A number of the fields that describe mountable file systems are defined in the macro BPXYMNTE.
| Offsets | Name | Length | Format | Description | |
|---|---|---|---|---|---|
| File System Mount — Data Section: | |||||
| 0 | 0 | SMF92MTM | 8 | binary | Time of mount, STCK format. |
| 8 | 8 | SMF92MPF | 4 | binary | Offset of path section. |
| 12 | C | SMF92MFT | 4 | binary | File system type from MntEntFSType field of BPXYMNTE. |
| 16 | 10 | SMF92MFM | 4 | binary | File system mode from MntEntFSMode field of BPXYMNTE. |
| 20 | 14 | SMF92MDN | 4 | binary | File system device number from MntEntFSDev field of BPXYMNTE. |
| 24 | 18 | SMF92MDD | 8 | EBCDIC | DDNAME specified on mount from MntEntFSDDName field of BPXYMNTE. |
| 32 | 20 | SMF92MTN | 8 | EBCDIC | File system type name from MntEntFSTName field of BPXYMNTE. |
| 40 | 28 | SMF92MFN | 44 | EBCDIC | File system name from MntEntFSName field of BPXYMNTE. |
| 84 | 54 | SMF92MBL | 4 | binary | File system block size. |
| 88 | 58 | SMF92MST | 8 | binary | Total space in file system in block size units. |
| 96 | 60 | SMF92MSU | 8 | binary | Allocated space in file system in block size units. |
| 104 | 68 | SMF92MFG | 1 | binary | Flag byte
|
| 105 | 69 | SMF92MF2 | 1 | binary | Second flag byte
|
| Path Section: | |||||
| 0 | 0 | SMF92PPL | 2 | binary | Length of pathname for directory. |
| 2 | 2 | SMF92PPN | variable | EBCDIC | Pathname of directory where file system is mounted. |