Dell Latitude E6400 80GB 2.5" SATA Hard Drive with Caddy, Windows 7 Pro 32 and Drivers Preinstalled Operating System: Windows 7 Professional 32-Bit Most Common Drivers Installed, Alternative Drivers Saved on HD Buyer must have a Product Key for the installed operating system. For use with Dell Latitude E6400 only. SATA Operation Mode - IRRT