 drives populated in adjacent slots to initiate dual-channel NVMe storage mode.

Answer

The M.2 connector on the motherboard lacks the required PCIe bus wiring for NVMe data transfer despite sharing a physical form factor format.
The correct option correctly identifies that while M.2 defines the physical size and connector format, motherboard M.2 slots are individually wired to specific bus protocols. An M.2 slot wired solely for SATA cannot communicate with an NVMe drive that relies on PCIe controller lines.

Step-by-Step Solution

1
Analyze the physical and logical interfaces described in the scenario.
Identified that the M.2 NVMe drive fits mechanically, but the motherboard documentation states the slot is wired strictly for the SATA protocol.
M.2 slots specify physical shape and keying, but the underlying data lines connected to the slot determine protocol compatibility (PCIe vs. SATA).
2
Evaluate the cause of non-detection in UEFI/BIOS.
An NVMe drive relies on PCIe lanes to communicate with the host controller. Because the slot only provides SATA bus communication lines, the NVMe drive cannot be recognized.
Physical compatibility does not guarantee electrical protocol compatibility on motherboard expansion slots.

Key Concept

M.2 Form Factor vs. Storage Protocols (SATA vs. NVMe)
Estimated Time:1m 15s
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Topics

Motherboards Form Factors and Connectors

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