Puppy on USB - boot says "missing operating system"

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http://www.linuxquestions.org – I have done no mistakes. My BIOS boots from the USB. I downloaded puppy 5.0.1 iso and burned it to a cd. Then booted from the cd and used install to set it up on a usb. It didn't work ... I am a complete newbie ..... please Help me Also please suggest some other distro for a usb (HowTos)