Digital Tape Format

Digital Tape Format is a magnetic tape data storage format developed by Sony. It uses a 1/2" wide tape, in a cassette with two reels, which is written and read with a helical scan process. The format is described by the ECMA 248 (adopted June 1998) and ISO/IEC 15731 standards. There are two sizes of tape cassettes, "S" and "L".

## Generations

Generation  | DTF-1  | DTF-2

|
|

Release Date  | 1994 | 1999
"S" Capacity (GB)  | 12 | 60
"L" Capacity (GB)  | 42 | 200
Max Speed (MB/s)  | 12 | 24

Notes:

* Both used ALDC compression
* DTF-2 used Fibre Channel or SCSI interfaces
* The tape cassettes are similar to those of Sony Betacam.

## External links

* ECMA 248 Specification of DTF-1. [1]
* ECMA 315 Specification of DTF-2. [2]
* Brochure for DTF-1 drive with specs
* DTF at the Computer Desktop Encyclopedia, including images

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Magnetic tape data storage formats

Linear|

| Wide (19–25.4 mm)|

* IBM 7340 (1961)
* LINCtape (1962)
* DECtape (1963)
* CDC 626 (1966)

|

Half inch (12.7 mm)|

* UNISERVO (1951)
* IBM 7 track (1952)
* TX-2 Tape System (1958)
* 9 track (1964)
* IBM 3480 (1984)
* DLT (1984)
* IBM 3590 (1995)
* T9840 (1998)
* T9940 (2000)
* LTO Ultrium (2000)
* IBM 3592 (2003)
* T10000 (2006)

Eight millimeter (8 mm)|

* Travan (1995)
* IBM 3570 MP (1997)
* ADR (1999)

Quarter inch (6.35 mm)|

* QIC (1972)
* SLR (1986)
* Ditto (1992)

"Eighth" (0.15) inch (3.81 mm)|

* KC standard, Compact Cassette (1975)
* HP DC100 (1976)
* Tarbell Cassette Interface (1976)
* Commodore Datasette (1977)
* DECtape II (1979)
* IBM PC Cassette (1981)

Stringy (1.58–1.9 mm)|

* Exatron Stringy Floppy (1979)
* ZX Microdrive (1983)
* QL Microdrive (1984)
* Rotronics Wafadrive (1984)

Helical|

| Three quarter inch (19 mm)|

* Sony DIR (19xx)
* Ampex DST (1992)

|

Half inch (12.7 mm)|

* Redwood SD-3 (1995)
* DTF (19xx)
* SAIT (2003)

Eight millimeter (8 mm)|

* Data8 (1987)
* Mammoth (1994)
* AIT (1996)
* VXA (1999)

Four millimeter (3.81 mm)|

* DDS/DAT (1989)

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