Fortysomething Geek: Thinkpad T420 triple drives with MSATA and Ultrabay
ThinkPad T420 Hard Drive Replacement - iFixit Repair Guide
2nd Hdd Ssd Hard Drive Tray Replacement For T420 T430 T510 T520 T530 W510 W520 W530, Internal Laptop Cd/dvd-rom Optical Modular Bay Adapter To 2.5 In | Fruugo NO
2011 14″ Lenovo Thinkpad T420 (Q NVS4200M) [2nd,2C,M] + RX 460 @ 4Gbps-EC2 (EXP GDC 8.x) + Win10 // DIY HDMI input port: internal & external all in one LCD with button
NEW 2nd SATA SSD Hard Drive HDD Caddy for LENOVO Thinkpad T420 T430 T510 T520 T530 W510 W520 W530 W700 W701 R400 R500 - AliExpress
ThinkPad T420 Hard Drive Replacement - iFixit Repair Guide