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Date: Thu, 2 Feb 2012 08:22:58 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: "bsalinux@gmail.com" <bsalinux@gmail.com>
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	(wonkity.com [127.0.0.1]); Thu, 02 Feb 2012 08:22:58 -0700 (MST)
Cc: freebsd-questions@freebsd.org
Subject: Re: Fixating boot drive
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On Wed, 1 Feb 2012, bsalinux@gmail.com wrote:

> I'm sure this has been asked before. I'm booting a freebsd system from
> a USB stick. It is currently at da0 but if I add physical SATA drives,
> it moves to da2 and further depending on number of drives.
>
> How can I fix the usb disk to be at da32 or some finite number so that
> even if I add more devices, the boot device would still be at a finite
> location.

Use labels and the device number won't matter:
http://www.wonkity.com/~wblock/docs/html/labels.html