Can´t mount written dvd´s. "Empty media" (SATA DVD+- Writer)

Binary package hint: linux-source-2.6.20

Hi,

Just today I bought a new (serial-ata) dvd burner. I just shut down my ubuntu 7.04 built in the drive and started up again.
So far everything worked well. It was detected by Linux and I burned the first DVD (using GnomeBaker) which successfully finished and can be read on other pc´s (tried on my laptop).
After that i tried to install a game with it which was unexpected hard to do. After inserting the DVD (burned) in my drive it was detected as "blank medium" and i was suggested to burn the disk.

The problem is not about the drive, its about reading burned dvd´s (cds work). Ubuntu just seems not to detect wether the disc is empty or written (and expects its empty).
Original CD´s and DVD´s work fine!

When mounting manual following happens:
> forsaken@forsaken-desktop:/$ mount /media/dvd
> mount: block device /dev/scd0 is write-protected, mounting read-only
> mount: wrong fs type, bad option, bad superblock on /dev/scd0,
> ... (text is known or not? ;-) )
> forsaken@forsaken-desktop:/$ dmesg | tail
> ... (wlan warnings on mass, has nothing to do with the problem)
> [ 1897.532208] cdrom: sr0: mrw address space DMA selected
> [ 1897.580295] cdrom: sr0: mrw address space DMA selected
> [ 1897.786464] UDF-fs: No VRS found
-EDIT-
After installing "udftools" it seems to try accessing more "header positions" but fails just like before:
> [ 4334.293186] cdrom: sr0: mrw address space DMA selected
> [ 4334.319792] cdrom: sr0: mrw address space DMA selected
> [ 4334.330792] attempt to access beyond end of device
> [ 4334.330796] sr0: rw=0, want=68, limit=4
> [ 4334.334356] attempt to access beyond end of device
> [ 4334.334360] sr0: rw=0, want=1252, limit=4
> [ 4334.334464] attempt to access beyond end of device
> [ 4334.334466] sr0: rw=0, want=1028, limit=4
> [ 4334.334559] UDF-fs: No partition found (1)

Obviously the udf-fs (which is tried first) is wrong, so i tried using iso9660. If i insert a (written) cd-r mounting with iso works fine. When inserting a dvd-r instead i´m getting these errors:
> forsaken@forsaken-desktop:/$ mount -t iso9660 /dev/sr0 /media/dvd
> mount: block device /dev/scd0 is write-protected, mounting read-only
> ... (as used)
> forsaken@forsaken-desktop:/$ dmesg | tail
> ... (wlan warnings on mass, has nothing to do with the problem)
> [ 2342.365568] cdrom: sr0: mrw address space DMA selected
> [ 2342.379328] attempt to access beyond end of device
> [ 2342.379332] sr0: rw=0, want=68, limit=4
> [ 2342.379432] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16

is there a way to fix that by configuring (which i didnt found in the last 4 hours -.-') or is this a bug?
If its a bug, please give some priority to this, all my backups are stored on dvd´s and i cant access them.
Some data about the drive and medium:
>> INQUIRY: [TSSTcorp][CD/DVDW SH-S183A][SB02]
>> GET [CURRENT] CONFIGURATION:
> Mounted Media: 11h, DVD-R Sequential
> Media ID: CMC MAG. AM3
>> Current Write Speed: 16.0x1385=22160KB/s
> ... (write speeds from 4x - 16x)
>> GET [CURRENT] PERFORMANCE:
> Write Performance: 16.0x1385=22160KB/s@[0 -> 2298496]
> ... (write speeds from 4x - 16x)
>> READ DVD STRUCTURE[#10h]:
> Media Book Type: 00h, DVD-ROM book [revision 0]
> Legacy lead-out at: 2298496*2KB=4707319808
>> READ DVD STRUCTURE[#0h]:
> Media Book Type: 25h, DVD-R book [revision 5]
> Last border-out at: 2045*2KB=4188160
>> READ DISC INFORMATION:
> Disc status: appendable
> Number of Sessions: 1
> State of Last Session: incomplete
> "Next" Track: 1
> Number of Tracks: 2
>> READ TRACK INFORMATION[#1]:
> Track State: complete incremental
> Track Start Address: 0*2KB
> Free Blocks: 0*2KB
> Track Size: 2102992*2KB
> Last Recorded Address: 2102991*2KB
>> READ TRACK INFORMATION[#2]:
> Track State: incomplete incremental
> Track Start Address: 2103008*2KB
> Next Writable Address: 2150016*2KB
> Free Blocks: 147872*2KB
> Track Size: 194880*2KB
> Last Recorded Address: 2149999*2KB
>> READ CAPACITY: 0*2048=0

Regards
Forsaken aka Jens