> 
> What's wrong ? It looks like mbrlabel capable to read extended partitions 
> table but due to some reasons it cannot add it into in-core disklabel.

At a guess it is adding it to the in core disklabel, but the disklabel
is discarded when all the partitions are closed!

You might be able to keep the disklabel from disappearing by doing
something like:

# sleep 9999 </dev/wd1d &

	David

-- 
David Laight: david@l8s.co.uk