>ppps: a tip if you want to change the Apple partition map without destroying
>partitions (OF3 only): get the cd30.fs image from OpenBSD, burn it to CD,
>boot it, choose shell, run pdisk, and change what you want. If you create a
>new Apple_HFS partition and reboot into MacOS 9 it will initialise the
>partition for you. Sadly, you can't resize existing partitions.

Actually it is much simpler.  Somebody created a version of pdisk that runs in the Mac OS.  It was on the MkLinux site I think.