U.2

U.2 (pronounced 'u-dot-2'), formerly known as 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.

Not to be confused with U2. For other uses, see U2 (disambiguation).

It was developed for the enterprise market and designed to be used with new PCI Express drives along with SAS and SATA drives. It uses up to four PCI Express lanes and two SATA lanes.

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