The OpenBSD install script runs the fdisk(8) program for you. If you answer the question, "Do you want to use *all* of <drive> for OpenBSD?" with the default "no", the install script places you in an interactive fdisk console session (# fdisk -e <drive>). If you answer the question with "yes", it will issue an fdisk reinit, rewriting the MBR table, creating a single A6 MBR partition the spans the entire drive.
After the fdisk program (interactive or the entire drive), the install script then places you in an interactive disklabel(8) session to create the BSD partitions.
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