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Difficulty: MediumStorage Devices and Interfaces

A technician is upgrading a system by replacing an older M.2 SSD with a high-performance M.2 NVMe PCIe SSD. After installing the new drive into the existing M.2 slot and powering on the machine, the drive is not detected by the UEFI/BIOS. System documentation confirms that the M.2 slot physically accepts the drive but only connects to the SATA host controller. Which of the following best explains why the new drive is not functioning?

  1. The M.2 slot lacks PCIe lane connectivity required for NVMe protocol communication.Answer
  2. B
    The system motherboard requires AHCI host controller mode to be enabled to auto-detect NVMe drives.
  3. C
    NVMe solid-state drives require an external SATA power cable when installed in motherboard expansion slots.
  4. D
    All M.2 SSD form-factor drives natively support both SATA and NVMe transmission standards regardless of slot bus routing.

Answer

The M.2 slot lacks PCIe lane connectivity required for NVMe protocol communication.
M.2 defines the physical card dimension and connector layout. However, the signals routed to an M.2 connector depend on motherboard design. If an M.2 socket is routed only to SATA lines, an NVMe drive (which requires PCIe lines) will not be recognized by system firmware.

Step-by-Step Solution

1
Identify the physical form factor and logical interface protocols.
The physical slot is M.2, but the logical protocols available on M.2 slots can be SATA, PCIe (NVMe), or both depending on motherboard wiring.
M.2 is a physical form factor specification, not a transfer protocol.
2
Analyze slot compatibility constraints.
If an M.2 socket is wired only to the SATA controller, it does not provide the PCIe lanes needed by an NVMe SSD.
NVMe drives communicate exclusively over the PCIe bus.
3
Determine why the NVMe SSD is not detected.
Because the slot lacks PCIe connectivity, the NVMe SSD cannot establish a link with the host system.
Without PCIe lane routing to the M.2 slot, the system hardware cannot communicate with the drive.

Key Concept

M.2 Bus Interfaces and Protocol Compatibility (SATA vs NVMe)
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Topics

Storage Devices and Interfaces

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