Possible Duplicate:
what is the difference between the usb booting mechanism and optical disk booting mechanism?
I have an iso file. I burned it to a DVD now I can boot using that DVD but when I burned that iso image to a usb it not booting at all from the usb.
Why same image is bootable from DVD and not from USB, what I need to do to make it bootable-usb of the same iso image?
It depends on what you're trying to boot. If you're trying to boot something that's Linux, UNetBootin is great. For Windows 7, give the official Windows 7 USB/DVD download tool a whirl.
As the question sawdust linked explains, you will need some kind of boot loader for images 'burned' to a USB drive. Both these utilities will take care of that. (Anyone know of a solution for pre-Vista installs?)
