Boot from Knoppix ISO in HDD using grub

[rajibando]

I used the following code:

menuentry "Knoppix ISO" {
insmod part_msdos
insmod ext3
set root=(hd0,msdos2) #the partition where you've stored knoppix iso
loopback loop /KNOPPIX_V7.0.4DVD-2012-08-20-EN/KNOPPIX_V7.0.4DVD-2012-08-20-EN.iso
linux (loop)/boot/isolinux/linux boot=isolinux iso-scan/filename=/KNOPPIX noeject noprompt --
initrd (loop)/boot/isolinux/minirt.gz
}

everything works, then knoppix iteratively searchs KNOPPIX in /dev/sdax for a few times and lets go.
Where I am going wrong?

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formatted by mod