how to boot the host system from the USB disk

[Bai Shuwei]

Hi, All:

    I intall the grub on my usb-disk. I add the configure information
to the memu.list file located in the usb disk. The hard-disk system
can be booted by USB disk. But if i remove the grub installed on the
hardisk, The usb-disk cannot boot the host system. I use the bellow
command to remove the grub
   # dd if=/dev/zero of=/dev/sda bs=446 count=1

 and my menu.list file content is showed bellow

title           Debian GNU/Linux, kernel 2.6.26-2-686
root            (cd)
kernel          /boot/vmlinuz-2.6.26-2-686 root=/dev/hdc ro quiet
initrd          /boot/initrd.img-2.6.26-2-686

title           Debian GNU/Linux, kernel 2.6.26-2-amd64 (single-user mode)
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.26-2-amd64 root=/dev/sda1 ro single
initrd          /boot/initrd.img-2.6.26-2-amd64


   I think my menu.list file is wrong, can somebody can give me idea?
Thanks all!

Best Regards

Bai Shuwei

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