Finally added mSATA SSD to my T420 and now have 3 drives booting multiple operating systems, what a joy 😁 : r/thinkpad
Dell T420 can install SATA SSD ? : r/homelab
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
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