DVD writing gives incorrect data

[Bill Shannon]

I'm using VirtualBox 2.1.2 on Ubuntu 8.04. The guest OS is Windows XP with guest additions installed.

I'm trying to create a video DVD using Nero under Windows. I've got the host DVD drive mounted with passthrough.

I created a video DVD using Nero 9. I wrote the files to a folder so I ended up with a VIDEO_TS folder and all the files in it.

I used Nero Burning ROM to write those files to a video DVD.

I then read the files back off the DVD and compared with the original files on disk. In one of the large video files, I see two bytes that read back as zeroes every 65536 bytes.

If I use K3B under the host Linux system to write the same original DVD video files to a blank disk, and then read those files back, they're identical to the originals. That convinces me that the DVD drive and general DVD writing is working - it's not a hardware or Linux problem.

[Frank Mehnert]

Any chance for a VBox.log file of the two different VM sessions (one for Nero9 writing the DVD, one for K3B writing the DVD)?

[Bill Shannon]

I've attached the VBox.log file I found. I've done so many things with this virtual machine to try to narrow down the problem that I'm not 100% sure this is from the session where I last tried to write the disk, but I think it is. If that's not what it looks like to you, let me know and I'll do it all again and attach a new log file.

Note that there won't be a VBox.log file when using K3B because that's being done on the host OS, not under VirtualBox.

[Frank Mehnert]

Ok, that log file doesn't show any fatal error. I think would could fix your problem only if we provide you a debug build which would do some more logging. Would you like to do some more tests?

[Bill Shannon]

Yes, I'd be happy to do some more tests with a debug version.

And if you have a simple test program that will run under Windows and write a video DVD and read it back to compare, that might be useful as well.

[Frank Mehnert]

For Windows there is ​Infrarecorder. I will be back to you with a special debug version.

[kookyman]

Relates to and/or duplicates Tickets #903, #913, #983, #2641.

[Frank Mehnert]

We found a problem but fixing still needs some time. It seems that ATAPI packets to the CD/DVD drive bigger than 65534 bytes are stripped.

[Bill Shannon]

Any news on this bug? This is the only thing keeping me from replacing my physical Windows machine with a virtual machine.

[Frank Mehnert]

Sorry, still no fix in sight.

[Technologov]

DVD writing doesn't deserve "blocker" status, it must be reduced to "major".

-Technologov

[Bill Shannon]

Any chance this will get attention anytime soon?

[Frank Mehnert]

There was a fix for passthrough mode in VBox 4.1.6 but I'm not sure if this will finally fix your problem. Feedback would be appreciated.

[Frank Mehnert]

No response, closing.