A computer enclosure includes a cage (10), a small drive bracket (30), and a cover (80). The cage includes a front panel (12) and a side panel (14). The front panel is rearwardly stamped to integrally form a vertical plate (122) opposing the side panel. The vertical plate and the side panel each form two locking members (132, 142). The small drive bracket includes two flanges (40, 46), each defining two locking cutouts (42, 48). A horizontal plate (60) is secured on the small drive bracket. The combined small drive bracket and horizontal plate is attached within the cage, with the locking members engaging in the corresponding locking cutouts. The horizontal plate is connected between a bottom portion of the vertical plate and the side panel. The combined vertical plate, side panel and horizontal plate cooperatively constitute a large drive bracket (70). The cover is attached to the cage.