noun
physical recording density
Technical term used in computing and data storage to describe the amount of data that can be stored per unit area or length on a physical medium.
ハードディスクの物理記録密度は年々向上している。
The physical recording density of hard disks is improving year by year.
A broader term for recording density, not necessarily specifying the physical aspect; 物理記録密度 explicitly refers to the physical layer.
Compound of 物理 (physical), 記録 (recording), and 密度 (density).