From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267839AbUHKAZC (ORCPT ); Tue, 10 Aug 2004 20:25:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267842AbUHKAZB (ORCPT ); Tue, 10 Aug 2004 20:25:01 -0400 Received: from krusty.dt.e-technik.Uni-Dortmund.DE ([129.217.163.1]:60317 "EHLO mail.dt.e-technik.uni-dortmund.de") by vger.kernel.org with ESMTP id S267839AbUHKAYy (ORCPT ); Tue, 10 Aug 2004 20:24:54 -0400 Date: Wed, 11 Aug 2004 02:24:55 +0200 From: Matthias Andree To: Gene Heskett Cc: linux-kernel@vger.kernel.org Subject: Re: PATCH: cdrecord: avoiding scsi device numbering for ide devices Message-ID: <20040811002455.GA7537@merlin.emma.line.org> Mail-Followup-To: Gene Heskett , linux-kernel@vger.kernel.org References: <200408101027.i7AARuZr012065@burner.fokus.fraunhofer.de> <200408101228.27455.gene.heskett@verizon.net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <200408101228.27455.gene.heskett@verizon.net> User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 10 Aug 2004, Gene Heskett wrote: [burnproof decreases CD quality] > How so Joerg? Making a blanket statement such as this requires a good > proof example IMO. You not are giving one. The switch from read mode to write mode (i. e. find end of data, increase LASER power to write and pick up writing) takes some time (order of magnitude: µs) which means some pits/lands aren't right during that phase. How many pits/lands are broken break depends on hard- and firmware, write speed and model and for CAV the radial position on the disc. Fast writers will need to reach a linear velocity around 60 m/s (216 km/h); one µs time to ramp up LASER power from read to write level there means up to 60 µm lost. How far good improvements in the hard- and firmware have allowed to reduce that gap is beyond my current knowledge. Some figures are posted at: http://www.digital-sanyo.com/BURN-Proof/tips/No1.html http://www.digital-sanyo.com/BURN-Proof/tips/No2.html -- Matthias Andree NOTE YOU WILL NOT RECEIVE MY MAIL IF YOU'RE USING SPF! Encrypted mail welcome: my GnuPG key ID is 0x052E7D95 (PGP/MIME preferred)