| Subject | English | Japanese |
| comp. | n disk operating system | ディスク・オペレーティング・システム |
| comp. | n disk operating system | ディスクオペレーティングシステム |
| comp., MS | Microsoft Disk Operating System | Microsoft ディスク オペレーティング システム (A Microsoft computer operating system with a command-line interface that is used to control many internal computer functions, such as running programs and organizing and maintaining files) |