Differencing Disks in Virtual PC

David Cumps did an interesting post about differencing disks in Virtual PC. A base image (parent) of a virtual pc can be shared with other - unlimited - virtual machines (children). Disk differencing works by storing only the changes (delta) to an original image in a new VPC virtual hard-disk. I will certainly give this a try at home!

Advantages :

• Your base image stays intact
• Saving deltas means a lot less storage space
• Setting up a new virtual machine (based on a base image) is lightning fast

In the comments on his post, David has also a solution for auto-updates by Windows.