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Date: Wed, 22 Feb 2012 13:27:24 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Omer Faruk SEN <omerfsen@gmail.com>
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Cc: freebsd-stable@freebsd.org, FreeBSD <freebsd-questions@freebsd.org>
Subject: Re: 8.3-BETA1 installation problem
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On Wed, 22 Feb 2012, Omer Faruk SEN wrote:

> I am trying to install FreeBSD 8.3-BETA1 to a system with ssd disk
> recognized as ad6. At fixit mode i can dd device but at installer
> (sysinstall) when I configured disk and using "w" installer is unable to
> format devices stating that
>
> "Unable to find device node for /dev/ad6s1b in dev. The creation of file
> systems will be aborted"
>
> any suggestion on what may be the reason for that or is it a bug on
> installer

Using "W"rite is one of the causes for that.  Don't Write, just choose 
Quit after making selections.

(There are other causes, like old partitioning information on the disk. 
Removing that with gpart destroy or just dd-ing zeros over it is the 
cure in that case.)