It is an object of the present invention to provide a radio signal demodulating device in which fluctuation follow ability of transmission channel environment is improved. The present invention provides a thrust bearing in the form of a roller thrust bearing including at least two radially arranged rows of rollers and a cage holding the rollers, the rollers including at least one roller crowned. The material layer is etched using the mask, and a planarizing layer is formed over the substrate surface. The command unit maintain at least one counter that is associated with current requests and compares the at least one counter to at least one predefined threshold in order to throttle the management unit when the at least one counter exceeds the at least one threshold. The disk drive interface is coupled to the baseband processing module and to an off-IC disk drive, wherein the disk driver interface facilitates transfers between the baseband processing module and the off-IC disk drive.