We present an analysis of the extendability of traditional perpendicular recording based on micromagnetic recording simulation and channel cost/performance analysis. The analysis indicates that head field gradient is the single most important factor in realizing densities above 1.0 Tb/in . The conclusion of this analysis is that 1.5 Tb/in2 may be possible with this technology, but 2 Tb/in2 will be extremely challenging, perhaps impossible even with powerful channel chips. We also examine the extendibility of servo systems, and conclude that either actuator bandwidth must be increased by a factor of 2 from today's drives or integrated disturbance power spectrum must be decreased by a factor of 2 to reach densities of 2 Tb/in2 and beyond.
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