There are three common drive modes used with Stepper Motors. The Wave Drive (or One-Phase On) Mode only allows one winding (or one phase) to be energized at any given time. The advantage is its simplicity, but it presents a disadvantage in that with the unipolar wound motor, it uses only 25% of the total motor winding at any given time, and with the bipolar wound motor, it uses only 50% of the total motor winding at any given time. The Full Step Drive (or Two-Phase On) Mode allows two windings (or two phases) to be energized at any given time. With a unipolar wound motor, this mode uses 50% of the available windings and with a bipolar wound motor, it uses the entire windings. The Half Step Drive (or 1 and 2 Phases On) Mode allows both wave drives and full step drives (1 and 2 phases on) modes. This results in angular movements that are half of those in 1-phase or 2-phase On drive modes. Half step drive mode can reduce a phenomena referred to as resonance which can be experienced in 1-phase or 2-phase On drive modes.