关于制作在U盘上CDlinux的问题

leenet

[root@localhost root]# mount -t vfat /dev/sda1 /mnt/usb

[root@localhost root]# syslinux /dev/sda1

mount: /proc/1809/fd/3 already mounted or syslinux.mnt.1809.0 busy  此处是什么意思

[root@localhost root]# mount -o loop /home/free/CDlinux-0.4.9.iso /mnt/cdrom

[root@localhost root]# mount -o loop /mnt/cdrom/boot/CDlinux/CDlinux.img /mnt/floppy

复制"/mnt/floppy/bzimage"时发生错误 "I/O"错误  你要继续吗?

复制/mnt/floppy/CDlinux.gz时也发生同样的错误