usage: fdisk [-ieu] [-f mbrboot] [-c cyl -h head -s sect] [-S size] [-r] [-a style] disk
        -i: initialize disk with new MBR
        -u: update MBR code, preserve partition table
        -e: edit MBRs on disk interactively
        -f: specify non-standard MBR template
        -chs: specify disk geometry
        -S: specify disk size
        -r: read partition specs from stdin (implies -i)
        -a: auto-partition with the given style
        -d: dump partition table
        -y: don't ask any questions
        -t: test if disk is partitioned
`disk' is of the form /dev/rdisk0.
auto-partition styles:
  boothfs     8Mb boot plus HFS+ root partition (default)
  bootufs     8Mb boot plus UFS root partition
  hfs         Entire disk as one HFS+ partition
  ufs         Entire disk as one UFS partition
  dos         Entire disk as one DOS partition
  raid        Entire disk as one 0xAC partition