Table 4-6 presents the maximum capacities for four DLT devices with three different media types. All the values represent maximum capacities when written in non-compressed mode.
| DLT 2000 | DLT 2000XT | DLT 4000 | DLT 7000 | |
|---|---|---|---|---|
| Compact III | 10 GB | 10 GB | 10 GB | 10 GB |
| Compact IIIXT | n/a[1] | 15 GB | n/a | 15 GB |
| Compact IV | n/a | n/a | 20 GB | 20/35 GB |
For all supported cases except one, there is a unique density/format for a particular device-media pair. In these cases, the density is automatically selected based upon the media capacity. The one exception is the DLT 7000 loaded with Compact IV media. In this case you may choose between the native DLT 7000 density of 35 GB or the native DLT4000 density of 20 GB.
Note that when Compact III or Compact III XT media is loaded into a DLT 7000, the drive drops to the lower, native density for that media.
To select compression, specify the device name ending in "c", for example, /dev/mt/tps3d2.4000c for DLT 4000 with compression. (Refer to tps(7M) for tape device naming conventions.)