Analysis of big data tools

Nowadays, data is being collected from different sources in a bulk which even sometimes don't receives significant attention sometimes. The data being collected from various sources such as mobile devices, sensory devices, and other technological services. Apart from all this the data is accumulated from varied sources makes the task of big data analytics even more complicated. The data stored is difficult to even store and is very costly and even after we store it, this does not provides new insights. When we are able to process the data sometimes it does not contributes new pathways so after it is deleted. So the challenge faced by big data is the storage medium and the capability to analyses those data. So, is the stored data always useful