Layout of format-U records

With format-U, each block of external storage is handled as a logical record. There are no record-length or block-length fields.

This image shows a line drawing of a physical block and a logical record, which have the same size.

Related concepts  
Logical records

Related tasks  
Requesting undefined format

Related references  
Layout of format-F records  
Layout of format-V records  
Layout of format-S records