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Date:      Wed, 13 Mar 2002 21:57:02 -0500
From:      "Dan Langille" <dan@langille.org>
To:        Bjoern Fischer <bfischer@Techfak.Uni-Bielefeld.DE>
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: cdrecord under 4.5-stable
Message-ID:  <20020314025702.B45073F0E@bast.unixathome.org>
In-Reply-To: <20020313180702.GA1761@frolic.no-support.loc>
References:  <20020313164933.685BC3F0E@bast.unixathome.org>

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On 13 Mar 2002 at 19:07, Bjoern Fischer wrote:

> Hello Dan,
> 
> [...]
> > # cdrecord -eject speed=12 dev=0,5,0 repo.raw
> [...]
> > Sense Bytes: F0 00 03 00 00 26 FB 0A 00 00 00 00 0C 09 00 00 00 00
> > Sense Key: 0x3 Medium Error, Segment 0
> > Sense Code: 0x0C Qual 0x09 (write error - loss of streaming) Fru 0x0
> 
> Loss of streaming means that the CDR internal I/O buffer had an
> underflow. Probably there was some load on the machine, especially
> I/O on the same disk, where 'repo.raw' came from.
> 
> You may try the fs option of cdrecord to set a larger fifo buffer size.
> cdrecord locks the fifo buffer to prevent paging, so don't use too
> excessive values. On a machine with 256MB RAM and a moderately loaded
> 100MBit ethernet I use fs=24m when burning CDRs across the network.

The box isn't under any more load than previous burns.  The box contains 
the CDRW and the ISO image.  I have no idea why an underflow would occur 
given that not much has changed recently.  I think I'm going to test this 
with a recordable CD for a while...
-- 
Dan Langille
The FreeBSD Diary - http://freebsddiary.org/ - practical examples


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