Don't use sysinstall once the OS is installed.
Instead install sysutils/sfdisk. Then run it like % sfdisk /dev/ad4
Or, use fdisk directly % fdisk /dev/ad4
Trying to do it via sysinstall will only cause problems, aggravations, and insanity.
Oh, and you'll need to set the kern.geom.debugflags sysctl to 16 first.
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