Data storage devices are described with an ECC system that generate additional on-demand ECC information for a previously written track to provide for correction of data errors in the track and thereby avoid having to rewrite the track. The preliminary mounting surface is parallel to the structure mounting surface. The substrate of the present invention is characterized in steps 5 for positioning being formed on at least one side of the substrate 1 that provides the optical waveguide 4. \u201d Accordingly, a semiconductor device assembly may include a first, semiconductor device-carrying substrate and a second, interposer-comprising substrate. The cartridge may also include a second end, movable within the cartridge chamber, and a locking mechanism having a locked configuration and an unlocked configuration, the locking mechanism preventing movement of the second end within the cartridge chamber while in the locked configuration. Moreover, when an output device that is designated by a received output instruction is a locally owned apparatus, the apparatus performs the processing as instructed.