|This is not a question, but an answer to the many many questions about this I get.|
Most USB boot problems come from two things:
1) Files were for Floppy/CD and contain bad drive letters. Example config.sys has DEVICE=A:\HIMEM.EXE. To fix, delete A: and leave DEVICE=\HIMEM.EXE.
2) Bad boot sector. The USB must have a boot sector, so copying files to it is not enough and regular format/image tools simply do it incorrectly and give it jacked up boot sectors. The HP USB Disk Storage Format Tool is the only thing I've come across that works on every USB every time (not just HP stuff, everything, even my canon camera). http://h18007.www1.hp.com/support/files/hpcpqdt/us/download/20306.html
The best thing to do is to put the files you want into a folder (extract them from the floppy image if it's an image and not onto the USB as you are about to format it). Run the HP USB thing and make sure you check the make it a boot disk box and point it to your files. When its done copy the files to the USB drive (the HP tool will have copied a few for you, don't overwrite them) and you have a bonafide bootable USB with correct boot sectors and no drive letters in your config/autoexec because you remembered to remove them, didn't you? Yes you did; good boy (or girl).
How cool will you look when you use your iDuck to boot up your friend's laptop? Not cool at all. You'll look like a huge dork with a glowing duck, but you can use that duck to steal his passwords so screw him for judging you!
Disclaimer: I do not now nor have I ever owned an iDuck. Any use of bootable devices be they USB, floppy or otherwise to steal passwords is bad unless it is your computer and forgot or your ex changed your password on you or something similar to that.
Master of the bootable USB crap