I want to boot from HD without installing, how can I do that

[windinrain]

I have read the docs about booting from HD for a long time, but all I still do it yet, I don't want to use floppy. there are several methods of booting from HD using GNU/lilo, but in my computer, there have two OS,windows and redhat, and booting from grub. I have tried to amend the grub in the directory /boot/grub/grub.conf, but failed.

[L2Cache]

This page describes several different ways of booting knoppix:
http://www.cclug.org/wiki/Main/KnoppixTricks

[mipooh]

adding to rhe previous answer with the link, where you find the needed files i give you my grub lines, as there it is described using lilo.

title Knoppix CD - knoppix
kernel (hd0,0)/vmlinuz ramdisk_size=100000 init=/etc/init lang=de fromhd=/dev/hdb1 myconf=/dev/hda6 apm=power-off alsa dma screen=1280x1024 hda=scsi hdb=scsi hdc=scsi hdd=scsi vga=791 nomce quiet
initrd (hd0,0)/miniroot.gz

these are 3 lines
title
kernel with appends
initrd
(not sure if it wouldnt look like more lines)