> As someone else pointed out, the in-core disk label is 'thrown away'
> when the deveice is no longer in use - in this case as soom as
> mbrlabel exits!

Unless a DIOCKLABEL has been done on that disk.  Which mbrlabel
arguably should do, at least optionally, because of exactly this.
(Note: works for sd and wd in 1.4T; in -current, at most sd, wd, ed,
and something atari-specific.  But no others as far as I can tell.
Test before depending on it.)

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