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Difficulty: MediumMotherboards Form Factors and Connectors

A technician is installing an M.2 solid-state drive into an M.2 connector on a motherboard. The motherboard documentation specifies that this particular M.2 slot is wired internally for the SATA bus protocol only. If the technician installs a PCIe-only NVMe M.2 drive into this slot, which of the following will occur?

  1. The drive will not be recognized by the system BIOS/UEFI.Answer
  2. B
    The drive will be recognized but will operate at standard SATA III speeds (6 Gbps6\text{ Gbps}).
  3. C
    The motherboard will halt POST with a beep code indicating a memory channel configuration error.
  4. D
    The system power supply will trip its over-current protection circuit upon startup.

Answer

The drive will not be recognized by the system BIOS/UEFI.
While an M.2 NVMe drive may physically fit into an M.2 slot, motherboard slots wired strictly for the SATA protocol lack the necessary PCIe trace lines. Without PCIe bus connections, the host controller cannot communicate with the NVMe drive, rendering it completely unrecognized by the BIOS/UEFI.

Step-by-Step Solution

1
Analyze the bus protocol supported by the motherboard's M.2 slot.
The slot is connected electrically only to the SATA bus controller.
M.2 connectors can be routed to PCIe lanes, SATA controller traces, or both depending on motherboard design.
2
Identify the requirement of the installed M.2 drive.
The drive is a PCIe-only NVMe storage module requiring active PCIe bus lanes.
NVMe drives lack legacy SATA host controller signaling hardware.
3
Determine the functional outcome of the protocol mismatch.
The host system fails to detect the storage module during initialization.
Without PCIe signal routing to the slot, the drive cannot transmit data to the host system and remains unlisted in BIOS/UEFI.

Key Concept

M.2 Bus Protocol Compatibility
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Topics

Motherboards Form Factors and Connectors

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