Proposed is a disk controller capable of notifying that a hard disk drive needs to be replaced even when the power of such hard disk drive is turned off. The system includes a multi-layer display, an associated logic device and a display controller in communication therewith and configured to receive signals from the logic device. The asphyxia-preventing restraining device comprises an ALRELR retractor. The seals maintain sealing engagement during assembly and thermal distortion during turbine usage. An expandable antenna connects to the antenna connector. Thus, the film shell is coated on the periphery of the foamable material, so that the film shell is combined with the foamable material rigidly and stably, thereby preventing the foamable material from detaching from the film shell due to a pulling action of an external force.