A data storage device is provided. The data store device includes a first printed circuit board (PCB) comprising a main transmission line formed on at least one surface of the first PCB and/or within the first PCB, a memory controller and a plurality of nonvolatile memory devices. The memory controller is provided on the first PCB. The plurality of nonvolatile memory devices are provided on the first PCB. The plurality of nonvolatile memory devices are connected to the memory controller through a channel and exchange data with the memory controller. The channel includes a data transmission line connecting data pads of the memory controller and the nonvolatile memory devices. The data transmission line comprises the main transmission pattern and an open stub contacting the main transmission pattern. The open stub does not contact any other conductor other than the main transmission pattern.