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Difficulty: HardStorage Devices and Interfaces

A technician is configuring a desktop motherboard that features two distinct M.2 slots: Slot 1 is keyed exclusively for M-key drives and connects directly to CPU PCIe lanes (PCIe mode only), while Slot 2 supports both SATA and PCIe 3.0 x2 modes with B&M keying via the motherboard chipset. The technician has one M.2 SATA drive and one M.2 NVMe PCIe 4.0 drive to install. Which of the following statements correctly describe the hardware compatibility and performance outcomes of this installation? (Select TWO.)

  1. Installing the M.2 SATA drive into Slot 1 will prevent the drive from being detected, as Slot 1 does not route signals to a SATA controller.Answer
  2. Installing the M.2 NVMe drive into Slot 2 will restrict its maximum bandwidth due to the slot's limited lane count and chipset bus connection.Answer
  3. C
    The M.2 NVMe drive will automatically switch to AHCI protocol mode when installed into Slot 2 to ensure compatibility with SATA devices.
  4. D
    An M.2 SATA drive with B&M keying can be accommodated in Slot 1 by changing the storage controller mode from NVMe to AHCI in the UEFI settings.

Answer

The correct statements are that installing the M.2 SATA drive into Slot 1 will prevent drive detection because Slot 1 lacks SATA controller routing, and installing the M.2 NVMe drive into Slot 2 will limit its performance due to fewer PCIe lanes and chipset bus constraints.
Slot 1 is wired strictly for PCIe lanes from the CPU and lacks connections to the system SATA host controller, meaning any M.2 SATA drive inserted will not be detected by the system. Slot 2 operates over PCIe 3.0 x2 lanes connected through the chipset, which limits an NVMe PCIe 4.0 x4 drive to PCIe 3.0 x2 bandwidth limits.

Step-by-Step Solution

1
Analyze Slot 1 specifications and M.2 SATA drive requirements.
Slot 1 supports PCIe mode only. An M.2 SATA drive requires SATA controller signaling, so it will not be detected in Slot 1.
M.2 slots must be wired to a SATA host controller to support SATA-protocol drives, regardless of physical keying.
2
Analyze Slot 2 specifications and M.2 NVMe drive requirements.
Slot 2 supports PCIe 3.0 x2 via the chipset. An NVMe PCIe 4.0 drive installed here will function but will be bottlenecked by fewer lanes and lower PCIe generation speed.
PCIe standards are backward-compatible, but bandwidth is capped at the lowest common denominator of lane count and generation speed.
3
Evaluate distractor claims regarding AHCI switching and UEFI override.
NVMe protocol does not convert to AHCI mode, nor can UEFI settings add hardware SATA wiring to a PCIe-only slot.
Protocol and hardware bus support are determined by drive architecture and motherboard physical traces.

Key Concept

M.2 Form Factor vs. Protocol and Bus Signaling Compatibility
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Topics

Storage Devices and Interfaces

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