A new Model D42 has been designed to take advantage of DLT 8000 Digital Linear Tape Drives and Cartridges. Each 3584 Model D42 expansion frame contains from 1 to 12 DLT 8000 tape drives, each having a native data transfer rate of 6 MB/sec and a cartridge capacity of 40 GB. Using data compression, the DLT 8000 drives have an effective data rate of up to 12 MB/sec and a cartridge capacity of up to 80 GB (with 2: 1 compression) on DLTtape IV media. A 3584 UltraScalable Tape Library with five D42 frames has a capacity of up to 1784 DLTtape slots and 229 LTO Ultrium slots, resulting in a maximum native data capacity of 22.9 TB on LTO Ultrium media and 71.4 TB on DLTtape.Each 3584 Model D42 can be partitioned into six logical libraries. Multipath architecture allows system sharing with multiple homogeneous or heterogeneous hosts. The optional StorWatch Specialist allows Internet access and control using popular Web browsers. The 3584 Model D42 can be combined with existing Models L32 and D32 to provide mixed media support and host sharing.