From owner-freebsd-questions@FreeBSD.ORG  Tue Jul 31 05:01:32 2007
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From: Joel Hatton <freebsd-questions@auscert.org.au>
To: freebsd-questions@freebsd.org
In-Reply-To: Your message of "Mon, 30 Jul 2007 21:46:44 MST."
	<46AEBEB4.7070208@u.washington.edu> 
Date: Tue, 31 Jul 2007 15:01:29 +1000
Subject: Re: Installation problem 
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On Mon, 30 Jul 2007 21:46:44 -0700, Garrett Cooper wrote:
>
>Rakhesh is correct.
>
>    SATA / PATA drives show up under ad[m]s[n][l], where m is the disk 
>number (zero based), n is the slice, aka partition number in the non-BSD 
>(/Solaris?) world, number (zero based), and l is the respective letter 
>for the partition (it can vary depending on the purpose, a being root, b 
>slice, c all of the disk, [d-j?], other values / relevances.
>    SCSI / SAS is almost exactly the same. The only difference is 'ad' 
>is replace with 'da'.

There is a difference between SATA and PATA in one respect (and I'm sure
I'll be corrected by a developer if my experience is unique). PATA drives
appear to be allocated ad0-3, SATA drives begin above that. So, ad4 can
(and may in this case) be the first and only fixed disk in the system.
This was certainly the case with my last SATA system.

cheers,
joel