"Is it possible to split the installation-files over more
disks, when there is not enough space available on one disk?"
Answer: Yes, of course. Go to section "1 - General settings" and
click on "Medium". Then select "Disks". In the dialog box
"Size" you can specify the number of bytes available on the disks you intend to
use. Please note that the file names also take up additional disk space.
If the available space is not used fully or is not enough on disk number one, you can
specify a special value for the size at disk-1: Menu Installation - Special - Adjust