Then you can't because the installation program expects things to be on the same disk.
However, there may be exceptions. For example with Mandriva, the same distribution can be on either 1 DVD, or 4 CDs. Hence there's probably a config file somewhere that says the installation program what files are on which media. If your OS is such, then maybe it would work.
In this case, you'd have to loop-mount the ISO (or mount the DVD media), create two directories, copy all files to one directory or the other, and then change the above-mentioned config file or equivalent.
Yves.
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