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Zorluk: OrtaMotherboards Form Factors and Connectors

A technician installs a new PCIe x4 M.2 solid-state drive into a motherboard's primary M.2 slot. Upon booting the system, the technician notices that the new M.2 SSD is functioning correctly, but two SATA hard drives previously connected to motherboard ports SATA5 and SATA6 are no longer detected by the BIOS/UEFI. The technician verifies that all power and data cables are securely attached. Which of the following best explains why the two SATA drives are no longer recognized?

  1. The motherboard shares bus bandwidth between the M.2 slot and specific SATA ports, automatically disabling those SATA ports when an M.2 drive is populated.Cevap
  2. B
    The M.2 SSD relies on an incompatible physical key module, causing the motherboard chipset to disable auxiliary SATA ports to prevent an electrical short.
  3. C
    The power supply unit has exceeded its maximum wattage capacity on the 12V rail, forcing the motherboard to shut off power to the SATA controller.
  4. D
    The motherboard BIOS/UEFI corrupted its hardware configuration during POST and requires a CMOS clear to re-enumerate the onboard SATA controller.

Cevap

The motherboard shares bus bandwidth between the M.2 slot and specific onboard SATA ports, automatically disabling those SATA ports when the M.2 slot is populated.
On many desktop motherboards, internal bandwidth limitations dictate that certain expansion interfaces share controller lanes. When an M.2 SSD is installed into a slot that shares bandwidth with onboard SATA ports, the motherboard automatically disables those specific SATA ports (in this case, SATA5 and SATA6). Moving the SATA drives to unaffected ports restores their connectivity.

Adım Adım Çözüm

1
Analyze the reported hardware symptom following the component installation.
The new M.2 SSD operates normally, but specific SATA ports (SATA5 and SATA6) suddenly stop detecting drives despite secure physical cabling.
Determining why functional hardware loses connection specifically after adding an M.2 device.
2
Evaluate motherboard system architecture regarding lane routing and bandwidth sharing.
On modern motherboards, high-speed M.2 slots share PCIe or SATA controller lanes with designated onboard SATA ports.
When an M.2 device is detected in a shared slot, motherboard multiplexers disable the corresponding SATA ports to allocate bandwidth to the M.2 drive.
3
Identify the correct resolution for the technician.
The technician should relocate the SATA data cables from ports SATA5 and SATA6 to unshared SATA ports (such as SATA1 through SATA4).
This resolves the detection issue without removing the M.2 drive.

Anahtar Kavram

Motherboard Lane Sharing and M.2/SATA Bandwidth Multiplexing
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Konular

Motherboards Form Factors and Connectors

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