A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The power system comprises a front stage, a hot-swap stage and a load stage; wherein the hot-swap stage comprises: a buck converter having a switch operate at ONOFF state to provide a desired output voltage to the load stage with low power loss and optimized thermal design. A coil center axis of the coil spring and a kingpin axis are set to be in a twisted relationship. For example, assume that the predefined set consists of one S&P 500 futures, one NASDAQ futures, one S&P Midcap 400 futures and one Russell 1000 futures and the threshold is three. The digital scale may determine the medicament dosage by performing a local query to a locally-stored medicament database which may be stored locally within the digital scale, andor by performing a remote query to a remotely-stored medicament database which may be stored externally to the digital scale.