A recording apparatus which records information on a write once recording medium sequentially including a user data area, a first management information area, an indicator area and a second management information area on a recording layer thereof. When included in boot ROMs on mobile battery operated devices, this enables a much shorter interval between power-on and the device reaching operational state because it is no longer necessary to navigate through multiple layers of the directory tree and searching every entry in each branch for a matching filename. The pocket and pivot member arrangement allow the cover plate to be rotated relative to a cable trough to which the hinge pieces may be mounted. When the device is retracted, the slide part with the belt slides along a longitudinal groove made on at least one side of the body part until the slide part is interlocked. The feature with an increased width may be adjacent, and outside, the defined active region.