U.2, a.k.a. SFF-8639[1], in fact, is the successor of SAS.(It also allows legacy SAS and SATA usage.) So, it has a stronger enterprise inheritance. And so, the

U.2, a.k.a. SFF-8639[1], in fact, is the successor of SAS.(It also allows legacy SAS and SATA usage.) So, it has a stronger enterprise inheritance. And so, the enterprise clients can even use the same disk cases/cages without any problem when updating. Compared to M.2 form, U.2 has two benefits: 1. support hot-swapping(SAS-age enterprise character) 2. better thermal performance/heat dissipation(for larger shape) for data centers, the future will be the EDSFF family[2](goodness of U.2+goodness of M.2). M.2 can still stay for the consumer market. [1] https://en.wikipedia.org/wiki/U.2 https://en.wikipedia.org/wiki/U.2 [2] https://www.anandtech.com/show/13218/ssd-form-factors-proliferate-at-flash-memory-summit-2018 https://www.anandtech.com/show/13218/ssd-form-factors-prolif...