TUTORIAL: Lenovo T440P M.2 SATA SSD Upgrade - YouTube
Refurbed this T420 for a local DJ, 16GB+512GB SSD and a fresh copy of Windows 11. Good to go for another 10 years! : r/thinkpad
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 T420 Upgrade Project | by HoshinoArika | Medium