Hardware Implementation

2.4.2Selecting Density

This subsection describes the drive’s density select features.

CAUTION

If a prerecorded tape is reused and a WRITE from the beginning of tape (BOT) executes (No Append Write), any data already recorded on the tape will be lost. This includes density changes, since they occur only when writing from BOT.

NOTES

On all READ and all WRITE APPEND operations, the data density that already exists on the tape cartridge remains the density.

Default density of a DLTtapeTM III cartridge is 10.0 GB, native. The only optional selections for DLTtape III cartridges are 2.6 GB, 6.0 GB, 10.0 GB (compression OFF), or 20.0 GB (compression ON).

Default density of a DLTtape IIIxt cartridge is 15.0 GB, native (compression OFF), or 30.0 GB (compression ON). No other density is supported.

Default density of a DLTtape IV cartridge is 35.0 GB, native (compression OFF), or 70.0 GB (compression ON). A density of 20.0 GB native (compression OFF), or 40.0 GB (compression ON) is user- selectable. No other density is supported.

When writing from BOT, tape density may be changed by:

∙Using the Density Select Button on the front panel of the tape drive. Using the Density Select Button always overrides density selection via the host.

∙Using the operating system to issue a density designation. In this case, the amber Density Override LED on the tape drive’s front panel turns off, indicating an automatic or host density selection.

∙Native default density for the DLTtape IV is 35.0 GB (70.0 GB, compressed), assuming the Density Select Button was not used or that host selection of density via the operating system was not invoked.

Quantum DLT 7000 Tape Drive

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Quantum Instruments DLT 7000 manual Selecting Density, Hardware Implementation
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DLT 7000 specifications

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