Abstract: A panel structure includes a large door and a small door. The large door and the small door can be opened and closed. The opening direction of the small door is different from that of the large door. The small door is set in a place which has a plurality of installed openings for installing any type of CD-ROM drive or hard disk. Hence, a user can assemble, disassemble, or replace a CD-ROM drive or a hard disk by simply opening the small door and without opening the large door. Therefore, it is convenient for the user to assemble, disassemble, or replace a CD-ROM drive or a hard disk, insert something into an expanded port, or press any buttons.

Abstract: A folio shielding mechanism suitable for protecting an operation surface of a host is provided. The folio shielding mechanism includes a first shell, a second shell, and a transmission module. The transmission module is disposed on a first supporting surface of the host adjacent to the operation surface, and is connected to the first shell and the second shell. When the first shell is moving towards a first direction, the second shell is driven by the first shell through the transmission module and moving towards a second direction opposite to the first direction, so that the first shell and the second shell would be either joined together above the operation surface for covering the operation surface or apart from each other for exposing the operation surface.