Long-term archival library systems are automated, robotic devices that index and load various types of media (e.g., tape or optical disks) into readers for retrieval of old studies. These devices can accommodate several different types of media and are expandable to hundreds of terabytes (one terabyte = 1000 gigabytes). As media design changes, and the cost per terabyte goes down, new jukeboxes and other long-term archival systems will be developed. Table 102-1 shows a comparison of long-term archive media. One concern in this rapidly changing technology is that the ability to read current media in several years may be dependent on keeping obsolete technology operational. An analogy would be trying to read eight-inch floppy disks today