Fast and simple.
It is not a port of UNIX dd at all! All this program can do is to copy ENTIRE disk to another raw disk. No possiblity to copy part, use image file etc.
The Disk Utility also known as local Disk Management is a basic management tool used to perform disk-related tasks in your PC. The tasks includes, resizing partitions, extending or shrinking system partition, deleting, creating, and formatting partitions, etc. Such tasks are important to change the partition, formatting, etc, of your hard drive, but for that, first it's important to know how to access Disk Utility in Windows 7.
WinDD does not work with GPT partitioned drives.