Dell Latitude E6400 160GB 2.5" SATA Hard Drive with Caddy, Windows Vista Business and Drivers Preinstalled Operating System: Windows Vista Business 32-Bit Most Common Drivers Installed, Alternative Drivers Saved on HD It is the buyer's responsibility to have a Product Key for the installed operating system. Comes with instructions on how to install hard drive and put in your product key. For use with Dell Latitude E6400 only. SATA Operation Mode - IRRT