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From: Julian Elischer <julian@freebsd.org>
Subject: a little secret info on AZURE VMs..
Message-ID: <a96b5d55-2a5b-1172-3078-e1a08f40db99@freebsd.org>
Date: Mon, 10 Sep 2018 09:28:46 -0700
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Apparently if you publish an Azure image to their marketplace, they
blindly store billing information at location 65536 of the VHD file..
so you need to ensure that your first partitions start after that.
if you use a layout with your first partition starting at 64 sectors
in, this location falls in the middle of your boot code.
So it fails to boot.

I haven't found any documentation of this yet..


Julian