A method for suppressing arc formation during an electrosurgical tissue treatment procedure includes the steps of supplying pulsed current from an energy source to tissue and measuring the pulsed current supplied from the energy source. The arch unit includes a first abutment and a second abutment, a deck extending between the first and second abutments, a pair of asymmetrical arches, and a plurality of suspender members 3 attached between the arches and the deck. After the disk drive power on operation completes, the window size control program requests restoring of TCPIP window size on NAS client using the window size information stored in the agent. As a result, writeread operations with respect to the disk are made efficient and the page inputoutput speed is increased.