Is there a rule where you cannot image a file that's already compressed? I'm trying to organize my files and tried making an image of the file which was in .zip and when I used a daemon tool to test it, it reported errors.

I'm using Nero 6 which seems to be working just fine with other files.

I'm also new to this and can't believe how efficient it can be, but I also noticed imaging a file(s) will increase size.