The Head-Disk Interface Roadmap to an Areal Density of 4Tbit/in²

Table 1

Estimated HMS (nm) values as a function of AD and BAR.

	BAR
AD (Tb/in^2)	3.0	3.5	4.0	4.5
2	6.2	5.8	5.4	5.1
4	4.4	4.1	3.8	3.6