The present invention relates to a recording apparatus, record carrier and method of recording data on at least two layers of a recording medium by using a radiation power, wherein individual recording speeds are determined for respective ones of the at least two layers at different values of the radiation power. The converter includes a single inductor with a pair of switching devices connected to its terminals in a symmetrical arrangement with respect to the inductor. The support plate has at least one locking part for connecting said microphone holder instrument thereto such that the microphone is oriented to a predetermined direction. The database may be maintained by many systems operating in parallel for high scalability. The assembly also includes a second glass guide operably connected to the inboard surface of the glass piece proximate the rear edge and retaining structures, each having a channel configured to slideably retain the glass guides.