Announced at PDC 2008
The Virtual Drive support in Windows 7 has some nice enhancements. There is now built in support for mounting existing VHD’s. You can create a new fixed or dynamic VHD from the drive control panel. My favorite feature? You can mount a VHD at boot time and then boot to the image. Imagine creating a test install of Windows 7 on a VHD. Boot to the test VHD, not your normal desktop and work with system. On the next boot you can continue to work on this VHD or perform a rollback to the original VHD image.