AFUNTA Ultrabay SATA 2nd HD Hard Drive Caddy Tray Compatible Lenovo ThinkPad T420i T510 W510 T520 Ultrabay SATA 2nd HD Hard Drive Caddy Tray for Lenovo ThinkPad T420i T510 W510 T520 Supports Hot swapping, Plug & Play, Like a primary HDD, Fast & Reliable connection No cables/PSU/software driver needed Compatible for ThinkPad T420 T420i T510 W510 T520 W520 Installation : Remove CD-ROM drive and plug the Adapter (Plus hard drive) in slot.