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Difficulty: MediumStorage Devices and Interfaces

A technician installs a new 1 TB M.2 PCIe NVMe solid-state drive into a secondary M.2 slot on a motherboard. According to the motherboard documentation, the secondary M.2 slot routes exclusively to the SATA controller and does not support PCIe lanes. When the system is powered on, the drive is not detected in the BIOS/UEFI configuration utility. Which of the following is the MOST likely cause of this issue?

  1. The motherboard slot lacks the PCIe data bus connectivity required for NVMe drives to operate.Answer
  2. B
    The BIOS/UEFI SATA controller mode must be toggled from AHCI to IDE to enable NVMe backward compatibility.
  3. C
    The NVMe drive requires a vendor storage driver update before the system POST can recognize its physical bus speed.
  4. D
    The drive must be partitioned and formatted with a file system before it can be enumerated by the system BIOS.

Answer

The motherboard slot lacks the PCIe data bus connectivity required for NVMe drives to operate.
While M.2 defines the physical form factor, NVMe drives specifically require PCIe lanes to communicate with the system. Installing an NVMe drive into a slot wired exclusively for SATA signals prevents hardware detection at POST.

Step-by-Step Solution

1
Identify the protocol requirements of the installed drive.
The installed drive is an M.2 PCIe NVMe SSD, which requires active PCIe bus lanes for power and signal communication.
NVMe drives communicate via the PCIe interface standard.
2
Analyze the slot specifications provided by the motherboard documentation.
The secondary M.2 slot only routes to the SATA controller and lacks PCIe lane connections.
M.2 is a physical form factor, not a protocol. Motherboard slots can support SATA, PCIe (NVMe), or both.
3
Determine why hardware enumeration failed during POST.
Because the NVMe drive cannot communicate over SATA-only signal lines, the system BIOS/UEFI cannot detect or enumerate the drive.
An NVMe drive cannot function without a compatible PCIe interface connection.

Key Concept

Distinguishing M.2 Physical Form Factor from NVMe and SATA Bus Protocols
Estimated Time:1m 0s
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Topics

Storage Devices and Interfaces

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