% dd if=/dev/adN of=mbr_adN bs=512 count=1
changing N accordingly.
But you need a writable location for the output file, so you can use a pendrive you've already mounted or you could simply do this from FreeBSD itself.
So you have not read the man page yet. You should use the -f option with a "configfile". And there is a very detailed "configfile" at the end of the page. Read it!
% dd if=/dev/adN of=mbr_adN bs=512 count=1
changing N accordingly.
But you need a writable location for the output file, so you can use a pendrive you've already mounted or you could simply do this from FreeBSD itself.
That works with a standard MBR, but not a non-conventional one, like GPT, made larger to accommodate ZFS -- see the examples section in the gpart manpage for more details.
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