The simplified installation of 3.5-inch and 2.5-inch hard disks in 19-inch rackmount enclosures is made possible by flexibly expandable backplane modules from Jou Jye Computer. The horizontal position of the printed circuit board (PCBA) enables sensible air circulation, which makes performance and reliability possible for various application areas. The backplane modules are made of stainless steel and rustproof steel, and include plastic panels, safety locks, anti-vibration rails and plastic cushioning components to protect the hard disks.