Today, computer systems become one of the most important systems in technology and our life. They have a plenty of possible applications but most of them can be described as a transformation of (electrical) energy into useful work = calculations. This process is not so simple as it seems to be because the structure of computers hardware is very complicated and processed tasks are also very complex. Because the expectations of computer users are very high, a lot of computer resources are used only for their operating systems normal work. Some existing solutions, especially in the memory system, guarantee that computer systems have acceptable performance but this parameter depends on many important system features. In this study we focus on one parameter, namely Average Disk Time s/ Transfer, in order to show the complex behaviour of hard disk (a part of memory system) during man—computer interaction. This is one of the most important counters in computer systems that work under Windows family Operating Systems and describes measurement related to hard drive based on the complete roundtrip time of any request.

The research was done basing on the analysis of 60 different records of long-term interaction between computer user and computer system. Basing on the properties of spectral analysis for obtained time series it is shown that the existence of long-range dependencies has a major influence on computer system performance leading to the disturbed processing and increasing response time R. Thanks to the Little's law it can be shown that the increasing response time R leads to the performance drop.

Presented research is a try to establish new way of thinking in the case of computer systems which can be seen as examples of complex systems.

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