Not sure if this helps but I used to use the ImageW to capture/deploy images. I use a 100MB System Partition as the 1st Partition on the drive, and then the 2nd Partition is my Windows Partition. I did this just in case we ever enable BitLocker. So, in order for my Capture script to work I had to select from the GUI ('Image type and path' screen), "Specify which partition is the System or C: Drive" = 2. I saved the OSD script after filling in all the other required information in the GUI. This is what my Capture script looks like after the [MACHINES] section.
