barracuda 1tb-per-disk Technology Incorporates 340, 000 Unique Tracks In The Width Of A Single Inch. This Incredible Storage Density Drives New Capacity Possibilities And Lowers Your Total Storage Costs. seagate Acutrac Technology Enables New Storage Densities With Accurate Reading And Writing To Nano-sized Tracks That Are Only 75 Nanometers Wide! That's About 500 Times Smaller Than The Period At The End Of This Sentence.