A cabinet for storing a plurality of rack mount computers is described. The rack mount computers respectively include a plurality of hosts each having a hard disk. The cabinet includes a plurality of drawer-shaped chassis. They are arranged side by side, for respectively contain the hosts. At least one of the rack mount computers can be pulled out by pulling out the drawer-shaped chassis containing the one of the rack mount computers. The pulled drawer-shaped chassis has an L-shaped cap on the hard disk of the host of the pulled rack mount computer.