How to expand size of VHD virtual disk file

Planning is one of the essential steps when you are building an IT solution. If you underestimate this part of the process lately you will face problems, and sometime those problems are likely with no easy solution or even no solution at all.
One of such problems that may appear is size of hard disks in virtualized environment. Let's say that you are using Microsoft Virtual Server, and initially you defined a Primary hard drive with dynamic size up to 16 GB. You install on this drive OS and after some time you realize that 16 GB is space that do not meet your needs. So adding aditional drive (VHD file) as second may solve your problem. But what you need more space on C: and you are running Windows ?
In such cases I'm using a tool from vmToolkit.com named VhdResizer. This toll for affordable time will expand your VHD disk to size you want (limith is 4TB, but I assume that noone will have a need for such large disk in vitualized environment).

Usage is very easy:

1. You are installing VhdResizer on yor host server.
2. Run the tool and select your VHD file that you want to expand.
3. Name your destination resized VHD file. This is great feature as you don;t have to do backup of your existing drive. After resizing process you will have a new larger file.
4. Define new size and click "resize" button.

About time consumption of this process: I've done it on 16 GB file and expanded it to 30 GB. It took allmost 40 min on HP DL380G5 server with 16 GB RAM and 2 QuadCore Xeon processors.