The Storage Technology Corporation produces some of NSA's recording media storage libraries. This machine is an example of an automated tape cartridge system. It was designed for large, complex, high-performance environments, such as NSA's. It has the capacity for 6,000 tape cartridges each holding 50 gigabytes of data: a total of 300 terabytes (300 terabytes would fill enough 8.5×11 paper to circle the globe more than 3,000 times!). Using a robotic arm, this StorageTek machine is capable of exchanging 175 cartridges per hour.