During my installation of PI Data Archive 2016, previously I made two partitions "C with 150 GB" and "D with 250 GB". As per this video, there is not option to choice "PIHOME" drive to select and change. Further it gives error like "Insufficient Disk Space in Drive" which terminate my installation instantly.
I gone through full video (above link) and I made partition as per defined in video and my PI Data Archive got installed successfully. May be this cannot be the right solution. May be there should be some OSIsoft's internal drive calculation and allotment system.