A magnetic write head having write pole and a wrap-around-trailing magnetic shield having side portions that are separated from the write pole by tapered non-magnetic side gap layers. A lower positive power supply potential is not used to turn OFF PFET coupled to a higher positive power supply potential. The support shaft provides a locating axis about which the support shaft may rotate when mounted to the carriage body. The payload interface board, the at least one daughter board, and the battery board are coupled to the main system board through one or more stackable connectors. A voltage UPos, which corresponds to the present position of the elevator car, is supplied to a position-sensing unit by a measuring line.