As SATA Express never took off because of the two-lane limitation, the SSD and motherboard industries have been looking for an alternative connector for connecting 2.5" SSDs over PCIe. SFF-8639, which is essentially SATA Express on steroids with support for four PCIe lanes, has been viewed as the most potent connector because it already has industry support in the enterprise space and with the SSD 750 Intel brought the SFF-8639 connector to the client side. Given that SFF-8639 isn't a very consumer facing name (even I've had trouble remembering the numbers), the SSD Form Factor Working Group has decided to rename the connector as U.2 to make it more marketable. That coincides well with M.2 that has already been used in the industry for...

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