Did you look at their floorplan? There are huge wedge shaped gaps.
Or lets do math. For the sake of argument, lets say that the diagram in their virtual tour was to scale. We're also going to say that each rack is a standard 19" rack, taking up 22" each. That can be wrong, but it's what I'm using for measurement.
The entire circular structure has an area of 24,052 sq/ft.
A square structure on the same property would be 30,625 sq/ft
The circular structure wastes 6,573 sq/ft.
Each pod, with a 3' buffer on each end, and a 3' buffer between rows would have a footprint of 768.4 sq/ft. Since I only included one aisle buffer on each (since they share common aisle), add one more aisle at 102 sq/ft.
The total datacenter rack space is really 3,944 sq/ft.
In the difference between the round and square structure, you could put all the racks and aisles. and still have 26,681 sq/ft.
Or about the size of two Olympic size swimming pools.
Or 0.017 LoC.
Or 53,362 bread boxes one layer deep.
Or you could tile the floor of the wasted space with approximately 106,724 AOL CDs, which coincidentally is about half of the total number of AOL CDs received in Centennial, Colorado in one bulk mailing. Unfortunately, it will be very ugly, because you're trying to tile a square floor with round objects which has lots of wasted space.
I could dazzle you with more numbers, but you've already started cursing me, and I really don't care.