How to solve fd0 or sr0 errors?

If you have this kind of errors:

/init: line 7: can't open /dev /sr0: No medium found
end_request: I/O error, devfd0, sector 0
end_request: I/O error, devfd0, sector 0
Buffer I/O error, dev fd0, logical block 0
end_request: I/O error, devfd0, sector 0
Buffer I/O error, dev fd0, logical block 0

Try disabling the floppy disk (in your BIOS) and put floppy.allowed_drive_mask=0 in syslinux/text.cfg at the end of persistent mode line (before --). Do this in Windows, not in Linux, then try to boot from the USB key.