The present invention provides novel disulfone compounds and methods of preparing and using those compounds to further prepare biologically relevant gem-disulfone analogs of natural enzyme substrates. The power control signal for controlling a laser diode may be a read level, an erase level and a write level. A one-dimensional partial fast Fourier transform of each block in a row of blocks is computed. In another aspect of the invention, an implant includes a spacer and separate extensions engageable with the spacer.