Am i missing anything?

i have few motors like 1 which i rescued from old cassette player,
2 small motor from my crappy Optical Drive. Wait!

1 of them is very small and has 4 pins (is it a stepper?)
and 2nd is simple motor with 2 pins

i can use them, but what are the voltage rating for that motors as i didn't find any rating printed on them.

I'll post few pictures of them for more clarity and recognition.