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Zorluk: ZorStorage Devices and Interfaces

An IT technician installs a PCI Express (PCIe) expansion add-in card to add two M.2 slots (labeled Slot 1 and Slot 2) to a workstation system. According to the expansion card documentation, Slot 1 routes directly to the motherboard PCIe lanes, while Slot 2 relies on an onboard SATA controller pass-through port that requires an external SATA cable connected to the motherboard. The technician installs two identical M.2 PCIe NVMe solid-state drives into Slot 1 and Slot 2. Upon booting the operating system, only the drive in Slot 1 is recognized. Which of the following best explains why the drive in Slot 2 is not detected?

  1. Slot 2 only carries a SATA host interface signal, making it incompatible with PCIe NVMe protocol drives.Cevap
  2. B
    The system motherboard lacks PCIe slot bifurcation support required to split lanes across multiple drives on a single card.
  3. C
    The storage controller in the UEFI setup must be changed from AHCI mode to NVMe host controller mode.
  4. D
    SATA Express backward compatibility automatically disables the secondary drive slot whenever Slot 1 operates at PCIe 4.0 speeds.

Cevap

Slot 2 only carries a SATA host interface signal, making it incompatible with PCIe NVMe protocol drives.
The correct option correctly identifies that Slot 2 is wired through a SATA host controller interface. PCIe NVMe drives require direct PCIe bus lane signaling. Because Slot 2 only provides SATA protocol signaling, the PCIe NVMe drive cannot be detected by the system.

Adım Adım Çözüm

1
Analyze the hardware interface wiring described in the scenario
Slot 1 routes via PCIe bus lanes, while Slot 2 routes exclusively through a SATA controller pass-through.
M.2 form factor slots can be wired to transport different underlying bus protocols (PCIe or SATA).
2
Evaluate the drive protocol compatibility against the host interface
An M.2 NVMe SSD requires PCIe signaling lanes and cannot function over a SATA protocol interface.
NVMe drives do not possess backward compatibility for legacy SATA host signals.
3
Identify the primary root cause for non-detection in Slot 2
The NVMe drive installed in Slot 2 cannot initiate communication because the slot provides only SATA bus signaling.
Installing an NVMe drive into a SATA-only M.2 interface leads to a complete failure to recognize the drive.

Anahtar Kavram

M.2 Form Factor Bus Protocols and Interface Compatibility
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Konular

Storage Devices and Interfaces

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