Abstract: A server comprises six sets of hard disk drivers as well as a floppy disk driver and an optical disk driver. The floppy disk driver adopts a compact floppy disk driver used for notebook and the optical disk driver adopts a compact optical disk driver used for notebook computer to reduce occupied volume. Therefore, the number of the hard disk drivers is increased to expand data storage capacity without increasing physical size.

Abstract: A computer casing is disclosed. At least one movable door plate is installed at one side of the computer casing, the movable door plate includes a first plate and a second plate. One edges of the first plate is pivotally connected to one edge of the second plate, and other edges of the first plate and the second plate are formed with engaged portions, respectively. At least one side of the computer casing is installed with an opening; and the engaged portions of the first plate and the second plate are embedded on edges of the opening of the computer casing for selectively closing the opening.

Abstract: An extracted and positioning device of a fan is suitable to be used in industrial computers.