┌─────────────────────────────────────┐
          │  Master Startup Record...Note 1.... │
          │....................┌──┬──┬──┬──┬────┤
          │...........Note 2  │6 │0 │0 │0 │55AA│  Note 3
          ├────────────────────┴──┴──┴──┴──┴────┤
          │ Primary DOS Partition Note 4        │
          │    DOS C: drive  Size  32MB        │
          └─────────────────────────────────────┘

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 Boot Record. The 6 is the System ID byte in the partition table that indicates a DOS partition where SIZE > 32MB.
Note 3
55AAh is the signature to validate the Master Startup (Boot) Record.
Note 4
Primary DOS area. Owns the entire media and exceeds 32MB in size. C: is block device 80h.

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