2. Go to your installation of VMware (ie. "C:\Program Files\VMware\VMware Workstation")
3. Type: vmware-vdiskmanager -x sizeGb "filename"
Example
vmware-vdiskmanager -x 20Gb "K:\Virtual Machines\Kubuntu\vmware-vdiskmanager.exe"4. Once you're done with that, use some software within the VM to change the partition size.
Linux generally have their own partition software within the setup CD/DVD, whereas Windows would have Acronis Disk Director or Partition Magic.
Personally I'd install Disk Director, because I've lost data on my actual computer before when using Partition Magic. Plus its now a Symantec product, which brings to mind the expression "the cure is worse than the disease".
Either way, the demo would work fine since its a VM.
[ Source ]
*edit 30/03/2009*
I've noticed alot of people getting to this blog in hopes to find a way to stop VM ware from lagging your computer after you suspend a guest.
Google seems to be returning the wrong results as the menu contains a link to the right post.
You can find that post here.