| Offsets | Name | Length | Format | Description | |
|---|---|---|---|---|---|
| 0 | 0 | SMF420NA | 120 | Structure | |
| 0 | 0 | SMF42NJBN | 8 | EBCDIC | Job name. |
| 8 | 8 | SMF42NRST | 4 | binary | Reader start time in hundredths of a second. |
| 12 | C | SMF42NRSD | 4 | packed | Reader start date in the form 0cyydddF. |
| 16 | 10 | SMF42NUIF | 8 | EBCDIC | User identification. |
| 24 | 18 | SMF42NUID | 8 | EBCDIC | RACF® user ID. |
| 32 | 20 | SMF42NCGP | 8 | EBCDIC | RACF connect group. |
| 40 | 28 | SMF42NVER | 1 | EBCDIC | Record version identifier (2). |
| 41 | 29 | SMF42NACT | 1 | EBCDIC | Activity type: C - Data set create E - Data set extend U - Data set update R - Data set read access D - Data set delete |
| 42 | 2A | SMF42NSTP | 1 | binary | Security type. |
| 43 | 2B | * | 1 | EBCDIC | Reserved. |
| 44 | 2C | SMF42NDSN | 44 | EBCDIC | Data set name. |
| 88 | 58 | SMF42NVOL | 6 | EBCDIC | Volume serial number. |
| 94 | 5E | SMF42NUNT | 8 | EBCDIC | Device type. |
| 102 | 66 | SMF42NDSQ | 2 | Unsigned | Data set sequence number. |
| 104 | 68 | SMF42NVSQ | 2 | Unsigned | Volume sequence number. |
| 112 | 70 | SMF42NLDTO | 8 | EBCDIC | Local time/date offset. |
| 120 | 78 | SMF42NEND | 0 | EBCDIC | 1st data section end. |