Lenovo Thinkpad T420 RAM SSD Hard Drive Optical CD DVD Drive Upgrade Repair Keyboard Replacement - YouTube
Lenovo ThinkPad T420/T420i - iFixit
SSD Upgrade for Lenovo ThinkPad T420s 256GB/512GB/1TB/2TB | eBay
Lenovo ThinkPad T420 14.0" Black USED Laptop - Intel Core i5 2540M 2nd Gen 2.6 GHz 8GB SODIMM DDR3 SATA 2.5" 256GB SSD DVD-RW Windows 10 Pro 64-Bit - Walmart.com
Lenovo ThinkPad T420s Hard Disk Drive Replacement - iFixit Repair Guide
Amazon.com: 240GB 2.5" SSD Solid State Drive for Lenovo/IBM Thinkpad T520-4241 T520-4242 T520-4243 T420-4177 T420-4178 T420-4180 T420-4236 T410-2516 : Electronics
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