[Dvdrtools-users] DVD recording

[Konstantin Koll]

Dear members,

I've just subscribed to the dvdrtools-users list because I have a 
problem with DVD recording. I write my own operating system which 
already includes a burning software (see 
http://www.deskwork.de/FOTOS/BRENNEN.HTM for screenshot; it's in 
German). It can record CD-Rs and CD-R/Ws in TAO mode and works just fine.

Now, I'm up to extending it to DVD recording, but can't get it to 
work. What it can do now:
- Determine the DVD type inserted (-R, -R/W, +R, +R/W, -RAM and their 
properties)
- Blank a DVD-R/W
- DVD-RAM can be mounted like a harddisk and works just fine

What I'd like to have:
- Record pure ISO data DVD-Rs and DVD-R/Ws
- If the DVD-R code can be easily made working with DVD+R, I'll do 
it, otherwise ignore DVD+R
- Ignore DVD+R/W since they need formatting like a DVD-RAM, but have 
no random access and are much less reliable

Since a CD-R/W is just the same as a CD-R (except for blanking), I 
use a DVD-R/W for testing to save money on destroyed DVD-Rs. I use 
the following command sequence on my LG GSA-4167B:

- Set speed
- Set write parameters (use write mode 2, which is DAO with DVDs)
- Reserve track (i.e. 50000 sectos or whatever the ISO file size is)
- Get next writeable address (I get LBA 0 all the time which looks ok)

Now, sending data for LBA 0 fails. A sanity "close track/session" 
command takes some time to "finish" the DVD-R/W, and after that it 
has the space occupied, but without any data. The -R/W is closed and 
can be blanked.

Where's my mistake? I've read in the list archive that a DVD-R/W can 
only "simulate" continous recording - what does that mean? Thanks for 
helping me out, all answers are appreciated!

Yours,
Konstantin Koll