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Difficulty: MediumStorage Devices and Interfaces

A technician is installing a secondary 1 TB M.2 solid-state drive into a system. The motherboard documentation states that the designated secondary M.2 socket operates exclusively over the PCIe bus to support the NVMe protocol. The technician physically installs an M.2 solid-state drive that uses the SATA protocol into this socket and powers on the system. Which of the following is the most likely outcome of this configuration?

  1. The drive will not be recognized in the system BIOS/UEFI because the socket lacks motherboard controller pathways for the SATA protocol.Answer
  2. B
    The drive will be detected successfully but its data transfer rate will be restricted to SATA III throughput limits of 6 Gbps.
  3. C
    The drive will automatically emulate NVMe protocol commands to achieve full compatibility with the PCIe bus.
  4. D
    The drive will function normally for system storage but will prevent the computer from entering ACPI sleep states.

Answer

The drive will not be recognized in the system BIOS/UEFI because the socket lacks motherboard controller pathways for the SATA protocol.
While M.2 defines the pin layout and physical card dimensions, storage communication requires a supported bus protocol. An M.2 slot designed exclusively for PCIe/NVMe does not connect to the system SATA host controller. Consequently, an M.2 SATA drive placed in a PCIe-only M.2 slot cannot establish electrical communication with the controller and will not be detected by the system BIOS/UEFI.

Step-by-Step Solution

1
Identify the physical form factor versus the logical bus protocol.
The drive physical module is M.2, but its logical protocol is SATA.
M.2 is a physical form factor specification, whereas SATA and NVMe (PCIe) are separate bus communication protocols.
2
Analyze motherboard slot interface routing specifications.
The motherboard slot is connected solely to PCIe lanes.
If an M.2 slot is specified as PCIe/NVMe-only, it has no signal connections routed to a SATA host controller.
3
Determine system detection behavior.
The drive fails to communicate with the system.
Because no SATA signal pathways exist on that specific socket, the BIOS/UEFI cannot detect or initialize the SATA drive.

Key Concept

M.2 SATA vs. NVMe Protocol Compatibility
Estimated Time:1m 15s
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Topics

Storage Devices and Interfaces

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