A multi-case rack for an industrial computer includes a rack body and a plurality of removable cases. The removable case can be installed with either its axial end positioned ahead, thus compatible to both a front circuit board and a rear circuit board. The removable case has an anti-shock HD mount capable of holding either two 2.5″ hard drives or one 3.5″ hard drive. The removable case allows heat-dissipating fans to be installed and positioned in a screw-free, hot-swap manner. The removable cases can be readily installed into or from a rack body.