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Mike Rivers wrote: ". So you could cut a crazy groove with a laser and play
it back with a laser (every hear of a CD?),"

Uhhh, CDs don't have grooves, they have
pits and lands. No need to worry about
'throwing' a laser read-head with those!

Thanks for the clarification on excursions
though. So it is not the total width of
excursion, it's the velocity(change in
direction) within said excursion.