Ultrabay III 3 2nd Hdd Caddy For Lenovo ThinkPad T420 T520 W520 T420i SATA 3.0 | eBay
How to install an additional drive in a ThinkPad ultrabay - Hemrin
HDD Caddy 9.5mm Original SATA Optical UltraBay 2nd Hard Drive Caddy with SSD or HDD for 9.5mm Universal CD/DVD Slot I - Buy HDD Caddy 9.5mm Original SATA Optical UltraBay 2nd Hard
Amazon.com: New 2nd HDD SSD Hard Drive Caddy for Lenovo Thinkpad T420 T430 T510 T510I T520 T520I T530 T530I T530U W510 W520 W530 W700 W701 R400 R500 12.7mm high with Matched Faceplate/Bezel :
43N3429 IBM Storage Accessory
i void warranties: ThinkPad Ultrabay Hard Drive Adapters