From owner-freebsd-stable@FreeBSD.ORG Fri Aug 1 02:49:58 2003 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5536837B401 for ; Fri, 1 Aug 2003 02:49:58 -0700 (PDT) Received: from fyserv1.fy.chalmers.se (fyserv1.fy.chalmers.se [129.16.110.66]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1FCC943FD7 for ; Fri, 1 Aug 2003 02:49:57 -0700 (PDT) (envelope-from appro@fy.chalmers.se) Received: from fy.chalmers.se (g2-mac24.fy.chalmers.se [129.16.118.155]) by fyserv1.fy.chalmers.se (8.8.8/8.8.8) with ESMTP id LAA03570; Fri, 1 Aug 2003 11:49:46 +0200 (MEST) Sender: appro@fy.chalmers.se Message-ID: <3F2A37F6.DA046CDA@fy.chalmers.se> Date: Fri, 01 Aug 2003 11:50:46 +0200 From: Andy Polyakov X-Mailer: Mozilla 4.8 [en] (X11; U; Linux 2.4.21-xfs i686) X-Accept-Language: en MIME-Version: 1.0 To: Chuck Swiger References: <3F298DD2.4070001@mac.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit cc: Melvyn Sopacua cc: stable@freebsd.org Subject: Re: [Fwd: dvd+rw-format -force problem] X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Aug 2003 09:49:58 -0000 > -------- Original Message -------- > Subject: dvd+rw-format -force problem > Date: Thu, 31 Jul 2003 21:30:00 +0200 > From: Melvyn Sopacua > Organization: WebTeckies.org > To: stable@freebsd.org > > I haven't felt the need to fully blank a DVD+RW for a while untill today. Formally speaking blanking is not appicable to DVD+RW. dvd+rw-format -force merely zeros bitmap which describes which ECC blocks were de-iced/written to and nullifies few blocks in the beginning of the media. It's not what one would normally consider as [full] blanking. If you want to nullify the media, e.g. for privacy reasons, 'dvd+rw-format -force /dev/cd0c' won't do the tick, 'growisofs -Z /dev/cd0c=/dev/zero' would. > The problem is the following: > When issuing: > dvd+rw-format -force /dev/cd0c > > it fails, with 'unable to unmount' error. I see the problem now. Fortunately I'm preparing new update addressing performance problems with Pioneer DVR-x06 and will incorporate proper solution even for this problem:-) > A little tracing in the source, shows that the following patch, will work - The proposed solution is not appropriate from security viewpoint, but as already mentioned, proper solution will be provided in the upcoming update, which will be released shortly. Meanwhile just write over the old recording in exact same way it was originally performed, namely with 'growisofs -Z /dev/cd0c ...'. > Can anybody tell wether the author's expectation is wrong, Yes, my expectations were wrong, it's a bug and well be fixed. Cheers. A.