Starter sometimes screeches when turning the key.

I'm not sure I understand the "bad starter drive". Would that be corrected if I replace the starter? I've done that on other cars, so I know it's not that difficult. Thanks in advance.

Starter drive or some call bendix is in starter. Unless you have local starter rebuild shop usually makes more sense to just replace starter. When starter removed look carefully at teeth on starter drive- if you see worn or broken teeth- that's your problem. If not- inspect teeth on flywheel.