Werner,

I will write for the third and last time: It does not work under Windows 7.

If you create the Virtualbox rawdisk as I describe on "summary.html", the rawdisk is read- and writeable.
The example you give is for Linux. I'm sure it works for Linux as am I sure it works for Windows XP but I have Windows 7.

Knoppix thinks the device is read/write. So does Virtual Box. However, Windows 7 blocks any attempt to write to the device. It's a security thing. I don't know the details and I don't want to. In simple terms, if you try to write to a raw boot device, Windows 7 thinks you are trying to slip some malware into it's underware and blocks you.

At this point "asks about creating a persistent data image" Knoppix doesn't wait very long; the boot process goes on and it seems as there is no ability to create persistent memory. Reboot and try once more.
My apologises. To clarify ... Knoppix tries and fails to create the persistent data image. It reports errors writing to the device. Once Knoppix has booted, I can mount the second partition on the USB stick. It is mounted read/write as far a Knoppix is concerned but if I try to create a file on the partition, Knoppix reports the partition is read-only.

I rebooted the physical PC from the USB stick and Knoppix was able to create a persistent data image, so the issue is not a dodgy USB stick. I reboot in the virtual PC and Knoppix read the persistent data image OK and I could see the changes I had made. However, when I tried to shut the virtual machine down Knoppix could not write back new changes to the persistent store and hung. I had to kill off the Virtual Machine ungracefully.

Klopt oder ?