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: "D" : DLT
DLT
- DLT
- Digital Linear Tape. Tape storage developed in the late seventies by
Digital Equipment Corporation (otherwise known as DEC),
and the basis for successive generations of DLT tape drive which higher
storage capacities and transfer rates. Most DLT drives are backwards
compatible but this is not guaranteed, so check. DLT tapes use half inch
tape media, fully enclosed in a sealed case which is designed only to
open when the tape is in the drive.
| Type |
Native capacity 1 |
Notional capacity 2 |
Native backup rate 3 |
| DLT 2000 |
10GB |
20GB |
1.25Mbps |
| DLT 4000 |
20GB |
40GB |
|
| DLT 7000 |
35GB |
70GB |
5Mbps |
| DLT 1 |
40GB |
80GB |
3Mbps |
| DLT 8000 |
40GB |
80GB |
6Mbps |
| SDLT 1 |
110GB |
220GB |
11Mbps |
| SDLT 220 |
| SDLT 320 |
160GB |
320GB |
16Mbps |
Notes:
- Native capacity is with no compression applied.
- Notional capacity is with hardware compression applied. Quoted
figures normally assume a compression ratio of 2:1 but this will
vary with real data.
- Drives are often quoted with a "Notional backup rate",
which is the rate at which data can be written to the tape with
an assumed 2:1 compression ration. The notional backup rate is
therefore double the native backup rate.
DLT has generally lost out in favour of LTO.
See also: DDS, SDLT,
LTO.
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