RTA4BYTE=YES

Specifies that the extents area contains pairs of addresses in the format RTA RTA+1, where RTA is the four byte relative address of the first track of the extent, and RTA+1 is the four byte relative address of the last track of the extent plus 1.

You must use the macro ICVEDT02 to map the extent area if you specify RTA4BYTE=YES. See Table 1 for a description.

RTA4BYTE=YES is a required parameter for an nonindexed VTOC, and optional for an indexed VTOC.

RTA4BYTE=NO

Specifies that the extents area is in the format XXYYZ where:

XX	The relative track address of the first track of the extent
YY	The number of whole cylinders in the extent
Z	The number of additional tracks in the extent.

If you do not specify the RTA4BYTE parameter, the default is RTA4BYTE=NO.