The Digital Linear Backup Tape Technology DLT
Digital Linear Tape DLT was previously known as CompacTape. DLT is a magnetic tape media data storage technology. The DLT tape was introduced and developed by Digital Equipment Corporation DEC from 1984 onwards. Quantum purchased the DLT technology in 1994. Quantum Corporation currently manufactures the drives and licenses the trademark and technology. The new and higher capacity version of DLT tape is called the SDLT Super DLT.
DLT Technology is thriving as one of the most successful, widely-available technology platforms ever built. Over 3.3 million drives and over 130 million media cartridges have been shipped to date. DLT drives are recognized worldwide as the industry standard. In fact, 98% of FORTUNE 500 businesses trust their mission-critical data to DLT Technology. DLT Technology provides a variety of automation-ready solutions suited to the business continuity needs.
DLT uses linear serpentine recording with multiple tracks on half-inch (12.7 mm) wide tape. The cartridges contain a single reel. The tape is pulled out of the cartridge by means of a leader tape attached to the takeup reel inside the drive.
During the load process the drive leader tape is buckled to the cartridge leader.
The tape speed and tension are controlled electronically via the reel motors and there is no capstan. The tape is guided by 4 to 6 rollers. These rollers only touch the back side of the tape and the tape material is metal particle tape (MP/AMP)
The SDLT backup tape has an optical servo system that reads servo patterns on the back of the tape, in order to keep the data tracks on the front of the tape correctly aligned with the read/write heads. This is important for newer tape media, which have very thin dense data tracks; 256, 384 and 768 data tracks on a half inch wide tapes are now common. DLT7000 and 8000 tilt the head backward and forward to reduce crosstalk between adjacent tracks through azimuth. This process is called Symmetric Phase Recording
All SDLT drives support hardware data compression. The most commonly used compression factor is of 2:1. This compression is generally only achievable for text data. 1.3:1 to 1.5:1 is a more realistic factor across a file system. The drive compression applied to pre-compressed data can actually make the written data larger than having compression turned off in the tape drive. Current manufacturers of cartridges for the DLT SDLT backup tape media cartridges market are Fujifilm, IBM, HP, Quantum, Sony, Maxell and Imation. VStape is made by Sony. The DLT backup tape uses the WORM Write Once Read Many technology. A new naming convention took effect in 2005, calling the performance line DLT-S and the value line DLT-V
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