The FreeBSD Boot Manager
You can install the FreeBSD boot manager during the FreeBSD installation to enable booting of multiple operating systems. After the install, you can configure the boot manager with the boot0cfg program.
boot0cfg -B will install the boot manager onto the hard disk’s MBR. This is one way to restore the boot manager if Windows should wipe it out (if, for example, you install Windows after you install FreeBSD). Of course, you would have to boot from a FreeBSD boot disk to use boot0cfg -B if the boot manager has been wiped out. In addition, if you want to make changes to the boot manager configuration, you will need to reinstall it using this command, followed by the changes you want to make.
boot0cfg is command-line based. ...
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