HWT002 How to create a Partitioned Data Set (PDS) using RPF To create a PDS using RPF go to screen 3.1. The deciding parameter on whether to create a sequential file or a PDS is the Directory= field in the lower right of the sceen. This specifies how many blocks to allocate for the PDS directory. If it is zero or left blank the assumption is you want a seqeuntial file not a PDS.