From owner-freebsd-questions@FreeBSD.ORG Tue Jan 3 17:07:26 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8D99616A420 for ; Tue, 3 Jan 2006 17:07:26 +0000 (GMT) (envelope-from Marc@SoftwareHackery.Com) Received: from mta13.adelphia.net (mta13.mail.adelphia.net [68.168.78.44]) by mx1.FreeBSD.org (Postfix) with ESMTP id C88F243D80 for ; Tue, 3 Jan 2006 17:07:21 +0000 (GMT) (envelope-from Marc@SoftwareHackery.Com) Received: from softwarehackery.com ([69.161.46.94]) by mta13.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20060103170720.XFJS26442.mta13.adelphia.net@softwarehackery.com> for ; Tue, 3 Jan 2006 12:07:20 -0500 Received: from localhost (localhost [127.0.0.1]) by softwarehackery.com (Postfix) with ESMTP id 271508CA8C for ; Tue, 3 Jan 2006 12:07:16 -0500 (EST) Date: Tue, 3 Jan 2006 12:07:16 -0500 (EST) From: Marc Evans To: freebsd-questions@freebsd.org Message-ID: <20060103120645.W37815@me.softwarehackery.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Subject: Problems reading CDRW after writing X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Jan 2006 17:07:26 -0000 Hello - I am running FreeBSD 6.0-STABLE as of Dec-15-2005 on a P4 system. I have a CDRW drive attached, which identifies as follows: acd0: CDRW at ata1-slave UDMA33 I wish to use this device to produce CDRW backup disks periodically. I use the following commands to produce the backup: burncd erase sleep 2 # needed to avoid READY error tar czf - ... | burncd data - fixate This appears to work fine, from the perspective of the output of the commands, e.g. I see output like: blanking CD - 100 % done next writeable LBA 0 writing from stdin written this track 633420 KB total 633420 KB fixating CD, please wait.. My problem is that attempts to read the data back, always fail: # tar tzf /dev/acd0 tar: Error opening archive: Error reading '/dev/acd0': Input/output error # ls -l /dev/*cd* crw-r----- 1 root operator 0, 93 Jan 3 10:33 /dev/acd0 crw-r----- 1 root operator 0, 127 Dec 30 14:26 /dev/acd0t01 No errors are shown in /var/log/messages. I have also tried writing an ISO9660 image and mounting it, with similar problems at mount time. The above said, I am able to create CD-R data disks and mount them or otherwise use them. I have tried several different CD-RW media, and played with -s (the media is rated as 12x), but have observed no changes. Can anyone suggest solutions? Thanks in advance - Marc