Interestingly, the roadmap shows that a technology called bit pattern media (with the magnetic media broken into small regions on the disk surface) will be introduced about 2021 combined with SMR or an extension to SMR called Two Dimensional Magnetic Recording (TDMR). This will rapidly be combined with HAMR, which will result in up to 10 Terra-bit per square inch (Tbpsi) areal densities by 2025. Note that today’s HDDs have an areal density as high as 0.86 Tbpsi. This implies that a 3.5-inch HDD built with that technology could have about 10 X the capacity of the 10 TB HDDs in 2025, or 100 TB.