OS/390® V2R5 (or later) SMP/E compacts the SYSMOD (PTF) data within the SMPPTS data set to reduce its size. This ability to compact PTF data prior to release by IBM® also allows IBM to shrink the size of the OS/390 service stream, thus reducing the amount of physical media (tapes) required to distribute service, as well as shrink the size of service distributed through various electronic mediums.