Abstract: A semiconductor device is inhibited from being degraded in reliability. The semiconductor device has a tab including a top surface, a bottom surface, and a plurality of side surfaces. Each of the side surfaces of the tab has a first portion continued to the bottom surface of the tab, a second portion located outwardly of the first portion and continued to the top surface of the tab, and a third portion located outwardly of the second portion and continued to the top surface of the tab to face the same direction as each of the first and second portions. In planar view, the outer edge of the semiconductor chip is located between the third portion and the second portion of the tab, and the outer edge of an adhesive material fixing the semiconductor chip to the tab is located between the semiconductor chip and the second portion.

Abstract: Before data is recorded in an optical disc, an optimum recording power is calculated in an inner peripheral part and in an outer peripheral part of the optical disc based on OPC learning. Before the data is recorded in the optical disc, the optimum recording power is calculated in at least an intermediate part between the inner peripheral part and the outer peripheral part of the optical disc based on the OPC learning. Then, a correlation between position shift amounts in the inner peripheral part, the outer peripheral part and the intermediate part along a radial direction of the optical disc and the optimum recording powers calculated in the respective parts is calculated. The optimum recording power in a current recording part is set based on the correlation when the data is recorded, and laser drive control is executed with the set optimum recording power so that the data is recorded in the optical disc.