A switched reluctance machine having a rotor and stator pole numerical relationship of S number of stator poles and R number of rotor poles, where R=2S\u22122, when S is greater than 4; provides improved power density, torque production, torque ripple, and is readily adaptable to existing hardware such as known controllers and the like. A number of different payment protocols may be used for these TV commerce transactions, where the protocol messages are then augmented according to the present invention to include TV context data. Further, rotation driving control of the disk is selected according to factors other than the type of the disk, such as according to whether random recording is allowed or not, according to a recording state in the disk, according to whether an alternative area is provided or not, according to a recording start position, or according to whether initialization is required or not. The outlet for gas phase is inserted into the cavity through the upper surface of the cavity, wherein the depth of the insertion is around 0.