2nd SATA HDD SSD Caddy Adapter for Lenovo ThinkPad T420 T430 T520 W520 W510 T510 | eBay
MSata SSD in Lenovo T420 with 12gb Ram and two more hard drives - YouTube
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 :
Adding an mSATA SSD to a Thinkpad T420
ThinkPad T420 Hard Drive Replacement - iFixit Repair Guide
2nd D SSD Hard Drive Caddy Tray Replacement for Lenovo Thinkpad T420 T430 T A1B3 192948887185 | eBay
Finally added mSATA SSD to my T420 and now have 3 drives booting multiple operating systems, what a joy 😁 : r/thinkpad
Sata To Sata 12.7mm 2nd Hard Drive Ssd Adapter Optibay For Ibm Thinkpad T420 T520 W520 W510 T510 Dvd Cd-rom Optical Bay - Hdd & Ssd Enclosure - AliExpress