A generic term describing any operating system that is loaded from disk devices when the system is started or rebooted.
— Computer Science(Disk Operating System; pr. ‘doss’) Usually refers to MS-DOS, which was the standard operating system for PCs until- Windows 95- came out, now pretty much obsolete. Controlled by typing in text commands and has several serious limitations, but requires a much less powerful computer than Windows 95.
— Computer Science(Denial of Service)- A form of attack on (usually) an internet service, which aims to prevent the service from operating properly, often by bombarding it with more information than it can process. See also- Mailbomb.
— Computer Science