A method of writing product servo sectors to a disk of a disk drive is disclosed. Spin-lattice as well as spin-spin relaxation time data and spectra are used to determine porosity and pore size distribution in human bones, including compact bones. The operator services switch, which is inter-operably coupled to the front end automation system, receives a call from the front end automation system, after the front end automation system has recognized the request and has determined the response to the request, and creates billing information relative to the call. Each mirror is operatively controlled to move into a laser beam path to direct individual laser output pulses the associated laser plug for providing spark generation. Thus, the clock for the initialization operation of the power domain is supplied after detecting that the voltage supplied to the power domain is stabilized. 49, a transparent adhesive layer provided on one surface of the transparent film, the transparent adhesive means having a refractive index of not lower than 1.