I took apart a cd rom writeter, an old lite-on, that no longer works. The whole laser assembly is on to metal shafts, with a 3rd shaft that sortalooks like a screw, when i spin the screw shaft the whole laser assembly moves either up or down the other two metal shafts. the screw shaft is attached to a small circular motor, about the size of a penny, and half an inch deep. It has 4 leads. Is this a stepper motor? How would i get more information to make it usable. Ive never used a motor before, so any help would be great. I would be using a atmel 89c2051 to interface with it.