The best way to copy a partition is to use BootIt BM's Partition Work Copy feature or the Copy feature of Image for Windows, Image for DOS, or Image for Linux.
The following instructions are provided as-is. Use at your own risk.
These instructions assume both the source and destination partitions are already in the MBR partition table. It also assumes that the source will be C: and the destination D:
Use the XCOPY command to duplicate the partition:
XCOPY C:\*.* D:\ /e /c /h /r /k
Once copying is complete, use the SYS command from C: by typing: