netbootcd + ubuntu 
{{{
DEFAULT menu.c32
        PROMPT 0

        TIMEOUT 100
        ONTIMEOUT hd

        LABEL hd
        MENU LABEL Boot from hard disk
        localboot 0x80

        LABEL hd1
        MENU LABEL Bootup Second Hard disk ( USB )
        KERNEL chain.c32
        APPEND hd1 0

        label live
        menu label ^Run Ubuntu
        kernel /casper/vmlinuz
        append  file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --
}}}