VhdTool or any other tool to create fixed size VHDs faster

Hi Experts,

I tried to convert a dynamic VHD to Fixed size VHD. It is taking very long for Creation/Conversion of VHDs of size 250GB or more.

I tried VhdTool from http://code.msdn.microsoft.com/vhdtool

This tool is creating VHD files very fast.

The above link has been retired now.

Is this tool MS proprietary? Is there any license required for using this Tool?
and can I use this tool in my Hyper-V VM?

Any other tools suggested by Microsoft for Creating/Converting VHDs?

Thanks in advance,

Saleem