hadoop not using whole disk for HDFS

[Adaryl "Bob" Wakefield, MBA]

I’ve got the Hortonworks distro running on a three node cluster. For some 
reason the disk available for HDFS is MUCH less than the total disk space. Both 
of my data nodes have 3TB hard drives. Only 100GB of that is being used for 
HDFS. Is it possible that I have a setting wrong somewhere? 
B.