A data storage disk includes a writeable area that allows a user to write data, wherein the data files are written from the outside diameter towards the inside diameter of the writeable area, while file system information is written from the inside diameter towards the outside diameter of the writeable area. Eyeglasses with securement bows which are somewhat transmissive to ultraviolet light are taught which allow outdoor exposure without the sharp untanned lines normally seen on the side of the wearer’s head. On the other hand, the opening portion penetrates the photo-resist in a case where the exposure amount is a second exposure amount larger than the first exposure amount.