Travan
The Travan standard is also QIC-based and represented an attempt to untangle the chaos of more than 120 QIC standards. Technically, the Travan tapes are far superior to the QIC models, as they were designed for long-term storage and greater reliability. For that reason, however, the media were also more expensive than the ones for DAT drives.
| Header Cell - Column 0 | TR-1 | TR-2 | TR-3 | TR-4 | TR-5 | TR-6 |
|---|---|---|---|---|---|---|
| Capacity | 400 MB | 800 MB | 1.6 GB | 4 GB | 10 GB | 20 GB |
| Maximum transfer rate | 125 kB/s | 125 kB/s | 250 kB/s | 1.16 MB/s | 1.83 MB/s | 4 MB/s |
| Tracks | 36 | 50 | 50 | 72 | 108 | 144 |
With the introduction of the first Travan standard, the tapes at first became increasingly longer, meaning that Travan cassettes were somewhat larger than Mini-QIC. Should you run into the term NS, this refers to the Travan-related systems by Imation, which differ from 3M-Travan in their hardware compression. Good Travan streamers support the SCSI protocol's block specifications, meaning that the access to tape content can be realized relatively quickly.
For more information visit: www.imation.com .
DAT
DAT stands for Digital Audio Tape. It's not music that's written onto them but data in the DDS format (Digital Data Storage). The DAT tape is 4mm wide and, in contrast to QIC and Travan, it employs the Helical scan. As a result, DAT streamers are naturally not among the faster models but rather serve the purpose of backing up larger amounts of data. In addition, prices are at least twice that of QIC and Travan devices.
| Standard | Capacity | Maximum Transfer Rate |
|---|---|---|
| DDS | 2 GB | 550 kB/s |
| DDS-1 | 2 GB | 1.1 MB/s |
| DDS-2 | 4 GB | 1.1 MB/s |
| DDS-3 | 12 GB | 2.2 MB/s |
| DDS-4 | 20 GB | 4.8 MB/s |
Too bad that DAT is highly sensitive. The complicated route that the tape takes and the great forces emerging through friction (these develop when the spindle is touched) create enormous wear and tear. In addition, the writing and reading heads are moved out of position quickly, meaning that tapes sometimes cannot be read properly.
For more information visit www.datmgm.com/ .
