Booting from USB

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My laptop gives me a choice of 3 different USB boot options (besides the
usual ones):
USB Hard Drive,
USB Floppy,
USB Diskette on Key.

However, every time I make a bootable USB thumb drive, it can only boot
as a USB hard drive. It's no big deal, but I wonder what it would take
to get it booted as either one of the other two USB boot options. What
is the difference among the three? Is it due to the drive letter
assignment of the USB drive? It is drive G right now. That's what my
Win7 picked when I created the bootable USB stick.

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