What does Rack-Mount mean?

A rack mount is where a hardware device can be mounted in a rack or the actual rack, often used within large companies to hold their network servers, routers, switches, or other network devices.

The height of a rack-mounted device is in units or rack units (U or RU), and 1U or 1RU is 1.75″ from top to bottom.

All types of electronics and computing devices come in rack-mounted packages, including servers, test instruments, telecommunications components, storage drives and A/V equipment, which are bolted to the side frames of the rack. Shelves are available for equipment that is not rack-mounted.