IBM 3592 1/2", Magstar, 700GB/1TB/2.1TB

IBM 23R9830 - 1/2 Inch, 3592 Data Cartridge, Extended 700GB/2.1TB Capacity "JB", Backup Tape Media
IBM 3592 Tape Cartridges are designed to work with the first-generation IBM TotalStorage Enterprise Tape Drive 3592 Model J1A (3592 J1A tape drive) and the second and 3rd generation IBM System Storage TS1120 Tape Drive and TS1130 (3592 E05 and E06 tape drive models).
Cartridges are available in three lengths and in either re-writeable or WORM formats. The short length 3592 JJ/JR cartridges provide rapid access to data and the standard length 3592 JA/JW cartridges provide high capacity. The 3592 Extended Data JB and Extended WORM JX 700GB high capacity cartridges support TS 1120 tape drives only.