Determining motor voltage

[THATguy]

I have two motors from a CD-ROM drive. One has 4 wires, the other 11 wires.
Are these motors DC?
I can put the drive back together to test if necessary, though I'll need some advice on which wires to test.

I wish to make X & Y drive rails for a mini CNC drill. So the first smaller motor can already do this job.
The second motor I wish to use to get different rotation degrees. It does not need to be fast, I could easily replace this 11 wire motor with a simple DC fan motor if you think that would be less hassle?

These motors do not appear to show any voltage ratings on them.

[Richard Crowley]

The motors that move the head in an optical (or floppy) drive are typically small stepper motors.  There are hundreds of references how to drive small stepper motors by applying a voltage (typically 5V) to different windings in sequence.

The spindle motors of floppy, optical, and hard drives are typically multi-pole "DC-brushless" motors. Again, they are actuated by applying power sequentially to the various windings.  There are special chips designed specifically to drive those kinds of multi-pole motors.  They typically don't work very well at low speeds. They are optimized for smooth operation at a few hundred RPM.

[Zero999]

The first one looks like a stepper motor and the second, a brushless motor, as mentioned above. They both need different, driver circuitry and won't work directly of a DC supply.