"Seagate has tried its hardest to shrink the read/write heads of hard drives even further, but with the latest 1 TB 3.5-inch platters, the company believes they've hit a physical brick wall: the head simply can't get any smaller. The same goes for the tracks on the platters, which Seagate claims are as close together as physically possible.
Essentially this means that without increasing the amount of platters in a drive, producing drives with capacities above 4 TB (four 1 TB platters) has become rather hard. To get around these physical limits, Seagate has looked into changing the architecture implemented, coming up with Shingled Magnetic Recording (SMR)."
Link to the Article: TechSpot: Seagate's Shingled Magnetic Recording to bring 5 TB HDDs in 2014
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