A method, system, computer system, and computer program product to allocate storage resources among multiple logical volumes. A multi-bit linear shift register receives data and clocks the data fifteen times. An electronic controller receives a pressure control signal and controls the servovalve responsive to any difference between the pressure control signal and the actual measured pressure signal. Along the sides of base 100 are located a plurality of USB input and output ports, some of which may be powered. A summer sums the binary weighted outputs, and a quantizer generates an output digital code corresponding to data stored in a plurality of memory cells during a prior program cycle.