Hitchhiker's Guide to Openbsd

partition must have an id of 'A6'; must *NOT* overlap other partitions; and
must be marked as the only active partition. Inside the fdisk command, the
'manual' command describes all the fdisk commands in detail.
Disk: wd0 geometry: 4998/255/63 [80293248 Sectors]
Offset: 0 Signature: 0x0
Starting Ending LBA Info:
#: id C H S - C H S [ start: size ]
-------------------------------------------------------------------------------
0: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
1: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
3: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
Enter 'help' for information
fdisk: 1>
First of all notice the fdisk prompt. The number "1" indicates the first level of partition tables -- if you were editing an 
extended partition, it would be "2" (or bigger). Extended partitions are partitions which have their own sub-partition 
table, getting around the IBM AT four partition design limit. Extended partitions won't be covered here. 
First, we will make partition "0" a 5G Windows partition (using NTFS), and partition "1" will be our OpenBSD partition 
using the rest of the disk. 
fdisk: 1> e 0
Starting Ending LBA Info:
#: id C H S - C H S [ start: size ]
-------------------------------------------------------------------------------
0: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
Partition id ('0' to disable) [0 - FF]: [0] (? for help)
Since we don't know by memory what the partition ID is for NTFS, we hit "?" here to get a list. 
http://www.openbsd.org/faq/faq4.html (19 of 43)9/4/2011 10:01:58 AM

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4 - OpenBSD 4.9 Installation Guide
Partition id ('0' to disable) [0 - FF]: [0] (? for help) ?
Choose from the following Partition id values:
00 unused 20 Willowsoft 66 NetWare 386 A9 NetBSD
01 DOS FAT-12 24 NEC DOS 67 Novell AB MacOS X boot
02 XENIX / 27 Win Recovery 68 Novell AF MacOS X HFS+
03 XENIX /usr 38 Theos 69 Novell B7 BSDI filesy*
04 DOS FAT-16 39 Plan 9 70 DiskSecure B8 BSDI swap
05 Extended DOS 40 VENIX 286 75 PCIX BF Solaris
06 DOS > 32MB 41 Lin/Minux DR 80 Minix (old) C0 CTOS
07 NTFS 42 LinuxSwap DR 81 Minix (new) C1 DRDOSs FAT12
08 AIX fs 43 Linux DR 82 Linux swap C4 DRDOSs < 32M
09 AIX/Coherent 4D QNX 4.2 Pri 83 Linux files* C6 DRDOSs >=32M
0A OS/2 Bootmgr 4E QNX 4.2 Sec 84 OS/2 hidden C7 HPFS Disbled
0B Win95 FAT-32 4F QNX 4.2 Ter 85 Linux ext. DB CPM/C.DOS/C*
0C Win95 FAT32L 50 DM 86 NT FAT VS DE Dell Maint
0E DOS FAT-16 51 DM 87 NTFS VS E1 SpeedStor
0F Extended LBA 52 CP/M or SysV 8E Linux LVM E3 SpeedStor
10 OPUS 53 DM 93 Amoeba FS E4 SpeedStor
11 OS/2 hidden 54 Ontrack 94 Amoeba BBT EB BeOS/i386
12 Compaq Diag. 55 EZ-Drive 99 Mylex EE EFI GPT
14 OS/2 hidden 56 Golden Bow 9F BSDI EF EFI Sys
16 OS/2 hidden 5C Priam A0 NotebookSave F1 SpeedStor
17 OS/2 hidden 61 SpeedStor A5 FreeBSD F2 DOS 3.3+ Sec
18 AST swap 63 ISC, HURD, * A6 OpenBSD F4 SpeedStor
19 Willowtech 64 NetWare 2.xx A7 NEXTSTEP FF Xenix BBT
1C ThinkPad Rec 65 NetWare 3.xx A8 MacOS X