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From: "Carl J" <carlj1752@hotmail.com>
To: freebsd-questions@freebsd.org
Date: Thu, 10 Mar 2005 16:32:30 -0500
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Subject: Location of disklabel
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Hi all! To all your FS guru's outthere, I desperately need
to know where the disklabel is stored (since my disk is in trouble!)

Situation:

   My /dev/ad0s1 has 2 partitions: "a" (FS) followed by "b" (swap).
   By using "disklabel -r", I see my "a" and "b" indeed
   take up the entire slice.

My desperate question:

   Where, then, is the "disklabel" stored?

   Somewhere in the partition table? The Master Boot Record?
   The reserved cylinder #0?

   Or is it stored somewhere inside /dev/ad0s1a ??
   (if that's the case, does that mean the UFS1
   intentionally left some space unused, for this purpose?
   And if so, is it always at a fixed location within a UFS1 slice?)

   What if in my slice, I have SWAP first, and then UFS1,
   then does that mean the SWAP Format also reserves
   some unused space for the disklabel to go???

Sorry if the question is stupid. I just somehow couldn't
logically see where it would be stored, and yet be compatible
with having other OS on the same drive... etc.

Thanks!

- Carl