Date: Tue, 3 Jan 2006 11:59:21 -0500 (EST) From: Marc Evans <Marc@SoftwareHackery.Com> To: freebsd-questions@freebsd.org Subject: Problems reading CDRW after writing Message-ID: <20060103115853.W37815@me.softwarehackery.com>
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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 <CD-RW 52X24/K.NC> 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
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