| Offsets | Name | Length | Format | Description | |
|---|---|---|---|---|---|
| 0 | 0 | S42CSNXT | 4 | binary | Offset to next SSID header (0 if last SSID). |
| 4 | 4 | S42CSID | 2 | binary | SSID. |
| 6 | 6 | S42CSIDP | 1 | binary | Controller session ID. |
| 7 | 7 | * | 1 | Reserved. | |
| 8 | 8 | S42CSMSF | 4 | binary | Maximum track threshold reached in storage control buffers. |
| 12 | C | S42CSVLO | 4 | binary | Offset to first volume section for this SSID. |
| 16 | 10 | S42CSVLN | 2 | binary | Number of volume sections. |
| 18 | 12 | S42CSVLL | 2 | binary | Length of each volume section. |
| 20 | 14 | * | 4 | Reserved. | |