IBM i series Handbook page 373

Internal Magnetic Media
compressed with a data transfer rate of 1.5 MB/s (native) and 3 MB/s (with compression)
using a 1200-foot cartridge tape.
Tape tensioning control improvements in the tape unit eliminate the need for an
auto-retension pass during the data cartridge load sequence. This is a major time saver since
the auto-retension pass on earlier QIC tape units can take up to five minutes. The #6485
Tape Unit retensions the data cartridge only when a loss of tension is detected. For typical
operating conditions, this is infrequent.
It may be used for save/restore, Alternate IPL, program distribution, migration, and QIC tape
exchange.
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
#6385/#6485 13 GB. Uncompacted or uncompressed tapes are compatible within each
device's format limitations.
This tape is not compatible with System/36 tape units. For read and write compatibility, refer
to internal tape read/write compatibilities table on page 339.
16 GB ¼-Inch Internal Cartridge Tape Unit Technology
This tape can be used for save/restore, Alternate IPL, program distribution, migration, and
¼-inch cartridge tape exchange. Backward read/write capability to the previous MLR1-S
(Fjord) format and backward read capability to the last three QIC (Fjeld) formats protects the
customer's investment in QIC technology.
It provides 16 GB capacity native and 32 GB capacity compressed with a data transfer rate of
1.5 MB/s (native) and 3 MB/s (with compression) using a 1500-foot cartridge tape.
It also is capable of 13 GB capacity native and 26 GB capacity compressed with a data
transfer rate of 1.5 MB/s (native) and 3 MB/s (with compression) using a 1200-foot cartridge
tape.
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
#4483/#4583/#6383/#6483 16 GB. The #6385/#6485 uncompacted or uncompressed tapes
are compatible within each device's format limitations.
This tape is not compatible with System/36 tape units. For read and write compatibility, refer
to internal tape read/write compatibilities table on page 339.
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Internal Magnetic Media