noun
single density
Computing term referring to a storage medium or data encoding with a single, lower density of data, as opposed to double or high density.
このフロッピーディスクは単密度でフォーマットされている。
This floppy disk is formatted in single density.
高密度 means high density, a more general term for higher data density, often used in modern contexts.
Compound of 単 (single) and 密度 (density), likely a calque from English 'single density'.