Reading too much into it?
The upgrade to 45TB may not be done with fifteen 3TB drives -- the key part of the tech they're promoting is the amount of storage they can cram into a 19" rack mount. I wonder how many 1TB 2.5" drives you could fit into the same volume if you were willing to pay the price?
Quick estimate: 15 x 2TB 3.5" drives at 80 quid each = 1200 smackers. 45 x 1TB 2.5" drives at 100 quid each = 4500 quid. Not cost-effective right now in terms of price per gigabyte but as the 2.5" drive prices fall it will become more and more affordable. Of course if there are 1.5TB 2.5" drives around the corner then that would add another possibility to the mix.
