Some notes on RootOnZFS article in wiki

Dag-Erling Smørgrav des at
Tue Dec 22 11:48:11 UTC 2009

"James R. Van Artsdalen" <james-freebsd-current at> writes:
> Ollivier Robert <roberto at> writes:
> > On modern machines, system will boot from the GPT "freebsd-boot"
> > partition w/o having it active
> A correctly-written PC BIOS does not even look at (or for) a partition
> table of any sort when booting.  That's been the case for a
> quarter-century.   A system that does not boot without the active bit
> set is buggy, not new vs. old.

Wrong, wrong, wrong.

Some MBRs look for the active bit, some don't.  It doesn't mean they're
buggy; it's a design decision.  FWIW, ours does.

Some BIOSes *do* read the partition table; there was an issue some years
ago with ThinkPads that froze at boot if you installed FreeBSD on them
because they misidentified the FreeBSD partition as a suspend-to-disk

Dag-Erling Smørgrav - des at

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