Frank Knobbe wrote:
> I would assume that there are tiny
> indentations that remain from a previous burn of a given dimple that
> might be observable through electron microscopy. Is anyone aware of such
> research?
CD-RW uses a temperature sensitive layer that either crystallizes or
does not crystallize depending on which temperature the "write beam"
was at for that bit. What I am unclear on is if the CD-RW media
is uniformly distributed in the "plastic sandwich" that makes the disc,
or not. I *assume* that it is, purely from a manufacturing
standpoint. If that is the case, then it might be possible that
two different CD-RW drives erase different portions of the bit on the
disc, resulting in a condition similar to what happens on magnetic
media. I would suspect that the same drive would write in the same
place, but I could be very wrong there.
--
Erik Fichtner; Unix Ronin
"Mathematics is something best shared between consenting adults
in the privacy of their own office" - Adam O'Donnell
> I would assume that there are tiny
> indentations that remain from a previous burn of a given dimple that
> might be observable through electron microscopy. Is anyone aware of such
> research?
CD-RW uses a temperature sensitive layer that either crystallizes or
does not crystallize depending on which temperature the "write beam"
was at for that bit. What I am unclear on is if the CD-RW media
is uniformly distributed in the "plastic sandwich" that makes the disc,
or not. I *assume* that it is, purely from a manufacturing
standpoint. If that is the case, then it might be possible that
two different CD-RW drives erase different portions of the bit on the
disc, resulting in a condition similar to what happens on magnetic
media. I would suspect that the same drive would write in the same
place, but I could be very wrong there.
--
Erik Fichtner; Unix Ronin
"Mathematics is something best shared between consenting adults
in the privacy of their own office" - Adam O'Donnell
[ reply ]