To use VHDs created by Disk2vhd, you simply need to create a virtual machine and add the VHD to it as an IDE disk. We chose a Vista installation to image a 150GB physical volume required 45GB of disk space for a VHD and took no more time to create than a thorough backup. You simply check the volume to image, create a destination, click Create, and the tool does the rest, displaying a green progress bar as it works. Create, Cancel, and Close buttons are the only controls, except for a Help button and a link to the developer's site. The tool's interface is nothing more than a small dialog listing the target system's disk volumes with checkboxes to select below an entry field for the VHD disk name and directory. This compact tool downloads as a self-extracting compressed file that runs upon opening, so it's portable and has a wide range of potential uses, including a command-line option. The biggest difference between Disk2vhd and other disk virtualization tools is that Disk2vhd works on online systems. It preserves your disk partitions and only copies the data on selected disk volumes, which lets you convert only system volumes while excluding data volumes. Disk2vhd can also create VHDs on local volumes, even those that are being converted. Disk2vhd uses this capability to create accurate "snapshots" of disk volumes selected for conversion. It's built on the Volume Snapshot capability introduced in Windows XP. Microsoft's free Sysinternals Disk2vhd utility creates a Virtual Hard Disk (VHD) image of a physical disk drive for Microsoft Virtual PC and Hyper-V virtual machines.
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