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QIC DC6250 Tape
Quarter inch cartridge tape (abbreviated QIC, commonly
pronounced "quick") is a magnetic tape data storage format
introduced by 3M
in 1972, with derivatives still in use as of 2009. QIC comes in a
rugged enclosed package of aluminum and plastic that holds two tape
reels driven by a single belt in direct contact with the tape. The tape
was originally 1⁄4-inch
(6.35 mm) wide and anywhere from 300 to 1,500 feet (91 to 460 m) long.
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QIC DC6525 Tape
Data is written to tape in linear tracks in what is called "serpentine"
mode, where the tracks alternate direction by use of a head switch or
step. Since the introduction of the format, QIC has been widely used and
many variations exist. There is a QIC trade association that
publishes QIC standards which include interfaces and logical formats, to
a very large extent it was the efficiency and openness of this
organisation which encouraged hardware and software developers to use
this type of drive and media.
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QIC DC9120 Tape
The QIC cartridge is distinguished from other types of tape cartridges
by the fact that it contains an endless drive belt which is moved at a
uniform speed by a motorised capstan. Since
the belt is in contact with the tape, this ensures both that the tape
moves at uniform speed, and that neutral tension is maintained at all
times. This is in contrast to cassette tapes or
DATs where the tape is moved past the
head by a capstan and pinch wheel, but the takeup reel is driven by a
servo motor or slipping clutch.
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QIC DC9135 Tape
The tape in a QIC cartridge is not physically attached to the reels and
is never completely unwound. This is again different from other
cassettes or cartridges, which generally have some form of clip
anchoring on at least one end of the tape. To ensure that the tape is
never completely unwound, each end has a small beginning or end of tape
hole which is detected by an optical sensor, and an "early warning" hole
further from each end. If a defective drive—for example with fluff in a
sensor—winds the tape past the BOT or EOT marker, the tape w
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QIC DC9200 Tape
The first QIC tape format was the 5.875 in by 3.875 in (150 x 99mm) Data
Cartridge (DC) format with two internal belt-driven reels and a
metal base. The original product, the DC300, had 300 feet of tape and
held 200 kilobytes. Various QIC DC recording formats have appeared over
the years
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QIC DC9250 Tape
The design of the QIC tape cartridge is very robust:
the aluminium
baseplate is an eighth of an inch thick, and the robust plastic cover
can withstand abuse and impacts that would damage other tape formats.
However, because the tape is belt-driven, seeking back
and forth can
eventually cause the tape to become unevenly tensioned. It is therefore
necessary to periodically retension the cartridge. This is accomplished
by winding the tape from beginning to end and back in one operation,
allowing the belt to equalize itself. For newer QIC drive
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QIC-tapes Product List
QIC DC6250 Tape
QIC DC6525 Tape
QIC DC9120 Tape
QIC DC9135 Tape
QIC DC9200 Tape
QIC DC9250 Tape
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