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U.2 (pronounced 'u-dot-2' [1]), using the port SFF-8639, is a computer interface standard for connecting solid-state drives (SSDs) to a computer. It covers the physical connector, electrical characteristics, and communication protocols.
如果说非要有关系，可能在于部分m.2高端固态硬盘与u.2固态硬盘一样支持nvme协议，市面上也有u.2接口转m.2接口转接卡。 U.2接口同时具有SAS和SATA两种接口的特点，其中间被针脚填满，与SATA一样具有防呆口，同时可兼容SATASATA ESAS接口规范。
Compared to a typical M.2 SSD, U.2 is significantly faster. While U.2 read speeds are 2500 MB/s and M.2 NVMe read speeds are 3500 MB/s, M.2 SATA read rates hover around 600 MB/s.
U.2 is a hardware interface for connecting drives, particularly nonvolatile memory express (NVMe) SSDs, to a computing device over the PCIe bus. SSDs can be attached to host systems via one of three interfaces: SATA, SAS and NVMe.
Intel DC P4610 1.6TB PCIe 3.1 x4 NVMe U.2 2.5" Enterprise SSD (SSDPE2KE016T801) 4KB Random Read: Up to 620,000 IOPS; 4KB Random Write: Up to 200,000 IOPS; Max Sequential Read: Up to 3200 MBps; Endurance: 4.2 DWPD; Model #: SSDPE2KE016T801 $
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M.2 vs NVMe vs. 2.5" vs. U.2 SSDs. The primary types of SSDs are the 2.5”, M.2 (SATA & NVMe), NVMe PCIe SSD, and the U.2 (formerly SFF-8639), each offering distinct advantages and disadvantages.
Western Digital 3.84TB WD Gold SN600 Enterprise Class NVMe Internal SSD - U.2 PCIe, 2.5"/7mm - WDS384T1D0D
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What is a U.2 SSD? Today’s SSDs are built to use the PCIe-based NVMe standard for communication, which was designed specifically for SSDs, instead of the older SATA standard designed initially for hard disk drives (also known as HDDs).