The device area (pattern) attributes are bundled in a DAREABUNDLE structure:

┌───────────────┬─────────────────────────────────────────────┐
│Parameter      │Description                                  │
├───────────────┼─────────────────────────────────────────────┤
│cAttr          │Size of the logical area bundle.             │
├───────────────┼─────────────────────────────────────────────┤
│cDefs          │Size of the AREADEFS structure. This is 0    │
│               │when no device area bundle exists.           │
├───────────────┼─────────────────────────────────────────────┤
│abnd           │AREABUNDLE structure. See text following     │
│               │AREABUNDLE Mask:.                            │
├───────────────┼─────────────────────────────────────────────┤
│adef           │AREADEFS structure. See text following       │
│               │AREABUNDLE Mask:.                            │
└───────────────┴─────────────────────────────────────────────┘