USB or USB HDD large enough to hold all your files
Boot manager installed to your usb to boot your "tools"
"Tools" (Windows recovery pretty much is my main tool for installing os's, and bootloaders)
An OS enviroment that allows:
VHD mounting and write capable (Optional for those who wish to install into a VHD)
ISO extracter (Optional for those who wish to extract iso contents on the fly to the target partition)
Ability to install bootmanagers to target drive
Extract your iso into its respective empty folder (My case /boot/boot-iso/name_of_iso/ Files_extracted_here )
Boot into your favorite tool (I just use Win 7 x32 or x64 recovery)
Copy the contents of your iso folder to target drive
Run install appropriate boot manager to target drive (Windows: Make sure boot and active flags are set on the target partition)
Make sure your harddrive is set to boot in the bios
Setup will start
(If installing more than 1 OS, just do this as many times as needed, ignore missing boot entrys or boot loaders.
Once your done, install your preferred bootloader and set it up to recognise all your OS's)
If you install Windows Vista, 7, or 8 this way, then you will have an extra boot option in your boot manager from now on. Called "Windows Setup"
This is basically a shortcut that allows you to boot straight into your "iso" Since the files are still on your harddrive windows is able to call the setup directly
A bootable iso could be created that does the above mentioned automagically.
You pick your iso, pick your destination drive, specify which bootloader you want and it does the rest
Edited by Sascha Elble, 01 November 2012 - 02:05 AM.