J. P. Gilliver (John) wrote:
In message , "J. P. Gilliver (John)"
writes:
[]
I wonder if my idea of a spray-on coating - for the labelling side, to
avoid any doubt - has any legs! The chemical could be made _more_
sensitive than lightscribe discs, if it was a two-part process
involving a "fixing" spray to be applied afterwards (either to block
the relevant wavelength, or to stop further change in the chemical, as
in photographic fixers. [Or both.])
[]
I've just had a further thought, though: did LightScribe discs have at
least some tracking info on the label side? I'd always assumed their
only difference to non-LightScribe discs was some extra chemical on the
label side. But I got to wondering how the tracking mechanism was
persuaded to work. If it could be constrained to work in dead-reckoning
mode without feedback - after all, the precision required is at least an
order of magnitude less than that required for the data side - then my
idea could work; if the LightScribe software still needed something to
latch onto, then probably not. (And might explain why "pirate"
LightScribe blanks didn't appear, as well.)

You would probably need an index mark of some sort, to
support multiple passes. And to align one "ring" of pixels
with the next. Perhaps this is the "control zone" in the picture ?

http://www.cdrinfo.com/Sections/Revi...13449&PageId=1

Paul