The Asus R750JK Laptop Supports Single and Dual Drive Configurations. (Two 2.5" Solid State Drives or Hard Drives) Note: If the second 2.5" Drive was not installed from Asus, you will need the 2.5" Drive caddy p/n 13NB0201AM1301 and second HDD cable p/n 08201-00322100 for installation.