Microsoft Sysinternals Tool Disk2vhd is a utility that creates VHD (Virtual Hard Disk – Microsoft’s Virtual Machine disk format) versions of physical disks for use in Microsoft Virtual PC or Microsoft Hyper-V virtual machines (VMs). The difference between Disk2vhd and other physical-to-virtual tools is that you can run Disk2vhd on a system thats online. Disk2vhd uses Windows‘ Volume Snapshot capability, introduced in Windows XP, to create consistent point-in-time snapshots of the volumes you want to include in a conversion
Command Line Option:
disk2vhd <[drive: [drive:]…]|[*]> <vhdfile>
disk2vhd * c:\vhd\snapshot.vhd