Provided is an electric power steering device in which the operation feeling is improved without a decrease in commercial value. During rendering of an object, an environment texture sample is retrieved from the environment map based on a reflection vector stored in a pixel of the reflection image. The prepit information is recorded on the guiding track at a position where interference of adjacent guiding tracks with the prepit information is prevented. An aperture can be positioned in the body portion and extend through the protrusion. Cartridges with a higher priority may also be stored closer to a storage drive than cartridges with a lower priority.