In the fdisk(8) manpage you will see the following table.
#: id C H S - C H S [ start: size ]
-------------------------------------------------------------------------
0: 04 0 1 1 - 170 0 63 [ 63: 2570462 ] DOS FAT-16
1: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
*3: A6 170 1 1 - 5167 239 63 [ 2570463: 75569697 ] OpenBSD
For a first timer, reading this manpage during installation I think that this
partition scheme would confuse them.
The "start" of #3 should actually be 2570462+63. The size of #0 plus the start
point.
You can see the proper behavior in the following table from FAQ (14.2).
Starting Ending LBA Info:
#: id C H S - C H S [ start: size ]
------------------------------------------------------------------------
*0: A6 3 0 1 - 552 254 63 [ 48195: 8835750 ] OpenBSD
1: 12 0 1 1 - 2 254 63 [ 63: 48132 ] Compaq Diag.
2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
3: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
If I'm blatantly missing something please let me know, but I believe this is a
bug.
Thanks.
.adam.