IBM 3490, 1/2 ?, 800 MB Tapes The IBM 3490 allows you to back up your data with confidence. Offering 800 MB of native capacity, 3490 IBM tape cartridges offer a stable and efficient medium for storing important data. The primary benefits of the IBM Enhanced Capacity Cartridge System Tape are operational and space savings since a typical disk volume can be backed up on a single cartridge. Using the Enhanced Capacity Cartridge in the 3490 and other compatible models provides an unattended disk backup capacity of 2.4 GB (based on a 3:1 compaction ratio). Based on rigorous testing efforts, the 3490 by IBM is durable and has a shelf-life of more than 30 years when stored in a stable environment.