Disk used for calibrating floating height of protrusion detection head, method of calibrating floating height of protrusion detection head using the disk and glide tester using the method

摘要

A bump disk including a standard protrusion having a predetermined height and a plurality of reference protrusions positioned either on substantially the same radial line as the standard protrusion or on a circumferential line having substantially the same radial distance as the standard protrusion under a predetermined positional relationship with respect to the standard protrusion, a method of calibrating the floating height of a protrusion detection head by making use of a standard circumferential speed determined with the bump disk and a glide tester using such calibration method.