I got the N56VZ a while back and I found it using the same method. If you don't use the blu-ray drive (and who does, really?) it's pretty trivial to swap it out with a new drive caddy. I put the HDD in there because I heard people had trouble booting from the caddy and put in a SSD where the HDD was. This [1] is the caddy I used, and swapping out the face plate with the original is pretty easy. Considering the price of the machine in the first place, why not throw a second drive in there.

[1] http://www.ebay.com/itm/Second-Hard-Drive-2nd-HDD-SSD-Caddy-...