BestDealUSA 12.7mm 2nd SATA Caddy For IBM Thinkpad T420 T520 W520 W510 T510 This Caddy adapter accept 2.5' 12.7MM SATA HDD only. This is the new type , special design, and high quanlity Caddy! Supports Hot swapping, Plug & Play, Like a primary HDD, Fast & Reliable connection No cables/PSU/software driver needed Installation : Remove CD-ROM drive and plug the Adapter (Plus hard drive) in slot. Compatible with: ThinkPad T420 T420i T510 W510 T520 W520