At least one example embodiment discloses a method of managing a power between a host serial advanced technology attachment (SATA) interface and a device SATA interface. The method includes first requesting to enter one of power saving states, defined by a SATA protocol, and second requesting to enter a deep power saving state if one of the host SATA interface and the device SATA interface operates at the first requested power saving state. The first requesting to enter one of power saving states and the second requesting to enter a deep power saving state are performed by one of the host SATA interface and the device SATA interface.