I am now on Kernel 2.6.32-26

For me 16x CD write speed is okay.

I have old hardware which was able to write DVDs at 1x, back in previous linux version.

Now, I dont get speed of less than 4x.

Tested on k3b, xfburn, and brasero. But all start at bottom 4x write speed. k3b forced back to 4x.

Tried on the cli tools like: growisofs, wodim, cdrecord, dvdrecord, makedvd. The speed forced back to 4x.

EXAMPLE:
=========
~$ growisofs -Z /dev/dvd -R -J -speed=1 /~/data2
Executing 'genisoimage -R -J /~/data2 | builtin_dd of=/dev/dvd obs=32k seek=0'
I: -input-charset not specified, using utf-8 (detected in locale settings)
0.22% done, estimate finish Mon Oct 10 11:06:16 2011
0.44% done, estimate finish Mon Oct 10 11:06:17 2011
0.66% done, estimate finish Mon Oct 10 11:06:17 2011
/dev/dvd: "Current Write Speed" is 4.1x1352KBps.
0.88% done, estimate finish Mon Oct 10 11:46:02 2011
1.10% done, estimate finish Mon Oct 10 11:39:35 2011



>>>>>>>>> It seems the problem is in the device detection or configuration.


How can I do it?

Thanks in advance.....

Can anyone guide me, where to find the device configuration.


/etc/hdparm.conf

doent seems to help out.

I have absolutely nothing to base this on, but could it be a hardware limit set in the drive itself?

I have also noticed that modern drives do not burn at less than 4x. Why exactly do you need to burn slower than this ?

When I write at lower speed say 1x/2x, all dvd roms read it easily.

The same recorder cannot itself read at 4x written dvd.

I have had similar reading issues as a result of using low quality disks. And have worked around it by lowering the write speed to as low as possible. Have you tried with some good quality disks?

Hi fukawi1

I think the issue is not the dvd quality.

With my cd-recoder I wrote upto 52x. But the ones written at 16x had the best playback.

It is seen that dvd playback or reading depends on write speed. and best at lowest write speed.

Recording/burning at 'max' speed is always buggier than burning at a slower speed. x52 vs x16, yeah, even if you were using the best media you could find on a fast computer (for the time) its still likely to be lower quality than a slower burnt disc.

You would see similar effect if you compared a DVD burnt at x20 to a x4 burn. That doesnt mean that a x4 burn is going to be dodgy at all.

BTW, the minimum burn speed is set by the drives firmware.

1 members found this post helpful.

Hi Cascade

If I run liveCD of Ubuntu 8.04, it lets me write at 1x.

But I have to under-grade and install 8.04 just to get lower speed. nd definitely miss a lot from 10.04. The usb read/wrtie is better in 10.04. Well many other advantages.

First I couldnt resolve xorg issue in gnome, so I jumped to xfce (Problem 80% solved). Now I am having hard time by DVD-RW.

So its IMPOSSIBLE?

IOf your dvd reader can't read a x4 written dvd (by itself), it is no much use. Time to say goodbye.

Try cdrecord [other_crazy_options] -vvn speed=1 some.iso
That will give you a speed of 1 for the device and will simulate a write at the lowest speed, and will tell you in the verbose output what that speed is.

In ubuntu 104 wodim has replaced cdrecord.

K3b uses wodim to write.

In k3b I issued record speed 1x, but it changed it to write at 4x.

wodim is similar - you can set the speed in that.But I repeat,

Hi bisiness_kid

All my work is fine with this dvd dev.

I fail to understand why I must go to get a new one.

All that needs to be done is cut down the write speed. The device is capable to do that.

You have also told us
That's why I suggested looking to a replacement. Everyone agrees slower is better. But if your drive cannot read what it writes at 4x that's a basic functionality lacking.