Plug and Play<br />for 12.7mm Universal CD / DVD-ROM Optical Bay<br />Compatible for: <br />for IBM for ThinkPad T420 T420i<br />for IBM for ThinkPad T510 T510i T520 T520i<br />for IBM for ThinkPad W510 W520<br />for IBM for ThinkPad R400 R500<br />for IBM for ThinkPad W700 W700ds W701 W701ds<br /><br />Simply remove your CD-ROM drive and put the Caddy (with the added hard drive) in it's place.