problem with some audio CD

Valeri Galtsev galtsev at
Tue Oct 2 14:49:05 UTC 2018

On 10/2/18 5:41 AM, Matthias Apitz wrote:
> Hello,
> I have some audio CD which is part of a French school book. This CD, on
> insert in all my FreeBSD laptops, does not even come ready and gives
> continuous errors in /var/log/messages (see below). The system is:
> $ uname -a
> FreeBSD c720-r314251 12.0-CURRENT FreeBSD 12.0-CURRENT #1 r314251M: Fri Jun 30 08:50:03 CEST 2017     guru at c720-r314251:/usr/obj/usr/src/sys/GENERIC  amd64
> In my CD/DVD player of my TV equipment and in a Win7 laptop the CD is
> working. Is this some kind of copy protection?

Without looking at errors I would recommend this: find CD only optical 
drive, and read CD on it (and maybe make disk image if it is legal to 
make backup image of content sold to you in your locality). The reason 
is pure physics: laser heads used for CDs and CD/DVD combos (and Bluray, 
- the last will be using DVD part of optics) are different, and 
sometimes CD/DVD reader that has sharper beam has less success reading 
CDs (especially older/aged, etc).

I hope, this helps.


> Any ideas? Thanks
> 	matthias
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247

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