I/O System Management:
One of the purposes of an operating system is to hit peculierities of specific are the devices from the user. For example, in the unit the peculierities of I/O devices are hitten from the bulk of the operating system itself by the I/O sub system. The I/O sub system consist of,
* A memory management component that includes buffering, catching and spooling.
* A general device interface.
* Drivers for specific hardware devices.
