You can create reports that include data set size, volume usage, and capacity. Data set size and volume usage are available in both KB and factored values. If you are using existing KB values, these fields have a maximum value of 9 999 999 999 KB, or approximately, 9 TB. For larger tape volume capacities and improvements in compression, use the fields that contain values that are factored. Initially, these are in MB, but they can also be factored to TB as tape capacity increases. If you are reporting on small data sets (where the data sets size or volume capacity used is so small that you need to see the KB values), do not use the fields that contain values that are factored. If a KB byte field is no longer large enough to contain the value, the value is set to ‘-1’. This indicates that the factored fields should be used instead. When reporting from SMF records, data set size and volume use are recorded in 64 bit fields in KB only.