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Data Compression
A technique that allows more data to be stored on a given tape. Most manufacturers assume a 2 to 1 data compression can be achieved (i.e. 2 MB of data on 1 MB of tape), but actual results depend on the data being stored.

Gigabyte (GB)
A measure of data storage, equivalent to 1,000 megabytes (MB), or approximately 1 billion bytes of data.

Helical Recording
A way to write information to a tape that involves spinning the writing head in the reverse direction to the tape movement. Helical scan drives can hold more information on a given tape length than a standard recording head. VCRs are a common example of helical recording.

Incremental Backup
A backup method which only saves the files within a system that have changed since the last backup. Incremental backups require much less backup space, but take longer to restore after a crash or disaster. Many businesses conduct full backups each week, while conducting the quicker incremental backups each day.

Jukebox
Large networks often need more storage capacity than is available in a single tape. A jukebox automatically loads and unloads tapes from the player during a backup.

Native Capacity
The storage capacity of a drive when no compression techniques are used. Comparing drives based on their native capacity eliminates differences in manufacturer assumptions concerning file compression.