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Access time is the time delay or latency between a request to an electronic system and the access being initiated or the requested data being returned.

In computer and software systems, it is the time interval between the point where an instruction control unit initiates a call to retrieve data or a request to store data and the point at which delivery of the data is completed or the storage is started. Note that in distributed software systems or other systems with stochastic processes, access time or latency should be measured at the 99th percentile.^[1]

• Memory latency
• Mechanical latency
• Rotational latency
• Seek time

 This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).

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