On Thu, 7 Jun 2001 00:56:27 +0100 (BST), md-l-digest wrote:
Overlap of the track is not necessarily bad. By varying the placement
angle of the heads on the drum (azimuth?) we can effect an alternating
polarization of the tracks as they are written to the tape. This allows
the tracks to be written such that they overlap slightly, which allows
for increased track density.
Michael
>| That said what we need concern ourselves with is the linear speed of the
>| head movement cross the tape, not the running speed of the tape past the
>| head drum which is a secondary issue. [...]
>
>Sort of.
>
>Say, for example, a helical scan mechanism that writes 1cm wide tracks on
>the tape, and it takes 1 second for the head to make one full rotation.
>The linear mechanism must move the tape 1cm every full rotation of the
>head, or 1cm/s. If you increase the rotational speed to 2 rotations per
>second but do not change anything else, you can get overlapping tracks,
>which is bad.
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