Keeping spare components on hand for quick and easy swapping of crucial parts makes good business sense. With the high hourly rates generated by editing suites and other mission-critical applications, it's essential to eliminate even the smallest storage glitch. That's why this kit includes a spare RAID controller, power supply, and fan module for the VTrak E-Class RAID subsystem. And there's no special training or certification required for the tool-less hot-swap of these components.