A chassis input/output (I/O) module adapted to be removably installed onto a mass storage chassis assembly carrying one or more mass storage sub-assemblies , the chassis input/output (I/O) module comprising: an I/O module shell ; a main I/O connector externally available on the I/O module shell ; a plurality of sub-assembly connectors externally available on the I/O module shell and configured to engage sub-assembly connectors of the one or more mass storage sub-assemblies installed in the mass storage chassis assembly ; one or more power supply modules positioned within the I/O module shell ; and an interface module positioned within the I/O module shell and electrically coupled to the main I/O connector , the plurality of sub-assembly connectors , and the one or more power supply modules , with the interface module configured to: regulate operations of the one or more mass storage sub-assemblies installed in the mass storage chassis assembly ; regulate provision of electrical power from the one or more power supply modules to the one or more mass storage sub-assemblies ; facilitate exchange of electrical signals between the one or more mass storage sub-assemblies and the main I/O connector ; and regulate provision of electrical power from the one or more power supply modules to one or more cooling fans to cause the one or more cooling fans to create a cooling airflow to flow toward the one or more mass storage sub-assemblies after passing through the I/O module shell . an I/O module shell ; a main I/O connector externally available on the I/O module shell ; a plurality of sub-assembly connectors externally available on the I/O module shell and configured to engage sub-assembly connectors of the one or more mass storage sub-assemblies installed in the mass storage chassis assembly ; one or more power supply modules positioned within the I/O module shell ; and an interface module positioned within the I/O module shell and electrically coupled to the main I/O connector , the plurality of sub-assembly connectors , and the one or more power supply modules , with the interface module configured to: regulate operations of the one or more mass storage sub-assemblies installed in the mass storage chassis assembly ; regulate provision of electrical power from the one or more power supply modules to the one or more mass storage sub-assemblies ; facilitate exchange of electrical signals between the one or more mass storage sub-assemblies and the main I/O connector ; and regulate provision of electrical power from the one or more power supply modules to one or more cooling fans to cause the one or more cooling fans to create a cooling airflow to flow toward the one or more mass storage sub-assemblies after passing through the I/O module shell . regulate operations of the one or more mass storage sub-assemblies installed in the mass storage chassis assembly ; regulate provision of electrical power from the one or more power supply modules to the one or more mass storage sub-assemblies ; facilitate exchange of electrical signals between the one or more mass storage sub-assemblies and the main I/O connector ; and regulate provision of electrical power from the one or more power supply modules to one or more cooling fans to cause the one or more cooling fans to create a cooling airflow to flow toward the one or more mass storage sub-assemblies after passing through the I/O module shell . <EOS>