Cannot access packages in CD

["Jianan Huang" <huangjianan1@hotmail.com>]

Initially I intended to do a network installation. So I downloaded the 
necessary files to disk and launched the installation from there. I had a 
minimal system running and wanted to built up the system through the net 
using apt-get. On second thought, I decided to have a CD copy in case of 
disk crash. So I downloaded a binary-1 image and burned a CD with it. The CD 
shows one 500+ MB file with a .iso extension.

With this CD on hand, I decided to built up the system further through it. 
The trouble is, when I used apt-setup to select the CDROM, the error message 
is:

"Bad CD. Your CD dirve was detected, but it does not seem to have a Debian 
CD."

Why isn't it a Debian CD? Have I downloaded the image with the wrong format?

Please help.

Thanks.

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