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helical scan
A system of recording tracks of data or signal onto magnetic tape in which the tape is wrapped partway (up to about three quarters) around the circumference of a spinning cylinder. The cylinder houses one or more reading and writing heads. The tape is also drawn linearly across this contraption. This results in the tracks being written diagonally across the face of the tape. It has the advantage of allowing an effectively higher relative speed of tape to head, allowing a much greater density of data to be held on the tape than a linear system. Used by VCRs and DAT.
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