Like the SDX1-25C, the SDX1-35C is also an AIT-1 tape and also features a 16K MIC (Memory In Cassette), a flash memory chip which stores file tables and table of contents so that the information, data or file you are looking for in your AIT-1 tape can be easily and quickly found. The AIT-1 SDX1-35C tape also uses AME (Advanced Metal Evaporated) tape which allows it to maximize recording performance through the 100% pure cobalt formulation. And similar to the SDX1-25C, the SDX1-35C also has a DLC (Diamond Like Coating) for its tape surface for longevity and reliability. In fact the only real difference is that the SDX1-35C has a 230m length tape (as compared to the 170m length tape of the SDX1-25C) which allows it to store 35 GB of native data and up to 91 GB of compressed data (with a compression ratio of 2.6:1). You may require firmware upgrades for your AIT-1 drives to use the SDX1-35C tape cartridges.