┌─────────────────────────────────────┐
          │  Master Startup Record...Note 1.... │
          │....................┌──┬──┬──┬──┬────┤
          │...........Note 2  │2 │6 │0 │0 │55AA│  Note 3
          ├────────────────────┴──┴──┴──┴──┴────┤
          │   Other Operating System Partition  │
          │          (XENIX)                    │
          │     Size  32MB  Note 4             │
          ├─────────────────────────────────────┤
          │ Primary DOS Partition Note 5        │
          │    DOS C: drive  32MB  Size        │
          ├─────────────────────────────────────┤
          │             Free Space              │
          │  (not allocated to any partition)   │
          └─────────────────────────────────────┘

Note 1

Master Startup (Boot) Record code, starting at Track 000, Head 00, Sector 01 of disk 80h or 81h.
Note 2
Partition table for Master Startup (Boot) Record. The 2 is the System ID byte in the partition table that indicates a XENIX partition, and the 06h map indicates a primary DOS Type 6 partition.
Note 3
55AAH is the signature to validate the Master Startup (Boot) Record.
Note 4
Other operating system (XENIX) on disk.
Note 5
Primary DOS partition. C: is block device 80h. The partition type in this example is a 6, because it ends beyond the first 32MB of the disk. Within the scope of this definition, though the size of a primary DOS partition can be less than 32MB (because it ends beyond the first 32MB of the disk), it is defined as a Type 6.

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