Marketing Fail?
"To reach the same capacity as a 3TB, 3.5-inch... 7K3000 drive, customers would have to purchase three 1TB 2.5-inch 7,200 RPM drives, which will consume up to 170 per cent higher watts to power the drives and will occupy three times the storage array slots“. It says there is a 32 per cent reduction in watts/GB versus Hitachi’s prior generation 2TB A7K2000 drives."
So....get 1x3.5" with 3TB, 3x2.5" 1TBs (which should have no comparison btw, since they use different bays), or simply get 2x3.5"s of the "prior generation" to get 4TB instead of just 3.... Sure, you lose a bit on the power savings and the 6gbps SATA/SAS, but I'm sure those drives just became cheaper....