Rotronics Wafadrive

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Wafadrive packaging.

Rotronics Wafadrive shown with two Wafa tapes, a blank 64K and software release tape

Front and back of a Rotronics 64K Wafa tape

The Rotronics Wafadrive was a peripheral for the Sinclair ZX Spectrum home computer, intended to compete with Sinclair's ZX Interface 1 and ZX Microdrive.

The Wafadrive comprised two continuous loop "stringy floppy" tape drives, an RS-232 interface and Centronics parallel port.

The drives could run at two speeds, high speed for seeking and low speed for reading/writing, which was significantly slower than that of Microdrives. The cartridges (or "wafers"), the same as those used in Entrepo stringy floppy devices for other microcomputers, were physically larger than Microdrive cartridges. They were available in three different capacities, nominally 16 kB, 64 kB or 128 kB. The larger sizes having the disadvantage of slower access, due to the longer length of tape.

The same drive mechanism, manufactured by BSR, and cartridges were used in a similar device known as the Quick Data Drive (QDD), designed to connect to the cassette port of Commodore 64 and Commodore VIC-20 home computers.

Magnetic tape data storage formats

Linear

Wide (19 - 25.4 mm)	TX-2 Tape System (1958) IBM 7340 (1961) LINCtape (1962) DECtape (1963)

Half inch (12.7 mm)	UNISERVO (1951) IBM 7 track (1952) 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) DECtapeII (1979)

Stringy (1.58–1.9 mm)	Exatron Stringy Floppy (1979) ZX Microdrive (1983) 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)

External links

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