SSD interfaces are various, the mainstream SATA3.0 interface is the most common, and the most recent M.2/PCI-e interface is very popular. The SSD of Ultrabook has been used to the mSATA interface, and now a U.2 interface has emerged. To step on M.2, replace SATA, become the mainstream choice for future SSD? What exactly is the U.2 interface?
What is the U.2 interface?
U.2 SSD interface specification
The U.2 interface, originally called SFF-8639, was pushed by Intel. Essentially SATA Express, and the SATA-E physical interface is retrofitted with a SATA 6Gbps interface, somewhat similar to the SAS interface. It uses two SATA 6Gbps interfaces and a mini SATA interface with only 4pin pins. The small interface can only be connected to the PCI-E cable. The biggest advantage of this is that it is backward compatible, because the current number of SATA E hard drives It is too little and too little.
The design of the U.2 interface is similar to that of SATA-E. It utilizes the existing physical interface as much as possible, but the bandwidth is faster, from PCI-E x2 to PCI-E 3.0 x4, and many new protocol support has been added. For example, NVMe, these are not available on the SATA E interface. It can be said that U.2 is actually the complete body of SATA E.
Why is U.2?
U.2 interface motherboard interface
The earliest time of M.2 was called NGFF. U.2 was also called SFF-8639 at the earliest. SFF-8639, because the name is too unfamiliar, obviously not easy to be remembered by the user, this temporary name soon has a formal name: U.2.
What are the characteristics of the U.2 interface?
On the latest 100 series motherboards, equipped with the latest U.2 interface
U.2's device-side interface combines the features of SATA and SAS interfaces. The middle uses pins to fill the vacancy left by the SATA interface, and the L-type foolproof design is reserved, so it can be compatible with SATA, SAS and SATA E specifications. One end is the mini SAS (SFF-8643) interface, and the U.2 line on the device side is connected to the SATA power supply at one end and to the data port of the U.2 hard disk at one end.
The biggest feature of U.2 interface is support for NVMe standard protocol, high speed, low latency and low power consumption. The bandwidth is PCI-E 3.0 x4. The theoretical transmission speed is up to 32Gbps, while SATA is only 6Gbps, which is 5 times faster than SATA.
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