For_Drive_Type - DDS Compatibility - DDS-4 Maximum_Native_Data_Capacity - 20 GB Maximum_Compressed_Data_Capacity - 40 GB HP DSS cartridges provide a great low-cost, high-capacity data archiving solution. As they feature a durability rating two times greater than the industry standard, they're the perfect backup media choice for midrange servers. They deliver faster performance and a greater storage capacity, too That translates as cartridges that require far fewer tape swaps during backup operations, saving both time and money. Every unit is also exhaustively quality tested to ensure unmatched reliability. For Drive Type: DDS Compatibility: DAT 40 DDS-3 DDS-4 Maximum Native Data Capacity: 20 GB Maximum Compressed Data Capacity: 40 GB.