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Difficulty: HardStorage Devices and Interfaces

A technician is attempting to upgrade an older corporate laptop with a new M.2 2280 solid-state drive (SSD). The laptop's technical specifications state that its internal M.2 slot is B-keyed and routed exclusively to an internal SATA III controller. The technician inserts an M-key PCIe NVMe M.2 SSD into the expansion slot using a physical adapter, but the drive fails to register in the UEFI/BIOS system setup screen. Which of the following is the most likely cause of this issue?

  1. The motherboard slot interface provides only SATA bus connectivity, which cannot communicate with an NVMe PCIe protocol drive.Answer
  2. B
    The technician forgot to enable AHCI mode in the UEFI settings prior to physically seating the NVMe drive.
  3. C
    The system RAM must be reconfigured into dual-channel mode to allocate bandwidth for the NVMe controller.
  4. D
    The technician bypassed the required troubleshooting step of clearing the CMOS before performing any storage hardware installation.

Answer

The motherboard slot interface provides only SATA bus connectivity, which cannot communicate with an NVMe PCIe protocol drive.
Although the M.2 form factor provides a standard card-edge interface, the underlying protocol (SATA vs. NVMe/PCIe) must be supported by the motherboard slot. A slot wired exclusively to a SATA III controller lacks the PCIe lanes required for an NVMe SSD to be initialized and recognized by the system UEFI.

Step-by-Step Solution

1
Analyze the hardware specifications provided in the scenario
Identified that the laptop M.2 slot is wired only to the SATA III controller (B-key configuration).
M.2 slots can carry different bus signals (SATA vs. PCIe) depending on motherboard implementation.
2
Evaluate drive protocol compatibility against slot bus capabilities
Recognized that NVMe SSDs require PCIe lanes to function and cannot operate over a purely SATA bus.
Physical mechanical conversion via adapters does not convert underlying bus protocol signals.
3
Determine the root cause of the UEFI recognition failure
Selected the option stating that the SATA bus interface cannot communicate with an NVMe PCIe protocol drive.
Without PCIe connectivity to the M.2 slot, the NVMe host controller on the SSD cannot communicate with the motherboard.

Key Concept

M.2 Interface and Protocol Compatibility (NVMe PCIe vs. SATA)
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Topics

Storage Devices and Interfaces

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