According to 3M Data Storage Products Division, the expected shelf life of a DC
2000 mini-data cartridge is 2 to 5 years. This shelf life is based on the
active life of the lubricants used in the cartridge. The shelf life is
affected by environmental conditions (temperature, humidity, and so on). The
magnetic tape itself is rated for use, not shelf life, normally at 5000 passes.
For more information, search on "3M" in the Tech Info libray and contact their
Data Storage Products Division.