Creating Partitions as part of unattended install

[vortex0007]

I'm trying to get an unattended install of Windows 2000 and Windows XP to do the following:

Create C:\ with 90% of available space on hard drive 1

Create T:\ with 10% of available space on hard drive 1

The limitations are that I need to accomplish this through Sysprep and not WinPE or Bart's PE. Can anyone recommend how this might be accomplished?

I've looked at Diskpart for the XP but I'm not sure if that will work within the context of Sysprep...... and I'm not sure if it works with 2000.

Can anyone help?