Data storage essentially means that files and documents are recorded digitally and saved in a storage system for future use. Storage systems may rely on electromagnetic, optical, or other media to preserve and restore the data if needed.

The infrastructure of access to data storage devices is responsible for information availability for applications and final users that is why this component of data storage systems shows the most dynamic development. Instead of conventional direct connection of disc arrays to servers (DAS – Direct Attached Storage) technologies appeared and are now widely used based on the use of networks as infrastructure to access the data.