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Difficulty: MediumStorage Devices and Interfaces

A desktop technician is selecting storage hardware for a workstation upgrade. Match each storage interface, protocol, or form factor keying standard on the left to its corresponding operational or physical characteristic on the right.

  • U.2 (SFF-8639)Uses a 2.5-inch form factor connector wired to PCIe lanes to provide enterprise-grade NVMe drive connectivity.
  • M.2 B-KeyPhysical pin configuration socket layout restricting data throughput to a maximum of PCIe x2 speeds or SATA signals.
  • NVMeHost controller interface protocol designed specifically for high-speed solid-state drives using direct PCIe bus communication.
  • SATA Revision 3.0Storage interface standard capped at a maximum theoretical transfer rate of 6 Gbps using AHCI command queuing.

Answer

U.2 (SFF-8639) matches the 2.5-inch form factor connector wired to PCIe lanes for enterprise NVMe connectivity. M.2 B-Key matches the physical pin configuration layout restricting throughput to PCIe x2 or SATA signals. NVMe matches the host controller interface protocol designed specifically for solid-state storage over PCIe. SATA Revision 3.0 matches the interface standard capped at 6 Gbps using AHCI.
Each storage technology is matched to its definitive characteristic: U.2 provides enterprise 2.5-inch PCIe connectivity; M.2 B-Key specifies a pin arrangement allowing PCIe x2 or SATA; NVMe is a dedicated software protocol for flash storage over PCIe; SATA 3.0 is the 6 Gbps bus interface operating on legacy AHCI.

Step-by-Step Solution

1
Identify physical drive form factors and connection types.
U.2 corresponds to the SFF-8639 connector used in 2.5-inch drive enclosures for hot-swappable PCIe drives.
Recognizing physical form factors ensures proper drive mounting and backplane compatibility.
2
Differentiate M.2 socket keying options.
M.2 B-keying supports up to PCIe x2 or SATA interfaces, whereas M-keying supports up to PCIe x4.
Understanding keying standards prevents mechanical insertion mismatches and protocol speed limitations.
3
Separate software protocols from underlying physical hardware buses.
NVMe is the high-performance communications protocol built for flash memory, whereas SATA Revision 3.0 is a bus standard operating at 6 Gbps using AHCI.
Distinguishing between NVMe, AHCI, PCIe, and SATA ensures accurate performance troubleshooting and system configuration.

Key Concept

Storage Interface Standards, Form Factors, and Protocols
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Topics

Storage Devices and Interfaces

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