System unit consists of a plurality of hardware devices that provide the computer. Some devices are integral, critical to the operation of the PC, and others perform a supporting role, expanding the capabilities of the system. Despite the different purposes, all the components cooperate with each other and the operating system, drivers, thanks to the system devices.
By integrated devices include the motherboard and set it on the electronic circuits (CPU, RAM, ROM, cache memory, controllers connected equipment, graphic cards), hard drive and storage systems, power supply. List of auxiliary equipment which is updated almost every day, because of the emergence of new devices make it easy to work with a PC and perform everyday tasks.
Such equipment may be included:
«legacy» Drives CD-RW, DVD-RW, DVD-ROM, which still benefit many users to;
Internal and external modems;
Sound card;
Adapters;
PCI bridges;
Interface controllers;
Keys and buttons specific functions;
Docking station;
Bus Wireless;
Device virtual machines;
Hubs USB.
This is not a complete list of components, which can be equipped with a PC. For efficient operation of a particular type of equipment you need to download drivers for system devices under the installed version of the OS.