Hi @wKermit, As far as I have been able to find, there are different versions of the X7611, all are delivered with both an SSD (of various brands and sizes, with an Msata formfactor) and a normal 2,5"harddrive (also differend brands and sizes). I've not found any version with 3 harddrives, nor have I found any indication that it is possible to add a third harddrive. My assumtion is you can mount 1 SSD through the Msata connection, and one regular drive (or 2,5" SSD) through the regular sata connection. So unless you have the Msata version of the Evo 840, I'm afraid you wont be able to mount both the regular 500 gb hdd and the Evo 840.
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