Quantum DLT 2000 Handbook page 127

data accuracy. These include parity, multi-layer cyclical redundancy
code (CRC), error detection code (EDC) and custom Reed-Solomon
Error Correction Code (see Chapters 5 and 6 to learn more).
An additional advantage provided by the DLT 7000 and DLT 8000
drives is Symmetric Phase Recording (SPR). Using SPR technology,
adjacent data tracks are recorded using alternating head angles. The
resulting herringbone pattern eliminates cross-talk interference and
the need for guard bands between tracks. This allows tracks to be
packed tighter and is one important reason the DLTtape drives offer
industry-leading capacity. SPR technology enabled us to increase
track density from 256 tpi (tracks per inch) in the DLT 4000 drive to
416 tpi in the DLT 7000 and DLT 8000 drives.
DLT1
The DLT1 drive is successfully bringing DLTtape technology to
new markets at the low end of the mid-range. The DLT1 shares
many basic design characteristics with other DLTtape drives, and
uses DLTtape IV media cartridges. The DLT1 drive provides native
capacity of 40GB and native transfer rate of 3MB/sec.
Super DLTtape Technology Details
Super DLTtape technology is an extension of DLTtape technology;
it retains all of the major features of DLTtape technology. At the
same time, Super DLTtape technology incorporates a number of
important technology innovations. The following paragraphs
briefly outline the primary similarities and differences between the
DLTtape and Super DLTtape technologies, and summarize the
technology innovations incorporated in Super DLTtape technology.
Like DLTtape technology, Super DLTtape technology uses half-inch
tape in a single-reel cartridge. It incorporates a modified Head
Guide Assembly with four rollers instead of the six used in
DLTtape technology. The resulting tape path is very similar to that
QUANTUM DLTtape HANDBOOK 11.5