noun
disk operating system; DOS
Computing term for an operating system that manages disk storage; often refers to MS-DOS or similar systems.
昔のパソコンはディスクオペレーティングシステムで動いていた。
Old personal computers ran on a disk operating system.
Variant with interpuncts, sometimes used for clarity.
OS is a broader term for any operating system, while ディスクオペレーティングシステム specifically refers to disk-based systems like DOS.
Loanword from English 'disk operating system', abbreviated as DOS.