Hard drive density advances face diminishing returns — 30TB+ drives gain just 6.6% capacity with SMR: Report
Blocks & Files studies SMR and PMR HDDs at high capacities, comparing PMR HDDs to their slightly higher-capacity SMR cousins. However, the trend of improvement drops off sharply once a certain TB threshold is reached, potentially due to recording technology.
Seagate Exos Jason Zimmerman Western Digital Shingled Magnetic Recording Heat Assisted Magnetic Recording Perpendicular Magnetic
Source: tomshardware.com