4 Hard Disk Control System Intelligent Control Management System HDD SSD Power Switch with PCI Bracket 4 way hard disk power switch management and control system Support: ATX standard chassis Advantages: safe and stable 4 way hard disk independent switch control and management system, lead-free high temperature SMT, durable. Usage: System control 4 hard disks on and off, energy saving and environmental protection, prolong the hard disk life, ensure data security.