[Debburn-devel] cdrkit-1.1.6: wodim gets DVD+R max. writing speed wrong

[Thomas Schmitt]

Hi,

> I'm trying to burn an iso to a Verbatim 16x DVD+R with wodim. wodim
> refuses to burn at speeds higher than 6x because it somehow gets the
> idea that's the limit of the media or the drive.

Did you already try  driveropts=forcespeed  ?

man wodim gives some hope it might ignore the
drive's replies about speed.


> dvd+rw-mediainfo:
> ...
>  Current Write Speed:   1.0x1385=1411KB/s
>  Write Speed #0:        6.1x1385=8467KB/s
>  Write Speed #1:        5.1x1385=7056KB/s
>  Write Speed #2:        4.1x1385=5645KB/s
>  Write Speed #3:        3.1x1385=4234KB/s
>  Write Speed #4:        2.0x1385=2822KB/s
>  Write Speed #5:        1.0x1385=1411KB/s

These are CD speeds (1411 = 8xCD , 8467 = 48xCD).

A look into the source  dvd+rw-mediainfo.cpp reveils
that it reads this info from mode page 2Ah which stems
from the times of MMC-3 but is deprecated in MMC-5 E.11.

DVD speeds are better read from command ACh GET PERFORMANCE.

> GET [CURRENT] PERFORMANCE:
>  Write Performance:     6.0x1385=8310KB/s@[0 -> 2295104]
>  Speed Descriptor#0:    00/2295104 R at 16.0x1385=22160KB/s W at 18.0x1385=24930KB/s
>  Speed Descriptor#1:    03/2295104 R at 16.0x1385=22160KB/s W at 16.0x1385=22160KB/s
>  Speed Descriptor#2:    03/2295104 R at 12.0x1385=16620KB/s W at 12.0x1385=16620KB/s
>  Speed Descriptor#3:    00/2295104 R at 8.0x1385=11080KB/s W at 8.0x1385=11080KB/s
>  Speed Descriptor#4:    00/2295104 R at 8.0x1385=11080KB/s W at 6.0x1385=8310KB/s
>  Speed Descriptor#5:    00/2295104 R at 5.0x1385=6925KB/s W at 4.0x1385=5540KB/s
>  Speed Descriptor#6:    00/2295104 R at 5.0x1385=6925KB/s W at 2.4x1385=3324KB/s

Your drive promises up to 18xDVD as peak speed
and guarantees 16xDVD over the whole media size of 
2295104 blocks. (Is that 16x promise really true ?