1. KKU-Seagate Cooperation Research Laboratory, Department of Electrical Engineering; Khon Kaen University; Khon Kaen 40002 Thailand
2. Seagate Technology (Thailand) Co., Ltd.; 1627 Moo 7, Teparuk Rd., Tambol Teparuk Amphur Muang Samutprakarn 10270 Thailand
3. Faculty of Applied Science and Engineering; Khon Kaen University, Nong Khai Campus; Nong Khai 43000 Thailand