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From: "Kiniger, Karl (GE Healthcare)" <karl.kiniger@med.ge.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Randy.Dunlap" <rddunlap@osdl.org>, sergio@sergiomb.no-ip.org,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Date: Tue, 15 Feb 2005 20:48:13 +0100
Subject: Re: ide-scsi is deprecated for cd burning! Use ide-cd and give	dev=/dev/hdX as device
Message-ID: <20050215194813.GA20922@wszip-kinigka.euro.med.ge.com>
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On Tue, Feb 15, 2005 at 05:02:35PM +0000, Alan Cox wrote:
> On Maw, 2005-02-15 at 02:25, Randy.Dunlap wrote:
> > It means:  don't use the ide-scsi driver.  Support for it is
> > lagging (not well-maintained) because it's really not needed for
> > burning CDs.  Just use the ide-cd driver (module) and
> > specify the CD burner device as /dev/hdX.
> 
> This information is unfortunately *WRONG*. The base 2.6 ide-cd driver is
> vastly inferior to ide-scsi. The ide-scsi layer knows about proper error
> reporting, end of media and other things that ide-cd does not.
> 
> The -ac ide-cd knows some of the stuff that ide-cd needs to and works
> with various drive/disk combinations the base code doesn't but ide-scsi
> still handles CD's better.
> 
> Alan

I can confirm that. Creating a correct  iso image from a CD is a
major pain w/o ide-scsi. Depending on what one has done before the iso
image is missing some data at the end most of the time.
(paired with lots of kernel error messages)

Testing was done here using Joerg Schilling's sdd:

sdd ivsize=`isosize /dev/cdxxx` if=/dev/cdxxx of=/dev/null \
	bs=<several block sizes from 2048 up tried,does not matter>

and most of the time it results in bad iso images....

Gretings
Karl
-- 
Karl Kiniger   mailto:karl.kiniger@med.ge.com
GE Medical Systems Kretztechnik GmbH & Co OHG
Tiefenbach 15       Tel: (++43) 7682-3800-710
A-4871 Zipf Austria Fax: (++43) 7682-3800-47
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