Digital Linear Tape

Digital Linear Tape
A Super DLT I tape cartridge

Digital Linear Tape (DLT) (previously called CompacTape) is a magnetic tape data storage technology developed by Digital Equipment Corporation (DEC) from 1984 onwards. In 1994 the technology was purchased by Quantum Corporation, who currently manufactures drives and licenses the technology and trademark. A variant with higher capacity is called Super DLT (SDLT). The lower cost "value line" was initially manufactured by Benchmark Storage Innovations under license from Quantum. Quantum acquired Benchmark in 2002.



DEC launched the TK50 tape drive for the MicroVAX II and PDP-11 minicomputers in 1984. This used 22-track CompacTape I cartridges, storing 94 MB per cartridge. The TK50 was superseded in 1987 by the TK70 drive and the 48-track CompacTape II cartridge, capable of storing 294 MB. In 1989, the CompacTape III (later DLTtape III) format was introduced, increasing the number of tracks to 128 and capacity to 2.6 GB. Later drives improved the data density of the DLTtape III cartridge into the early 1990s, up to 10 GB. The DLTtape IV cartridge was introduced by Quantum in 1994, with increased tape length and data density, initially offering 20 GB per tape. Super DLTtape, originally capable of up to 110 GB, was launched in 2001.


DLT uses linear serpentine recording with multiple tracks on half-inch (12.7 mm) wide tape. The cartridges contain a single reel and the tape is pulled out of the cartridge by means of a leader tape attached to the takeup reel inside the drive. The drive leader tape is buckled to the cartridge leader during the load process. Tape speed and tension are controlled electronically via the reel motors; there is no capstan. The tape is guided by 4 to 6 rollers that touch only the back side of the tape. Tape material is metal particle tape (MP/AMP.)

SDLT adds 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 12-inch-wide (13 mm) tape are now common.

DLT7000 and 8000 tilt the head forward and backward to reduce crosstalk between adjacent tracks through azimuth; this is called Symmetric Phase Recording.

All (S)DLT drives support hardware data compression. The often-used compression factor of 2:1 is optimistic and generally only achievable for text data; a more realistic factor across a file system is 1.3:1 to 1.5:1. Note that drive compression applied to pre-compressed data can actually make the written data larger than having compression turned off in the tape drive.

Media are guaranteed for 30 years of data retention under specified environmental conditions; however, they are easily damaged by mishandling (dropping or improper packaging during shipment.)

Current manufacturers of cartridges for the DLT/SDLT market are Fujifilm, Hitachi/Maxell and Imation. VStape is made by Sony. All other companies/brands (even Quantum) are contractors and/or resellers of these companies.

A new naming convention took effect in 2005, calling the performance line DLT-S and the value line DLT-V.

DLT includes Write Once Read Many (WORM) capability.[1]

In February 2007, Quantum stopped developing the next generations of DLT drives (S5 and V5) after insufficient market acceptance of the S4 and V4 drives, shifting its drive strategy to LTO.



Drive Capacity (GB) Interface Data Rate (MB/s) Date Media
TK50/TZ30 0.1 proprietary/SCSI 0.045 1984 CT I
TK70 0.3 proprietary 0.045 1987 CT II
THZ01/DLT260/Tx85 2.6 DSSI/SCSI 0.8 1989 DLT III
THZ02/DLT600/Tx86 6 DSSI/SCSI 0.8 1991 DLT III
DLT2000/Tx87 10 Fast SCSI-2 1.25 1993 DLT III
DLT2000XT 15 Fast SCSI-2 1.25 1995 DLT IIIXT
DLT4000/Tx88 20 Fast SCSI-2 1.5 1994 DLT IV
DLT7000/Tx89 35 Fast/Wide SCSI-2 5 1996 DLT IV
DLT8000 40 Fast/Wide SCSI-2 6 1999 DLT IV
SDLT 220 110 Ultra-2-Wide SCSI 11 1998 SDLT I
SDLT 320 160 Ultra-2-Wide SCSI 16 2002 SDLT I
SDLT 600 300 Ultra-160 SCSI/FC 2Gb 36 2004 SDLT II
SDLT 600A 300 GbE (FTP, HTTP) 36 2005 SDLT II
DLT-S4 800 Ultra-320 SCSI/FC 4Gb/SAS 60 2006 S4
DLT-S4A 800 GbE (FTP, HTTP) 60 2007 S4
Value line
DLT1 40 Fast/Wide SCSI-2 3 1999 DLT IV
DLT-VS80 40 Fast/Wide SCSI-2 3 2001 DLT IV
DLT-VS160 80 Ultra-2-Wide SCSI 8 2003 VS1
DLT-V4 160 Ultra-160 SCSI/SATA/USB[2] 10 2005 VS1


Name Formats (GB) Color Supported by (ro=read only)
CompacTape I 0.1 Gray TK50/TZ30, TK70 (ro)
CompacTape II 0.3 Gray TK70
DLTtape III 2.6, 6, 10 Light brown DLT260/600, DLT2000/2000XT/4000/7000
DLTtape IIIXT 15 White DLT2000XT/4000/7000/8000
DLTtape IV 20, 35, 40[a] Dark brown DLT4000/7000/8000, DLT1/DLT-VS80[a], SDLT220/320 (ro)
Cleaning Tape III 20 cleans Beige DLT2000/2000XT/4000/7000/8000
SDLTtape I 110, 160 Dark green SDLT220/320, SDLT600 (ro), DLT-S4 (ro)
SDLTtape II 300 Dark blue SDLT600, DLT-S4 (ro)
DLTtape S4 800 Dark purple DLT-S4
SDLT Cleaning Tape 20 cleans Light gray SDLT220/320/600, DLT-S4
DLTtape VS1 80, 160 Ivory/Black VS160, DLT-V4, SDLT600 (ro)
DLT VS Cleaning Tape 20 cleans Brown DLT1, DLT-VS80
DLT VS160 Cleaning Tape 20 cleans Light gray DLT-VS160, DLT-V4

a DLTtape IV can support both DLT4000/7000/8000 and DLT1/DLT-VS80 for full functions, however, once DLTtape IV media has been written to or formatted in a DLT7000/8000 drive, this media cannot be read, written to, or formatted in a DLT1/DLT-VS80 drive unless it is degaussed. Once the media has been written to or formatted in a DLT4000 drive, the media cannot be written to or formatted in a DLT1/DLT-VS80 drive unless it is degaussed but it can be read. This is because the DLT1/VS series use a different recording format that is not fully supported by the other family.

Tapes written in value series drives can typically be read (and often written to) in higher end drives of a similar vintage. The drive's technical specifications should contain interoperability options.


External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Digital Linear Tape —   [engl.], DLT …   Universal-Lexikon

  • Digital Linear Tape — Speichermedium Digital Linear Tape (DLT) Externes DLT 7000 Laufwerk mit eingelegtem Band (darüber ein externer DVD Brenner als Größenvergleich) Allgemeines Typ Magnetband Kapazität …   Deutsch Wikipedia

  • Digital Linear Tape — Pour les articles homonymes, voir DLT. Cartouche Super DLT I Digital Linear Tape (DLT) est une technique de sauvegarde de données informatiques sur …   Wikipédia en Français

  • Digital Audio Tape — can also refer to a compact cassette with digital storage: DCC or one of several digital reel to reel formats Digital Audio Tape A 90 minute DAT cart …   Wikipedia

  • Digital Equipment Corporation — Industry Computer manufacturing Fate Assets were sold to various companies. What remained was sold to Compaq. Successor …   Wikipedia

  • Tape drive — DDS tape drive. Above, from left right: DDS 4 tape (20 GB), 112m Data8 tape (2.5 GB), QIC DC 6250 tape (250 MB), and a 3.5 floppy disk (1.44 MB) A tape drive is a data storage device that reads and performs digital recording, writes data on a… …   Wikipedia

  • Digital Equipment — Logo der Digital Equipment Corporation Digital Equipment Corporation, auch als DEC oder Digital bezeichnet, war ein US amerikanisches Unternehmen mit Firmensitz in Maynard, Massachusetts, in einer alten Baumwollspinnerei („The Mill“). Das… …   Deutsch Wikipedia

  • Digital cassettes — Digital audio cassette formats introduced to the professional audio and consumer markets: Digital Audio Tape (or DAT) is the most well known, and had some success as an audio storage format among professionals and prosumers before the prices of… …   Wikipedia

  • Digital Equipment Corporation — Rechtsform Corporation Gründung 1957 Auflösung …   Deutsch Wikipedia

  • Digital cinematography — Arriflex D 21 Panavision Genesis …   Wikipedia