The filter system for filtering particulate material from a generally unidirectional fluid stream comprising a first filter removably positioned in the fluid stream and a second filter removably positioned in the fluid stream downstream of the first filter. The method includes forming a donor wafer comprising a tensilely strained gettering layer disposed over a substrate, and at least one material layer disposed over the tensilely strained gettering layer. After the time interval, the heating power is reduced, and the spiral servo tracks are written to the disk. In this aspect, the invention allows one to move between adjacent tetrahedra, and any data corresponding to the tetrahedra, in constant time. A heat spreader is provided on the second surface of the base so that the heat spreader does not contact the semiconductor device directly.