Hi all,

 There is an argument between me and my friend about the CD writing process.
What I know is the data is written on the Aluminum layer inside the CD but
not the bottom polycarbonate. I have searched information for that to
confirm my point of view. However, my friend uses an AFM to scan the surface
of the bottom CD surface. He can find some tracks pattern on it. So, he is
pretty sure the data is written on the polycarbonate. But, I still can't
believe it. Can someone figure out what's the point we overlook in this
issue? We are using CDR for testing. Before and after pattern writting using
computer, we compared the surface profile.

Thanks.
Hoyin