State and explain the evolution criteria of a storage device? 

Subject Introduction to Computer System
NU Year Set: 4.(b) Marks: 5 Year: 2012

Storage systems are built by taking the raw storage capability of a storage device such as the HDD and by adding layers of hardware and software in order to obtain a system that is highly reliable, has high performance, and is easily manageable. Storage systems are sometimes referred to as storage subsystems or storage devices (although device is better used to describe the raw storage component or an elementary storage system). Originally, the storage system was just the HDD, but over time storage systems have developed to include advanced technologies that add considerable value to the HDD. Storage systems have evolved to support a variety of added services, as well as connectivity and interface alternatives. It is for this reason that file systems and storage management systems are often considered parts of a storage system and thus will be briefly treated in this paper.

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