Remove the value stable replace it for wheezy. There is an example at the end of the thread for example
Code
deb http://ftp.au.debian.org/debian wheezy main contrib non-free
deb http://ftp.debian.org/debian/ wheezy-updates main contrib non-free
deb http://security.debian.org/ wheezy/updates main contrib non-free
disconnect data drivers? When?:
The drives you use in your server that have data (photos, documents, etc), so the installer sees only one disk, the OS disk. And installs there not in a data disk. Do you get the idea? is to avoid formatting by accident a disk that contains information.