This Techworld document tabulates details of the Value DLT and SuperDLT tape formats and includes road map details where available. These are entry-level and mid-range tape market products from Quantum.
Quantum initiated its Digital Linear Tape (DLT) series of products with DLT-2000, now defunct. DLT proved very popular as it developed and became a mid-range leader, displacing Mammoth in the process. Tracks are wtitten is a serpentine way parallel to the edge of the tape. The media is a half-inch wide.
The new Value DLT line replaces the relatively recent DLT formats which are listed here for reference:-
|Raw Transfer Rate||1.5MB/sec||5MB/sec||6MB/sec|
|Compressed Transfer Rate||3MB/sec||10MB/sec||12MB/sec|
The main technical difference between DLT7000 and DLT 8000 was the addition of a Ferrite head. All three formats use the same DLTtapeIV media.
In 2001 Quantum introduced its higher capacity SuperDLT drive. Over the next couple of years there was a re-positioning and development of the DLT line into a ValueDLT line which we cover next.
|Raw Transfer Rate||3MB/sec||8M/sec||15MB/sec||30MB/sec|
|Compressed Transfer Rate||6MB/sec||16MB/sec||30MB/sec||60MB/sec|
This is Quantum's super tape offering, the one that directly competes with the various LTO Ultrium formats. Once again it is a half inch linear tape format, like the original DLT and VS-nnn formats. There are five generations on the roadmap.
|Raw Transfer Rate||11MB/sec||16M/sec||c32MB/sec||40-80MB/sec||c100MB/sec|
|Compressed Transfer Rate||22MB/sec||32MB/sec||c64MB/sec||80-160MB/sec||c200MB/sec|
The availability dates are: SDLT220 - 2001; SDLT320 - 2002; SDLT600 - 2003; SDLT1200 - 2004; SDLT2400 - c2006. SDLT220 and 320 use SuperDLT 1 tape media whereas SDLT600 uses a new SDLT media. SDLT220 is no longer listed as a current format on the Quantum DLT web site. VS320 overlaps it in capacity.
SDLT 320 is backward-read and -write compatible with SDLT220, and backward-read compatible with DLT8000, DLT7000, DLT4000 and DLT VS80 using DLTtapeIV media. SDLT 600 is now available and is backward-read compatible with SDLT 320, SDLT 220 and DLT VS160 drives.
SDLT1200 and 2400 planned interfaces include Serial Attach SCSI (SAS), Ultra 320 SCSI and Fibre Channel. SDLT1200 performance is expected to be greater than 50 MB/sec native and 100 MB/sec compressed. SDLT 2400 performance is expected to be greater than 100 MB/sec native and 200 MB/sec compressed.
The next articles in this tape format series will look at the proprietary StorageTek and IBM formats.