Netgear RN21241D – ReadyNAS 2120 1U 4- Bay, 4x1TB Desktop Drive Hardware Manual

Install the heaviest components on the bottom of the rack first, and then work up.

Use a regulating uninterruptible power supply (UPS) to protect the ReadyNAS from power surges and
voltage spikes and to keep your system operating in case of a power failure.

Allow any hot-plug drives and power supply modules to cool before touching them.

Always keep the rack's front door and all panels and components on the servers closed when not
servicing them to maintain proper cooling.