A computer-implemented method is provided for searching and analyzing a seismic data volume acquired in a seismic survey to determine potential for hydrocarbon accumulations in an associated subsurface region. The driving switching unit cuts off the transmission of the driving force to the transport member when the access cover is opened. A pair of electrode rods are disposed within the glass casing such that their tips face each other with a gap therebetween and project into the discharge space, and their base ends are embedded in the sealing parts and overlap surfaces of metal foils provided in the sealing parts. After backing up all of the data segments from a single client, the server commits the transaction which includes flushing newly written data from any open files, closing the open files, and updating metadata for the newly written data. The package structure advantageously features reduced size, relatively low costs, diverse bump locations, and an enhanced EMI shielding effect.