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Date: Sat, 10 Jan 2004 19:30:05 -0500 (EST)
From: Robert Watson <rwatson@freebsd.org>
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To: Craig Lloyd <sonylloyd@metacrawler.com>
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cc: freebsd-config@freebsd.org
Subject: Re: cd rom device naming clarification 
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On Mon, 5 Jan 2004, Craig Lloyd wrote:

> ->Just an info on something I could found nowhere (searched the device
> namings section of FreeBSD handbook, books, other forums..etc)
> 
> I know that IDE ATAPI cdrom drive is 
> acd -> 
> acd0 = 1st IDE ATAPI cdrom 
> acd1 = 2nd IDE ATAPI cdrom 
> acd2 = 3rd IDE ATAPI cdrom 
> ..etc
> My question: why is there mention in FreeBSD manuals
> and technicals of acd0a, acd0b..etc Why that letter
> at the end (which normaly designates a partition --but 
> there's no partitions on a Cd rom!!!)
> please also tell me when it should be a,b,c,d,e at the end 
> on the cdrom device naming?
> 
> OS that I have -> FreeBSD 5.1

This was a property of our older disk subsystem, and is the case in 4.x
(and maybe 5.0).  In recent 5.x, this is no longer required, and some of
the documentation is probably still out-dated.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Senior Research Scientist, McAfee Research