How to copy USB flash drive

I have a USB flash drive from a friend that contains Knoppix linux on it. It seems to have 2 partitions.
The first one is around 35M in size and I cannot browse it. The other is around 163M in size and it has
Knoppix dir and a few other files. I cannot find a tool or command that will allow me to copy the USB
partition directly to another USB flashdrive. I have tried dd command but un-successfull doing that. My
questions is, is there any easy way to create an image of both partitions or of the usb drive in whole?
And then to copy it to another flash drive. What are my options? Thanks in advance.

that depends on what filesystems there are, and DD should work fine in 99% of cases aslong as the two devises are same size and preferably same numbre of "sectors, cylinders...(yeah i know not exactly hw they work, but ...)