A method includes transmitting a command signal including a time-out time from a host to a storage device; determining, by the storage device, a first time amount, which is an amount of time required for the storage device to perform an operation corresponding to the command signal; when the first time amount is not greater than the time-out time, providing a first response signal including a success flag from the storage device to the host after the storage device performs the operation within the time-out time; when the first time amount is longer than the time-out time, providing a second response signal including the first time amount and a time-out reset flag from the storage device to the host; and when the host receives the second response signal, retransmitting the command signal to the storage device after the host resets the time-out time to the first time amount.
