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How to Select Density and Compression
Note Always use the default density (and compression setting) of the tape
cartridge unless you want to write a tape cartridge at a different density
so that it can be read in a lower capacity DLT drive. This will allow you to
store the maximum amount of data on the tape cartridge.
Density and compression changes take effect only when the drive starts
writing at Beginning of Tape. This means that a tape can only ever be
written at one density—entirely with or without compression.
The time you are most likely to want to select the density at which the tape
cartridge is written is immediately after loading the tape cartridge. You
can however select the density at other times.
HP SureStore DLT 40:
• You can select different densities only with type III (not IIIxt) tape
cartridges. With other tape cartridges, the setting will change back to
the default density as soon as the drive starts writing to tape.
• With DLTtape IIIxt and IV tape cartridges you can choose only to have
compression on or off; you cannot change the density.
HP SureStore DLT 70:
• With DLTtape IV cartridges, you can select only 20.0 or 35.0 GB
densities and choose to have compression on or off. If you try to select
another density, the setting will change back to the default density (35
GB) as soon as the drive starts writing to tape.
• With DLTtape IIIxt cartridges, you can only choose to have compression
on or off. Any density setting other than 15.0 GB will automatically
default back to 15.0 GB when the drive starts writing to tape.
• With type III cartridges, you can select densities of 2.6, 6.0 and 10.0 GB.
With the 10.0 GB setting, you can choose to have compression on or off.
HP SureStore DLT 80:
• With DLTtape IV cartridges, you can select only 20.0, 35.0 or 40.0 GB
densities and choose to have compression on or off. If you try to select
another density, the setting will change back to the default density (40
GB) as soon as the drive starts writing to tape.
• With DLTtape IIIxt cartridges, you can only choose to have compression
on or off. Any density setting other than 15.0 GB will automatically
Tape Cartridge Densities and Compression
Changing the Density and Compression for Writing
5-5
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