Hi @ecv, P6679 is more of a model line then a specific notebook, when I google it I find different versions of it, some with both an SSD and a normal HDD. This would mean that there is room for at least 1 2,5" harddrive, and 1 SSD. I'd expect the SSD to be M.2 (I've not been able to find any conclusive info on this though), M.2 is not interchangeable with a regular 2,5" SATA harddrive, it is different in physical dimensions and had a different connector. I think you'll have to ask the reseller of the exact model you are looking at if the SSD in it is a M.2 or a 2,5" SSD. If it is M.2, you will be able to mount a 2,5" harddrive. If it is a 2,5" SSD, then a hdd tray to replace the optical drive might be an option.
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