DSORG specifies the organization of the data set as physical sequential (PS), partitioned (PO), or direct (DA). If the data set is processed using absolute rather than relative addresses, you must mark it as unmovable by adding a U to the DSORG parameter (for example, by coding DSORG=PSU). You must specify the data set organization in the DCB macro. In addition:

• When creating a direct data set, the DSORG in the DCB macro must specify PS or PSU and the DD statement must specify DA or DAU.
• PS is for sequential and extended format DSNTYPE.
• PO is the data set organization for both PDSEs and PDSs. DSNTYPE is used to distinguish between PDSEs and PDSs.