Ahh - darn it - I missed that in the manual - thank you very much for noting it - much appreciated. I thought I had read SATA only, but couldn't find out where, and the PCIe/SATA label on the inside face of the little cover that you remove to fit the drive, and is what got me wondering. Thanks for that - SATA it is! Chocks away! I have a lot of reference material and design data (Parts catalogues, service manuals, CAD files and 3D data) are on my networked drive at home and are mirrored on a plug in hard drive, but if I fit a second SSD to this laptop, it makes things a little more convenient and faster (and I think I can automate it to keep both the shared drive and my internal drive mirrored) As a side note - I've bought this laptop to change back from Mac to PC - Apple stopped supporting my long loved 27" imac, so Fusion360 no longer runs on it! This was really frustrating, as the hardware spec of the imac is still pretty good. I did try Bootcamp, but I can only get it running Windows 8, and really need 10..... Apples response is to buy a new computer - so I did - a PC!
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