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A Hard Real-Time System (also known as an Immediate Real-Time System) is hardware or software that must operate within the confines of a stringent deadline. The application may be considered to have failed if it does not complete its function within the allotted time span. Examples of hard real-time systems include components of pacemakers, anti-lock brakes and aircraft control systems.

Source: https://whatis.techtarget.com/definition/hard-real-time-system-immediate-real-time-system