A system and method for treating the surface of a media, such as a magnetic hard disk, while in operation, such as during dynamic electrical testing is disclosed. By forming the holding member holding disks using three pieces, there is less deformation causes by high temperatures compared to integrally formed units. A fully continuous adaptive equalizer is used in conjunction with a Decision Feedback Equalizer to fully equalize a wide range of communications channels. Transducers associated with the provided degrees of freedom include sensors and actuators and provide an electromechanical interface between the object and a computer. Staffing requirements are unique for each customer and are based on the number of pounds needed to be worked during each month and the associated complexity for that customer’s typical or expected returns. The driving device can include a control module for controlling output voltage of the driving device; a light modulation module for adjusting overall current of the backlight; and a current regulating module for obtaining signals for adjusting individual current of each LED unit and adjusting the individual current of each LED unit according to the signals.