Re: Unbelievable slow speeds when burning DVDs
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
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni)
schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
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