Update

[Robert J. Hansen]

Regarding the shredded CD-R: I talked to my source and reminded him of
our 2005 conversation.  It became clear that further details are not
available for public release.  In light of this, I have to withdraw my
statement.  I can't back it up; and that means regardless of whether
it's true or false, it has to be withdrawn.

However, my source did point me to the 2006 Defense CyberCrime Center
Forensics Challenge, which involved recovering data off a CD which had
been sliced in two.  While a much weaker challenge than reassembling a
shredded CD-R, it is in the same neighborhood, and it's reasonable to
believe that specialist outfits will have better tools available to them
than the DC3 participants had.