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Difficulty: MediumStorage Devices and Interfaces

A field technician is upgrading the storage in a desktop computer. The motherboard documentation states that the dedicated M.2 slot is wired exclusively with PCIe 3.0 x4 lanes and does not support SATA signaling. The technician installs an M.2 SATA SSD into this slot. Which of the following outcomes should the technician expect when powering on the workstation?

  1. The SSD will not be detected in the BIOS/UEFI setup because the M.2 slot lacks SATA bus routing.Answer
  2. B
    The SSD will function properly but will be throttled to single-lane PCIe 3.0 transfer speeds.
  3. C
    The system motherboard will automatically configure the M.2 slot controller to AHCI mode to recognize the drive.
  4. D
    The SSD will be recognized in the BIOS/UEFI, but the operating system will require custom NVMe drivers to mount the volume.

Answer

The SSD will not be detected in the BIOS/UEFI setup because the M.2 slot lacks SATA bus routing.
Although the M.2 form factor is standardized, individual motherboard M.2 slots vary in their underlying bus routing. An M.2 slot configured strictly for PCIe (NVMe) lanes lacks physical trace connections to the motherboard's SATA controller. Consequently, installing an M.2 SATA drive into a PCIe-only slot prevents the drive from communicating with system firmware, making it undetected in BIOS/UEFI.

Step-by-Step Solution

1
Identify the drive interface protocol and slot specification.
The drive relies on the SATA protocol, while the motherboard M.2 slot provides only PCIe signals.
M.2 is a physical form factor, but individual slots can support PCIe (NVMe), SATA, or both depending on motherboard wiring.
2
Evaluate bus compatibility between the drive and the slot.
Because SATA signaling traces are absent from the PCIe-only slot, no physical signal link can be established.
Without a physical pathway to a SATA host controller, the system cannot communicate with the SATA drive.
3
Determine the system state upon boot.
The system hardware cannot detect the drive during POST.
The drive remains completely unlisted in the system BIOS/UEFI firmware.

Key Concept

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

Storage Devices and Interfaces

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