Imation 4mm DDS-1, 2/4GB The Imation DDS-1 offers 2 GB of native storage capacity and 4 GB of compressed storage capacity for constantly growing data systems. You can be sure you are gaining a cost-effective and highly reliable tape cartridge in the DDS-1 Imation. Imation continues to be a leader within the data storage industry, thus you can be sure your most important data will be safe for years to come.