My Samsung RF711 has two HDD bays (currently have 2 x 256 gig SSDs installed) Plus it has a Blu-ray Rom/DVDRW drive. Before Buying I also noted Asus 17 in model with twin drive space. The one They got me at work (enterpise md) came with a 2nd HDD to replace the DVD drive and a portable DVD drive. Told them I wanted two HDDs.
Have a Older 15.6" Tosibiha that has TWO HDD bays, they JUST didn't stick the MB connector on. Ticked my off, Have thought about getting a socket soldered on, but don't know if the Bios would recognize the 2nd HDD. It also Has a DVD drive, So there is the Posibility of finding a 15.5" Lappy with twin Bays + DVD drive - but probably rare as Hen teeth.