Hmm, not sure but running it from usb flash drive seems to be the best option as the image will fit only on DL-dvd, and i remember some ppl had problems with that anyway. I`d say it runs better from flash drive, at least on mine hardware.

And what are the advantages ? well, you can use it to test your hardware before making any changes to your drive and previous OS, you can use it to repair stuff if your existing OS messes up, etc. It`s very useful.

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