This is a list of all of the types of records that may appear in an unload data set in the groupings and order in which they must appear:

1. Unload File Header
   • COPYR1, the first header record is always present.
   • COPYR2, the second header record is always present.
2. Directory Information
   • Directory Block Records
     • One or more are always present.
     • Each record contains 1 or more partitioned data set directory blocks.
     • The last record also ends with an EOF block of 12 bytes of zeros.
     • For PDSE, a long name directory containing names greater than 8 characters will be included.
   • Data Set Attribute Records
     • These are optional, and can only appear in a PDSE format unload data set.
3. Individual Member Data (This group repeats for each member.)
   • Note List Record
     • Used by the linkage editor and other applications to record relocatable addresses of records inside the member.
   • Member Data Records
     • One or more present.
     • Each record contains 1 or more physical blocks of the original data set.
     • The last record also ends with an EOF block (12 bytes of zeros).
   • Member Attribute Records
     • These are optional, and can only appear in a PDSE format unload data set.

A detailed description of the different records is given in later paragraphs.