Under [Data] include:
AutoPartition=0
And under [Unattended] include:
Repartition=No
To ensure full control of selecting hard drives/partitions and formatting options, you must delete the existing file system (should be the following keypresses: D, Enter, then L), and then you can create a new one. Your other partitions and hard drives (if any) shouldn't be affected.
If you don't then Setup will continue to install Windows, on whatever filesystem it currently was.