This article concludes the series of publications on specific market sub-segments for personal computers (PC) and peripherals [2,4]. In the previously published works, we have already discussed such sub-segments as the market of personal computers and laptops [2], servers [1], monitors [3], scanners, printers, multifunction devices, and copiers. This material covers a number of sub-segments which represent peripheral hardware necessary to ensure safe operation of the PC, data display and reporting. The combination of these sub-segments in this order is largely reasoned by the fact that during the period under study each of them comprised only a small proportion of the domestic IT market and has not been sufficiently addressed in the scientific literature and periodicals. However, the fact that these sub-segment were actively developing in the period of 2000-2003 and have been underrepresented in the domestic literature made the authors turn to studying them as relevant and currently important. Thus, the sub-segments covered in this paper have their place in the structure of the domestic IT market as its integral elements at the current stage of development.