To make an EXACT copy of one disk to another is easy with the command $ DD. This command will do a block by block copy of one source to another, partitions and all.

Here is what you need to do:

1) $ fdisk -l to see your drives

2) $ dd if=/path_to_your_source_drive/ of=/path_to_your_target_drive/ bs=4096k

      if = input file

     of = output file

     bs = block size

                  example: $ dd if=/dev/sdb of=/dev/sdc bs=4096k