Hyper-V - copying dynmaic VHD to fixed VHD

We found a problem with the conversion business.  We originally had a physical drive that we imported into a Dynamic VHD - the process shrunk the drive in the process in the sense that unused space in the original physical drive was mapped out of the Dynamic VHD - it 'shrunk' the drive. We then wanted to convert it to a fixed size that was bigger than the conversion to Dynamic had allocated but less than the original physical disk size. However, the conversion wanted to create a fixed disk as big as the original physical disk. So what I want to do is create the Fixed VHD a specific size and then copy the Dynamic to that VHD.  With Ghost I have the option to make the target a different size than the source so it would do what I want. I just wanted to see if there was a way to do it with Windows. Do you know of a way to duplicate the Ghost trick with just Windows?  Or alternatively do you know of a way I can convert the Dynamic to a specific Fixed size in my situation so that it doesn't revert to the original physical size?

Why not just covert in Hyper-V?

http://windowsitpro.com/article/articleid/102582/q-can-you-convert-a-dynamic-virtual-hard-disk-vhd-to-a-fixed-vhd.html

As I wrote earlier, that's what we tried to do and it would only create a fixed VHD that was the same size as the original physical disk. In other words let's say we started with a physical disk that was 200 gig. When it was imported and converted to a Dynamic VHD the Dynamic VHD was 100 gig.  When we then tried to convert it to let's say 150 gig Fixed VHD it wouldn't allow it  - it wanted to create a Fixed VHD that was at minimum 200 gig - the original physical disk size.

how much space does it shows as used when you boot up with a dynamic vhd in the virtual machine ?
You can try a test,
create a fixed vhd, convert it to dynamic and then convert it to fixed disk to see what happens, I suspect its because it has set itself a marker of some sort so it won't reduce to your specified size.
the test can reveal that ; i haven't got a hyper-v box at the moment as i am travelling but I will try to check this asap and will post back.

I'll see about trying the test and wait for you when you get back.

I will give this a try hopefully this weekend if I can schedule some down time.