DFSORT support for EAS-eligible data set types on Extended Address Volumes has been enhanced to increase the maximum size of a DFSORT work data set. With full track blocking, the maximum number of tracks that can be used for a single work data set has been increased from 1048576 to 16777215. In situations where DFSORT must use a reduced block size for the work data sets, less than 16777215 tracks can be used.