A data storage device with high efficiency, using a transport protocol core and a trigger machine. The transport protocol core is provided for the data storage device to communicate with a host. According to firmware of the data storage device, an operational schedule for the transport protocol core is pre-stored in the trigger machine. Instead of being triggered according to the firmware of the data storage device, the transport protocol core is triggered by the trigger machine to operate according to the operational schedule pre-stored in the trigger machine.