Boot loader set "back" to mbr?

[Brian Candler]

> I used on the installation the boot loader for
> more then one os. I want to change it so that the
> standart (single freebsd loader) works.

> Is there any chance to do this without doing
> a new installation and delete partitions?

freebsd-questions would probably be the right place for this sort of
question. But the standard mbr is in /boot/mbr, so something like

  boot0cfg -B -b /boot/mbr /dev/ad0

should replace the FreeBSD boot loader with a standard MBR, which won't
prompt you for an operating system.

Brian.