HP DDS-4 Tape, 20/40GB, Part # C5718A Compact and reliable, with superior cost-performance. DDS (4mm) are the ideal solution to high-volume backup and archiving requirements. These 40GB (compressed) capacity, easy-to-handle compact cartridges provide cost efficient backup and long term archiving for years. Features: Capacity: 20GB (native) / 40GB (compressed) * Tape Length: 150m * Durability: 5,000 head passes * Built tough for a long working life * Low cost, High performance format * Enhanced Reliability & Durability * Minimal error rate, higher efficiency * Media recognition system (MRS) * Smooth, stable transitions.