Those machines the USPS use, heat up the mail, lot of people complain about
the burned odor and scorch marks. And CD/DVD that are burned at home do not
drill tiny holes into the surface with the laser. The laser changes a dye on
the blank disks. Entirely reasonable to think that being cooked would
adversely affect them.
"The laser heats and burns tiny spots on the dye layer. The burned spots
become opaque (i.e., nontransparent) by blocking light from reaching the
aluminum layer. Thus, a burned CD-R has both highly reflective and poorly
reflective spots representing the 1's and 0's, respectively"
Commercial disks have the pits formed in the disk by a molding operation
from a master disk.
BK
"In photography there is a reality so subtle that it becomes more real than
reality."
----- Alfred Stieglitz
J Bryan Krämer North Florida, USA
photos at: http://pbase.com/photoburner
blog at: http://www.photoburner.net
On Wed, Oct 20, 2010 at 21:34, Beutler Frederick <fjb@umich.edu> wrote:
> Thanks for warning me. I'll certainly follow that advice.
>
> At the same time, I can't help wondering what happened to your CD. The
> information is encoded on CDs and DVDs by tiny pits that are read optically.
> Therefore, neither magnetic waves nor X-rays should be able to affect the
> CD.
>
> Fred Beutler
>
> On Oct 20, 2010, at 2:31 PM, James Dunn wrote:
>
> > Do NOT use the US Post Office to mail a
> > CD or DVD to the Library of Congress.
> > All mail addressed to US Gov offices in
> > DC is sent thru a high radiation process
> > to prevent anthrax, etc powders from being
> > mailed in. I made this mistake a few years
> > ago. MY CD was destroyed by the process!
> > It was unreadable. I was notified by the Library
> > to send a replacement- 6 months after the
> > original was mailed (They are VERY slow!!!)
> >
> > If you send a CD or DVD use UPS or FED-X !!!
> > They do not irradiate the package.
> >
> > Notice to terrorist: Please pretend you did
> > not hear this from me.
> >
> > --
> > James Dunn
> > www.ImagesByJamesDunn.com
> >
> >
> >
>
> Frederick Beutler, Ph.D.
> Professor Emeritus
> EECS Department
> University of Michigan
> fjb@umich.edu
> fbeutler@comcast.net
> http://web.me.com/fbeutler
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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