According to one embodiment, a disk storage apparatus includes a disk having a storage area, a storage device storing management information, and a controller. The storage area includes a plurality of areas. The management information includes information indicative of a use priority or rank of each of the areas. The information indicative of the use priority or rank is set based on a quality index relating to a read operation or a write operation. The controller selects an area which is high in the use priority or rank and is usable, by referring to the management information, and executes the write operation on the selected area.