An improvement is achieved in the mounting reliability of a semiconductor device. The artificial fiber includes at least two fiber flange portions, at least one fiber flange portion forming the stiffness-enhancing portion, while at least two fiber flange portions have a uniform thickness. The first card has a sample collection area. Since cluster boundaries and erasable block boundaries in the user area are aligned, there is no need to perform wasteful processing in which two erasable blocks are erased to rewrite one cluster. Minimum beam spot size and Rayleigh length are chosen to keep the energy density per pulse in the above-mentioned range of the energy density. A bearing retaining nut arrangement that permits the loading or evaluating of a bearing inner race is also provided.