COUNT: Obtain a Count of Unallocated DSCBs or VIRs

COUNT=YES: Indicates that a count of unallocated DSCBs or VIRs in the designated space map is requested. MAP=VTOC or MAP=INDEX must be specified if COUNT=YES is coded.
COUNT=NO: Indicates that a count of unallocated DSCBs or VIRs is not desired but, rather, information on free space on the pack is desired. MAP=VOLUME must be coded if COUNT=NO is coded or the default.