2007: Offline ScanState to USB Drive

[saca]

Hi all

I'm migrating a number of computers at remote sites from XP 32 to 7 64. The upgrade will be done by sending around a USB drive which will have a task sequence on it to upgrade them.

As we are using SCCM 2007, I'm largely following this guide: http://www.windows-noob.com/forums/index.php?/topic/1735-using-offline-mode-in-windows-pe-using-usmt-4-via-a-task-sequence-in-sccm-2007-sp2/

My problem is that at some of the sites, the 80GB hard drives are split 40GB/40GB between C: and D: and I rather than run the risk of maxing this out mid-process, or leaving the disk near full capacity once reimaged, I'd like to use the "Partition Disk 0" Task Sequence step and get the full 80GB back. Obviously with the c: being formatted, I am unable to store my user state data there,

So, my plan is to use the USB with the task sequence on it, with enough free space for the USMT to migrate the data to, as well as a few other files and registry keys.

I'm not sure how to do this and my google-fu is failing me here. I'm thinking along the lines of the following...

1. Do inserted flash drives automatically get mounted as D:? (I'd imagine not as you need to set %systemdrive% manually)
   
2. I understand x: is the WinPE location - If the task sequence is on USB does this mean x: = usb?
   
3. Can I somehow mount the USB drive using a task sequence?
   

If anyone has any experience with this I'd be rather grateful!

Thanks