Got a used HP Probook laptop. Just needs a new drive. HP specs say it has an m.2 2280 slot. So that’s what I ordered. Guess I needed to look closer.
edit: Thanks for all the info, guys. Different types of keys are explained here. Gonna have to look for a sketchy no-name brand.
There were only really a few years where m.2 sata was relevant.
Nowadays the only time I buy an m.2 sata drive is to put into some sort of adapter.