floppy disk drives, hard disks, CD/DVD drives too.
Hard drives do not contain steppers as far as I know. Floppy disk drives. CD/DVD drives don't normally do they, the one for the drive is a normal motor with sensors for open/closed. The one for the laser has sensors each end and a screw drive which is accurate enough to just use a controlled normal one (or is it a tiny stepper). I think it is the same in floppy drives.
I thought it was in printers, I suppose it has to be, like in scanners. I have an old printer that is in bits sitting in a box but I have not taken the motor out of the casing yet.
Mowcius