New For Lenovo ThinkPad T420 T420i T430 T430i T510 T510i T520 T520i T530 T530i Replace 12.7mm 2nd HDD SSD Hard Drive Caddy Tray - AliExpress
Amazon.com: Bfenown 2nd HDD SSD Hard Drive Caddy Tray Replacement for Lenovo Thinkpad T420 T430 T510 T520 T530 W510 W520 W530, Internal Laptop CD DVD ROM Optical Modular Bay to 2.5 Inch
Notebooks - What's this slot on T420 | bit-tech.net Forums
Can I use any of these on my Lenovo Thinkpad T420? : r/thinkpad
1TB SSD upgrade for T420. : r/thinkpad
ELECTROPRIME 1X(2nd HDD SSD Hard Drive Caddy Tray Replacement for Lenovo Thinkpad T420 T S8N7 : Amazon.in: Toys & Games
MSata SSD in Lenovo T420 with 12gb Ram and two more hard drives - YouTube