Hi, In my case (net iso of 22 dec 2009) this was a file marker, i.e.
$ /cdrom/.disk/base_installable rename/remove it (since we want to get files from outside), e.g. $ mv /cdrom/.disk/base_installable /cdrom/.disk/base_installable.false in that case mirror settings will be used to retrieve components (debs) instead of cdrom itself. Hope this help. Regards, Sergei.
