Potato APT confusing lines in sources.list

[Jesper Gertz <JG@TP-AS.DK>]

Hi

I have done a complete new Debian Potato installation from the official 3 CD
set.

When I look in "sources.list" to figure out from where APT sources .deb
packages
it says: 
deb cdrom:[Debian GNU/Linux 2.2 r0 _Potato_ -Official i386 Binary-3
(20000814)]
/ unstable contrib main non-US/contrib nonUS/main
deb cdrom:[Debian GNU/Linux 2.2 r0 _Potato_ -Official i386 Binary-2
(20000814)]
/ unstable contrib main non-US/contrib nonUS/main
deb cdrom:[Debian GNU/Linux 2.2 r0 _Potato_ -Official i386 Binary-1
(20000814)]
/ unstable contrib main non-US/contrib nonUS/main

As far as I can see APT gets .deb packages from a "unstable" path on the
official CDROM's

Does anybody know why ?

Thanks a lot.

Jesper Gertz
jg@tp-as.dk