Abstract: A surface panel with a disk driver holder opening and corresponding cover plate, whereby the cover plate may be easily fitted to the holder opening of the surface panel by engagement of upper and lower hook elements and positioning elements at two lateral sides of the cover plate to corresponding upper and lower positioning elements and hook elements at two lateral sides of the holder opening, with the holder opening being sized for fitting of a disk driver so that the latter remains flush with the holder opening without forming a gap between the disk driver and holder opening after installation.

Abstract: A computer casing connecting structure includes a base, an upper cover and a surface panel, each with corresponding structures for assembly together and fixed by only a bolt. The surface panel is designed with a plurality of seats for socket, switches and power source switch which are fixed by structures of the surface panel itself without use of any fastener. The base includes stepped edges in to position its front and back plate firmly and eliminate the possibility of deformation caused by external force.