Re: Unbelievable slow speeds when burning DVDs
On Friday 15 July 2005 03:38 am, Joerg Schilling wrote:
> Vasileios Gkanis <gkanis@cems.umn.edu> wrote:
> > > > cdrecord has a special option for this case: -immed (see man page)
> > >
> > > I burned some data (4.3GB) on two discs. The first disc was burned with
> > > the "-immed" option and the second disc was not. Unfortunately, the
> > > first disc was lost, some of the data can not be read. Both discs were
> > > burned at an average speed of ~2x and the maximum speed was ~4x. But,
> > > when I used the "-immed" option I burned only 100MB at ~4x, and then
> > > the speed dropped to ~2x. When I did not use this option I burned about
> > > 500MB at ~4x, and then again the speed dropped to ~2x. Interestingly,
> > > the speed increased from ~2x to ~4x when about 500MB were already
> > > written on the disc. But before it increased, the hard disk stopped
> > > transfering any data, the speed dropped to ~0.1x and stayed there for a
> > > couple of seconds, and then it increased to 4x.
> > >
> > > Do all these make sense? Do you think this is normal?
> > > Without any information nobody can help you
> > >
> > >
> > > http://cdrecord.berlios.de/old/private/problems.html
> > >
> > > Jörg
> >
> > Yes, you are right, I am sorry about that. Let me start with the very
> > basic: OS: Gentoo
> > Kernel: 2.6.12_rc6 love-srouces
> > Cdrecrotd-Prodvd: 2.01.01
> > Mkisofs: 2.1
> > The DVD disc was a Verbatim 16x DVD-R, and the driver is QSI DVD+/-RW
> > SDW-082 (Firmware LX44) with maximum speed 8x.
> > The command that I issued (as root) was
> > mkisofs -V "Data" -R /home/vasilis/data/ | /root/cdrecord-wrapper.sh -v
> > -sao tsize=2276518s -dev=ATA:0,1,0 driveropts=burnfree speed=8 -
> >
> > The DVD disc was burned without any error, but the burning speed was
> > increased to ~4x, for a couple of minutes, and then it decreased to ~2x.
> > The hard disk was always transfering data, but when the burning speed
> > changed to 4x and then back to 2x, for a couple of seconds the hard disk
> > stopped transfering data.
> >
> > The system is a Centrino at 2Ghz with 512MB RAM, dma is enabled on both
> > hard disc and DVD drive. hdparm -tT /dev/hda shows that the maximum
> > transfer rate from/to the hard disc is ~30MB/s.
> > The system has and IDE controller
> > 0000:00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
> > Family) IDE Controller (rev 04)
> > which is supported in the kernel.
> >
> > I do not know if these informations are helpfull, but this is all I got.
> > If you want me to send you the output of cdrecord-prodvd -V, I will
> > gladly do it.
>
> I still don't understand.
>
> I thought you had problems when writing with -immed
>
> I thought the disk made with -imme was defective.
>
> Jörg
Yes, the disc with the "-immed" option is defective, but I never said that I
got any error. My only concern is that I burned the disc at ~2x and only for
a fraction of time I burned at~4x. Here is the command that I run
mkisofs -V "Data" -R /home/vasilis/data/ | /root/cdrecord-wrapper.sh -v
-sao tsize=2276518s -dev=ATA:0,1,0 driveropts=burnfree speed=8 -
and this is with the "-immed" option
mkisofs -V "Data" -R /home/vasilis/data/ | /root/cdrecord-wrapper.sh -v
sao tsize=2276518s -immed -dev=ATA:0,1,0 driveropts=burnfree speed=8 -
bill davidsen:
The fifo is about ~100% and the buf is 76% (this is also its maximum value).
So, it is not like the fifo is getting empty. Although, when the speed
dropped to ~0.5x, the buf. decreased to ~13% and fifo decreased to ~70%.
I am in a middle of something, but in a couple of hours I will send you the
output from the command that I executed.
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