Getting errors writing large iso image to DVD (bug in atapi driver?)

[Andriy Babiy]

----- Original Message -----
From: Yuri <yuri at rawbw.com>
Date: Wednesday, October 31, 2007 11:05
Subject: Getting errors writing large iso image to DVD (bug in atapi driver?)
To: freebsd-questions at freebsd.org
Cc: yuri at tsoft.com

> I am trying to write iso image to blank DVD-R.
> Every time I try (with a new blank disk of course) I get this error:
> 
>  4534108160/4691437568 (96.6%) @15.8x, remaining 0:10 RBU 
> 100.0% UBU  53.1%
>  :-[ WRITE at LBA=21df50h failed with SK=3h/ASC=0Ch/ACQ=00h]: 
> Input/output error
>  :-( write failed: Input/output error
>  /dev/pass0: flushing cache
>  /dev/pass0: updating RMA
>  /dev/pass0: closing disc
> 
> And dmesg says:
> g_vfs_done():acd0[READ(offset=4290936832, length=65536)]error = 5
> acd0: FAILURE - READ_BIG MEDIUM ERROR asc=0x11 ascq=0x05
> g_vfs_done():acd0[READ(offset=4290936832, length=4096)]error = 5
> acd0: FAILURE - READ_BIG MEDIUM ERROR asc=0x11 ascq=0x05
> g_vfs_done():acd0[READ(offset=4290940928, length=65536)]error = 5
> 
> ISO file is very large, almost at the limit: 4691437568 bytes. 
> (limit is
> 4700000000+tiny bit).
> I use command 'growisofs -dvd-compat -speed=16 -Z 
> /dev/cd0=my.iso' to write.
> And my burner is brand new PIONEER DVD-RW DVR-112D 1.21. Burned 
> only 5-6 DVDs yet.
> 
> Why would is such error be reproducible?
> I vaguely remember that my old writer (Sony) had similar problem 
> and particular
> large iso images were reproducibly failing with the similar message.
> 
> Does this suggest that ATAPI driver has some bug?
> 
> Thanks,
> Yuri
> 
> FreeBSD xxx.xxx.xxx 6.2-STABLE FreeBSD 6.2-STABLE #9: Tue 
> Oct  2 01:27:22 PDT
> 2007     
> yuri at xxx.xxx.xxx:/usr/obj/usr/src/sys/GENERIC  i386

Just a question: do both DVD disks and DVD writer have a maximum speed limit x16?
I am asking because I experienced similar problem on TDK disks; in my case the speed limit was x8. The writer managed to successfully write some disks while failing on others. After I have limited speed to x4, all the disks were written successfully. It looks like when I go maximum, the disk quality is in question. Have you tried setting the speed limit below the maximum?

HTH,
Andriy