Virtual PC file size problem?

[Coffee]

Not being using VPC for long now and it's been working fine so far. I've come across a bit of a problem using a 'Dynamic Disk' with it's file size being much larger than it should be. The disk properties when in the guest PC reports as about 2.5g but on the host says 4.3g. It suggests using a disk utility to zero out the useless/deleted data, although none seems to be included with VPC ?¿

When using a 'Dynamic Virtual Hard Disk', as you write data to the disk the size naturally increases. However when you delete files from a virtual hard disk, the data associated with these files is usually not removed. Instead, it is 'marked for deletion' and is still available for use by the operating system. data is not actually deleted until it is overwritten. You must run a disk utility program to 'zero out' the deleted data before using the compact option in the 'Virtual Disk Wizard'.

It's hard to find any 3rd party apps to use for this and most of them take a long time, so i've put together a little script that makes use of a util thats built in to XP.

Don't worry, it's not a virus!

Coffee.