Hi,
As youve no doubt found out by now - the auto partitioning tool (c:partition) fails to prepare the drive, so InstallAROS doesnt have anything to format.
The solution as you've also been told/found out is to manually partition it in HDToolBox for the time being ..
I hope to take a look at c:partition sometime in the near future and fix the problems with it - and also make it use only freespace by default, and have an option to forcefully nuke a drive.
The options are in InstallAROS but not doing anything atm..
yours,
Nick Andrews
aka Kalamatee