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Difficulty: MediumStorage Drives and RAID Array Issues

A system technician installs a new high-performance M.2 PCIe NVMe solid-state drive (SSD) into an open M.2 slot on a workstation motherboard to expand storage. After powering on the computer, the system boots into the operating system normally, but the new drive is not listed in Disk Management or Device Manager. The technician verifies that the drive is seated correctly and firmly secured with the standoff screw. Which of the following is the MOST likely cause of this issue?

  1. The motherboard M.2 slot is wired only for SATA-protocol drives and lacks PCIe protocol support.Answer
  2. B
    The drive must be added to a hardware RAID array in the BIOS setup before the OS can detect the hardware interface.
  3. C
    The NVMe drive requires high-level formatting via command-line utilities before the system motherboard can detect it.
  4. D
    The system power supply unit lacks adequate wattage capacity to power the PCIe bus lane controller.

Answer

The motherboard M.2 slot is wired only for SATA-protocol drives and lacks PCIe protocol support.
Although M.2 drives use a standardized form factor, the underlying connection protocol can be either SATA or PCIe (NVMe). Many motherboard M.2 slots are keyed for specific protocols or share bandwidth with SATA ports. If an NVMe drive is placed into an M.2 slot wired solely for SATA, the system host bus adapter cannot detect the drive.

Step-by-Step Solution

1
Analyze the reported hardware symptom.
The M.2 PCIe NVMe SSD is physically compatible with the slot keying and properly seated, but unrecognized by the OS and system firmware.
M.2 physical connectors share form factors across different bus protocols (SATA vs. PCIe/NVMe).
2
Compare protocol standards supported by M.2 slots.
Some legacy or budget motherboards feature M.2 slots routed exclusively to the SATA controller rather than PCIe lanes.
If an NVMe (PCIe) drive is installed in a SATA-only M.2 slot, the host controller cannot communicate with the drive.
3
Identify the correct troubleshooting conclusion.
Confirming motherboard slot specification for PCIe NVMe support is the primary diagnostic requirement.
Protocol mismatch explains complete non-detection despite proper physical installation.

Key Concept

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

Storage Drives and RAID Array Issues

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