Boot iso on pen drive by grub installed on pen drive

Hello!!!
I have a pen drive with grub installed.
With it i'm trying to boot the knoppix iso KNOPPIX_V5.1.1.iso wich is on the 4 partition of the pen drive...
Those are the partitions:

Code:

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Dispositivo Boot      Start        End      Blocks  Id  System
/dev/sdc1  *          1          1        8001  83  Linux
/dev/sdc2              2        106      843412+  83  Linux
/dev/sdc3            107        200      755055  83  Linux
/dev/sdc4            201        976    6233220    b  W95 FAT32

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I extract the folder /boot from the iso and i copied it in the same root where is KNOPPIX_V5.1.1.iso the list of file is:

Code:

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boot KNOPPIX_V5.1.1.iso

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I tried to configure grub menu.lst for booting from iso...but when i boot knoppix i always receive the error:

Code:

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Can't find KNOPPIX filesystem, sorry.
Dropping you to a (very limited) shell.
Press reset button to quit.

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The grub's configuration is:

Code:

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title                Knoppix 5.1.1
root                (hd0,3)
kernel                /boot/isolinux/linux ramdisk_size=100000 init=/etc/init lang=it apm=power-off vga=791 nomce quiet fromhd=/hda4/koppix.5.1.1.iso or even fromhd=scan config=scan home=scan ramdisk=32768 noprompt
initrd                /boot/isolinux/minirt.gz
quiet
boot

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I tried a lot of time and i think the error is in the grub's configration where i wrote fromhd=/hda4...because with hda knoppix search on my first hard disk but it must search for the pen drive...
I hope you can help me...
Thank you!!!

Jena,

Give it a try with a slight rewrite to"fromhd=scan" and note the result. I'm actually using a version of the 5.3.1 CD, with the contents ripped from the disc and copied onto a USB stick. Your system should work fine with one or two minor changes to menu.lst.