Still no good solution to do clean OS install with no CD/DVD drive and floppy

I learned it from the hard way yesterday that there's something serious problem creating a clean new partition with a computer (in my case, a subnotebook) with no CD/DVD drive and no floppy disk drive. Using thumb drive isn't a good solution for the sake of creating new bootable partition because the system will treate the thumb drive as a new harddisk (as C drive). Personally I much rather the system treat the thumb drive as a removal floppy drive or something like that, and not the C Drive.

So as the result, I couldn't cleanly create a new boot partition, but instead created a dual boot setting. There has to be a better way to resolve the problem.