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Difficulty: EasyStorage Devices and Interfaces

A technician installs a new M.2 PCIe NVMe solid-state drive (SSD) into a desktop motherboard's M.2 slot. Upon powering on the computer, the system BIOS fails to detect the drive. The motherboard manual confirms that the specific slot supports only M.2 SATA drives. Which of the following best explains why the drive is not recognized?

  1. The M.2 slot connects only to the SATA bus controller and cannot process PCIe NVMe data signals.Answer
  2. B
    The M.2 NVMe drive requires an auxiliary 15-pin SATA power cable connected directly to the motherboard.
  3. C
    The technician must enable legacy AHCI mode in the BIOS to allow PCIe NVMe drives to operate over SATA traces.
  4. D
    M.2 solid-state drives automatically convert PCIe protocol signals into SATA interface signals when plugged into legacy motherboard slots.

Answer

The M.2 slot connects only to the SATA bus controller and cannot process PCIe NVMe data signals.
While M.2 defines the physical dimensions and connector pin layout, the underlying data transfer protocol depends on motherboard slot wiring. If an M.2 slot connects strictly to a SATA controller, it lacks the PCIe bus routing required by an NVMe drive, rendering the drive invisible to the system BIOS.

Step-by-Step Solution

1
Differentiate physical form factor from data transport protocols.
M.2 is a physical card connector standard, whereas SATA and NVMe (PCIe) are distinct data protocols.
A physical fit in an M.2 socket does not guarantee that the motherboard slot routes the compatible electrical signals.
2
Evaluate the motherboard's slot capabilities.
The target M.2 slot routes only SATA controller channels.
An NVMe SSD requires PCIe bus lanes to communicate with the CPU and system controller.
3
Determine the cause of system detection failure.
Because no PCIe lanes are routed to the slot, the BIOS cannot interface with the NVMe SSD.
Protocol mismatch between drive and slot leads to complete non-detection.

Key Concept

M.2 Form Factor vs. SATA and NVMe Protocol Bus Compatibility
Estimated Time:45s
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Topics

Storage Devices and Interfaces

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