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Re: Alienware 17 R4....SSD One half-size M.2 PCIe/SATA driv

Interesting, the Service Manual doesn't explicitly mention that, but I can see on its diagrams that the slots are clearly shown.  As for compatibility, I doubt you'll get an official answer from Dell about it since they of course can't test every possible SSD in this system, and unless they sell the SSD you're looking at from the factory, they probably haven't tested the one you're asking about.  Still, the system specs you posted clearly indicate that the half-height slot supports both PCIe and SATA SSDs, and the unit you're looking at is the correct physical size for a half-height slot, so I don't see why it wouldn't work.

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