GRUB启动盘的制作问题

peacehotel

[root@RedHat9 root]# ll /mnt/floppy
总用量 12
drwx------    2 root     root        12288  1月  3 20:07 lost+found
[root@RedHat9 root]# grub-install --root-directory=/mnt/floppy
install_device not specified.
Usage: grub-install [OPTION] install_device
Install GRUB on your drive.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  --root-directory=DIR    install GRUB images under the directory DIR
                          instead of the root directory
  --grub-shell=FILE       use FILE as the grub shell
  --force-lba             force GRUB to use LBA mode even for a buggy
                          BIOS
  --recheck               probe a device map even if it already exists

INSTALL_DEVICE can be a GRUB device name or a system device filename.

Report bugs to <bug-grub@gnu.org>;.
[root@RedHat9 root]# ll /mnt/floppy
总用量 12
drwx------    2 root     root        12288  1月  3 20:07 lost+found
[root@RedHat9 root]#

各位看看我的操作步骤...没错吧?
怎么就是没能成功的把grub的内容复制进盘里呢?
还是我少了些什么?