10-01-2010, 05:37 PM
There are physical limitations involved too. The data density on the discs is such that you can't write to one section without inadvertently affecting the bits next to it. And they can only fit so many platters inside the enclosure and remain within the standard size. I read that they had now found a way around the data density issue but it would be 2-4 years before we see those drives and they would only bump up capacities by about 20% if I remember correctly.