An ellipsoidal axes setting unit sets major and minor axis of an ellipsoid based on cross sectional position information and ellipsoidal parameters input by a user while viewing a display. A program is provided in the BIOS so that POST is not performed after the power is turned on. The metal is selected from alloys of Ni, Co, Cu, Fe and Al, preferably Ni alloys, and the solid lubricant is at least one of hexagonal boron nitride, graphite, calcium fluoride, lithium fluoride and molybdenum disulphide, preferably hexagonal boron nitride or hexagonal boron nitride and graphite.