1. A calibration method for a controlling device of a storage device, the calibration method comprising: transmitting first data comprising a calibration data and a first checksum to the storage device according to each of a plurality of training parameter sets; recording a plurality of error indicators which are respectively corresponding to the plurality of training parameter sets and from the storage device; and identifying one of the plurality of training parameter sets as a predetermined parameter set according to the plurality of error indicators respectively corresponding to the plurality of training parameter sets; wherein each error indicator indicates whether transmitting the first data according to the corresponded training parameter set is successful.