Large organisations use terabytes of storage to hold massive amounts of data. People at home probably do not use terabytes, they would use gigabytes, megabytes and occasionally kilobytes. However, in the future terabytes of storage will probably be more common in home usage. In fact, according to this page on the Apple website, 2008 Apple iMac computers can be ordered with 1 TB hard drives. An external hard drive can be several terabytes. Usually, one terabyte of space costs between $100 and $150.