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Date:      Wed, 19 Sep 2001 22:47:50 +0200
From:      "Karel J. Bosschaart" <karelj@wop21.wop.wtb.tue.nl>
To:        questions@freebsd.org
Subject:   first CD burner fails while starting second (cdrecord)
Message-ID:  <20010919224750.A27242@wop21.wop.wtb.tue.nl>

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I have two SCSI CD burners, HP CD-Writer+ 9200 1.0e (dev 0,6,0) and
PLEXTOR CD-R   PX-W4220T 1.04 (dev 0,4,0), and cdrecord 1.9 on FreeBSD 4.4.

When I'm starting to burn a CD on the 0,6,0 device while the 0,4,0 burner
is already burning, the 0,4,0 fails with

cdrecord: Input/output error. write_g1: scsi sendcmd: retryable error
CDB:  2A 00 00 04 A6 5A 00 00 1F 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: F0 00 03 00 04 A6 F2 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
Sense flags: Blk 304882 (valid) 

write track data: error after 624087040 bytes
Sense Bytes: 70 00 00 00 00 00 00 0A 00 00 00 00 00 00 00 00 00 00

It happened two times, so I don't think it's a coincidence with a bad CD.
When I start the 0,4,0 device while the other is burning, everything is fine.
Also, the buffer fill seems to be OK (min fill 98% after the failure).

Any idea what's causing this? Any tips on how to find the problem? 
Or am I not supposed to burn 2 CD's at a time? (If so, why?)
I couldn't find a hint on the cdrecord page.

Could it be that I should have recompiled cdrecord when going from 4.4-RC
to 4.4-STABLE ? It's often necessary after an upgrade, but I'd say that
the difference from 4.4-RC to STABLE is minimal.

Well, when I try to reproduce I'll use rewritables ;-).

Karel.

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