Real-time application (RTA) is considered as an application program, that functions within a particular time frame, which the user feels or perceives as current or immediate. The latency, which refers to the consumed time for a specific block of data to rotate around the read or write head upon a data track, should be lesser than a defined value. Generally, the latency is measured through seconds. The qualification of any given application, at a given point of time, as a real-time application is dependent upon the worst-case execution time (WCET), which is the maximum amount of time required of a defined task or set of certain tasks on a specified hardware platform. The usage of the real-time application (RTA) is regarded as real-time computing (RTC).
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