As we know that Hadoop works on commodity hardware, so there is an increased probability of getting crashed. Thus to make the entire Hadoop system highly tolerant, replication factor is preferred even though it creates multiple copies of the same data at different locations. Data on HDFS is stored in at least 3 different locations. Whenever one copy of the data is corrupted and the other copy of the data is not available due to some technical glitches then the data can be accessed from the third location without any data loss.