.-MINTRAcksunused(1)-----------.   
>>-+------------------------------+----------------------------><
   '-+-MINTRAcksunused-+--(--n--)-'   
     '-MINTRKS---------'              

MINTRACKSUNUSED specifies that the release operation is to be performed only if the number of unused tracks for a selected data set is equal to or greater than n (n is a 1-to-8-digit decimal number with a range from 0 to 99999999). When you do not specify MINTRKS, DFSMSdss uses a default value of 1. All unused tracks will be released if you perform a release operation.