User's Manual

Configuring and Operating the DLT4500 Mini-Library
DLT4000/DLT4500/DLT4700 Cartridge Tape Subsytem 4-21
4.9 Selecting Density
This section describes the mini-library's density select feature.
The user can select density by using any of the following:
1. On a write from beginning of tape (BOT), tape density is selected by one of the
following:
• Front panel Density Select mode
_________________________ NOTE ____________________________
The user can perform a front panel density selection at any time, but the
selection takes effect only on the next write from BOT.
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• Programmable host selection via your operating system
• Native default density 20 GB, 30 GB or 40 GB at 2:1 Compression
(assuming you did not use the Select mode or the host selection)
2. On all read operations and all write append operations, the recorded density is the
density to be used.
_________________________ CAUTION _________________________
Doing any write from BOT destroys existing data on tape.
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4.9.1 Front Panel Density Select Mode
To select density via the front panel:
1. If a tape is loaded in the drive, the display shows the tape's pre-recorded density.
2. The user can use the mini-library OCP at various times, not just after you load a
tape. Density selection is inactive until you issue the write from BOT command.
The controller remembers the density selection state until you do one of the
following:
• Change the density selection
• Press the Open button to open the door
3. Enter Density Select mode by pressing the Display Mode button and then the
Select button on the OCP. Using Density Select mode always overrides a host
selection.