Internal Magnetic Media344 iSeries Handbook25 GB ¼-Inch Internal Cartridge Tape Unit TechnologyThe 25 GB tape can be used for save/restore, Alternate IPL, program distribution, migration,and ¼-inch Cartridge tape exchange.Tape tensioning control improvements in the tape unit eliminate the need for anauto-retension pass during the data cartridge load sequence. This is a major time savingsince the auto-retension pass on earlier QIC tape units can take up to five minutes. The TapeUnit retensions the data cartridge only when a loss of tension is detected. For typicaloperating conditions, this is expected to happen infrequently.However, the tape compression used by the #6381/#6481 2.5 GB and#4482/#4582/#6382/#6482 4 GB tape drives is not compatible with the compaction on the#4486/#4586/#6386/#6486 25 GB tape drives. Uncompacted or uncompressed tapes arecompatible within each device’s format limitations.This tape is not compatible with System/36 tape units. For read and write compatibility, referto internal tape read/write compatibilities table on page 339.50 GB ¼-Inch Cartridge Tape Unit TechnologyThe 50 GB ¼-inch Cartridge Tape Unit that may be used for save/restore, Alternate IPL,program distribution, migration, and ¼-inch cartridge tape exchange.The 50 GB tape technology provide 50GB of storage capacity. With data compression, up to100 GB can be stored per cartridge, providing unattended backup capability for a broadrange of medium sized iSeries servers.These tape features are an iSeries specific implementation of Scalable Linear Recording(SLR) technology, identified as SLR100. The unit can store data at a rate of 5 MB per second(10 Mb per second with 2:1 compression). This data rate is twice the rate of previous ¼-inchtape backup used on the iSeries. In addition to reading and writing on new SLR100 50 GB or5 GB data cartridges, there is backward write and read compatibility with MLR3(SLR50) andbackward read compatibility with MLR1(DC 5010) tape formats.This tape is not compatible with System/36 tape units. For read and write compatibility, referto internal tape read/write compatibilities table on page 339.Individual Internal Tape Features#4482 4 GB ¼-Inch Cartridge Tape UnitCan be mounted in the system unit of Models 830 and 840, and in the #5074/#5079 PCIExpansion Towers. The #4482 is a CIF.
