Extremely slow SSD in Surface Book

@Seug Joonyi> You are talking about SATA SSDs. The SSD that comes with Surface Book and Surface 4 Pro is an M.2 Nvme interface. For the same model, Microsoft sources it from Samsung and Toshiba. Out of the box the Toshiba is 3X faster. The Samsung 950 pro 512 is the Samsung model in Surface Book. This ssd is supposed to have 1500 Mbps/s sequential write and 2500 Mbps Sequential read. Even in a worst case scenario it should not drop below 950 Mbps write.

http://www.anandtech.com/show/9702/samsung-950-pro-ssd-review-256gb-512gb

Thank you very much for that information.  I have the Surface Book i7/16GB/512GB so I would have the "faster" drive.  For what I'm doing with my file sizes, the writing speed differences in the drives would be measured in just fractions of seconds and for all practical purposes would be negligible.

I certainly don't like that Microsoft gave me the slower drive, but I doubt that, for what I do, I would ever be able to tell the difference.

Well, I don't see things so grave.  I'll still buy Surface for my next one.  A Samsung SSD doesn't destroy anything.

Sure. Really, nobody but very discerning buyers & storage-heavy users need to be concerned with this thread.

I mean, I don't think most people care that Microsoft never patched the hardware defect in the old-gen Samsung TLC SSDs in the Surface Pro 3 (though Dell and other OEMs did), nor that Microsoft quietly sent faster and theoretically longer-lasting MLC SSDs to only reviewers, nor that they consider TLC worthy of 2015's "Ultimate Laptop". 

I mean, it's as if Microsoft put USB 2.0 instead of USB 3.0 on the Surface Book. It would affect almost nobody.

Well, I don't see things so grave.  I'll still buy Surface for my next one.  A Samsung SSD doesn't destroy anything.