A system and method for multiple power over Ethernet power supply management. Initially, differences between adjacent sensing values of a calibration plate are respectively determined and then stored in a memory. In the grooves are fitted the ends of another plate. A flexible printed circuit connects the spindle motor and main printed circuits boards. 045 psnm2km at a wavelength of about 1550 nm, and a cabled cutoff wavelength of less than about 1260 nm.