> > 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. Thank you, Vasilis
