In a method for testing a negative electrode of a secondary battery, light is irradiate to an active material layer formed on a current collector having a plurality of projections at least on one side thereof, the active material layer including first columnar bodies of active material grown obliquely from the projections. The invention furthermore relates to a method for operating a hydraulic drive device. According to further alternative preferred embodiments, the hollow pliant shell is translucent, portions of the hollow pliant shell are made opaque and the hollow pliant shell is colored. In another embodiment an optical reader can be provided in a specialized form factor including an enlarged head portion and an elongated body portion extending from the head portion. The processor uses the physical ID to determine the track type of a sector at which a recording operation initiates. The fluid adjusting device includes three parts retractably connected to each other and holes are defined through each of the three parts.