A radio transceiver includes a charge pump formed within a local oscillator that adjusts a voltage input to a voltage-controlled oscillator in a manner that flattens a response curve for small changes in voltage due to a variety of effects including channel length modulation. A read request for first data is received at a data storage system. The second packet processing circuit executes discarding data packets from among the data packets, counting discard number of the data packets and collecting the discard number counted by the second packet processing circuit and the discard number indicated by the discard number information included in the discard number information packet. Varying the switch means programmes the fluid output mode of each 32 control valve pair to provide any one of a number of different effective valve types. An actuator axially moves the brake plate relative to the discs between an engaged position where braking surface is in engagement with a facing radial surface and a disengaged position where said braking surface is spaced from said facing radial surface. The disconnection sub is operable to receive wirelessly a pre-designated command signal, to selectively couple the uphole section and the downhole section together, and to selectively uncouple the uphole section and the downhole section from one another.