[CentOS] Using cdrecord on CentOS

William L. Maltby CentOS4Bill at triad.rr.com
Wed Apr 15 16:07:52 UTC 2009


On Wed, 2009-04-15 at 10:45 -0400, William L. Maltby wrote:
> On Wed, 2009-04-15 at 15:46 +0200, Niki Kovacs wrote:
> > Michael A. Peters a écrit :
> > 
> > >>
> > >> 1) Am I supposed to be root to use cdrecord and burn an .iso file?
> > > 
> > > I've found it works much better if you are root.
> > > 
> > 
> > I tried both, and see: cdrecord complains about not being able to set 
> > certain priorities while being run as user, which induces a high risk 
> > for buffer underruns. So I have my answer for that.
> > 
> > Another cdrecord-related question. Usually I should be able to copy a CD 
> > as simply as that:
> > 
> > $ dd if=/dev/cdrom of=copy.iso
> > 
> > Then insert a blank CD, and:
> > 
> > $ cdrecord -v -eject dev=/dev/cdrom copy.iso
> > 
> > Now I did that for data CDs, and it works very well. I thought, normally 
> > this *should* also work for audio CDs, so I gave that a spin. But 
> > everytime I try it, dd stops short and gives me an "Input/output error" 
> > for /dev/hdc.
> > 
> > I tried three different audio CDs, all three in good state. I can listen 
> > to them OK on the PC. But all I get with dd is a zero-byte-length 
> > copy.iso file.
> > 
> > Any idea what's happening?
> 
> Try padding copied image with a few hundred k of nulls.
> 
> dd if=/dev/zero of=copy.iso \
>   seek=<number of output blocks to skip forward> bs=2048

OOPS! Forgot to limit the output. Add count=<number of blocks> to the
end of the command.

> 
> <snip>

-- 
Bill



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