Re: Unbelievable slow speeds when burning DVDs
Vasileios Gkanis wrote:
Just for grins, since these devices are on the same cable, crank up the
fifo size and see if that helps. Something like "fs=30m" should show you
what's happening. Are you running as root? Sorry if you said and I
missed it. I doubt that fifo trick will help, or Joerg would have
mentioned it, but worth trying.
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.
cdrecord has a special option for this case: -immed (see man page)
Do all these make sense? Do you think this is normal?
Without any information nobody can help you
Yes, you are right, I am sorry about that. Let me start with the very basic:
Kernel: 2.6.12_rc6 love-srouces
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
Keep in mind your firmware may just not like this brand of media, as
evidenced by the same behaviour under that other o/s. But it shouldn't hang.
bill davidsen <email@example.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979