A sintered ferrite magnet having an M-type ferrite structure and comprising Ca, an R element which is at least one rare earth element indispensably including La, Ba, Fe and Co as indispensable elements, which is represented by Ca1-x-yRxBayFe2n-zCoz, wherein, x, y, z and n are numbers representing the amounts of Ca, the R element, Ba and Co and a molar ratio, meeting 0. The executing system uses a rule base service interface for receiving a service request content which includes a header from a rule base service module, and obtains a proper rule from the rule base according to the header when a rule component receives the service request content. The controller applies a phase shift to the third pattern of pulses based on the desired fundamental voltage phase. The issuance of the interrupt indicates that the optical storage device is ready to receive a data transfer command.