First Edited Format

The first edited format is a comprehensive listing of the DSCBs in the VTOC. It provides the status and attributes of the volume, and describes in depth the data sets residing on the volume. This listing includes:

Logical record length and block size
Initial and secondary allocations
Upper and lower limits of extents
Alternate track information
Available space information, including totals of unallocated cylinders, unallocated tracks, and unallocated (Format 0) DSCBs
Option codes (printed as two hexadecimal digits)
Record formats
SMS indicators

The first DSCB on your listing is always a VTOC (Format 4) DSCB. It defines the scope of the VTOC itself; that is, it contains information about the VTOC and the volume rather than the data sets referenced by the VTOC.