Re: growisofs and PX-716: impossible changing burning speed after the first burn.
On Thursday 08 June 2006 16:15, Andy Polyakov wrote:
> >> - reboot the system;
> >> - put 16x media in unit and collect
'dvd+rw-mediainfo /dev/cdrom
> >> verbose' output;
> >> - perform 8x recording;
> >> - put another 16x media in unit and collect another
> > 'dvd+rw-mediainfo
> >> /dev/cdrom verbose' output;
> >>
> >> Send both to me.
> >
> > Here attached there are the two outputs.
> > Hope they can be useful.
>
> It sound like firmware bug...
>
> >
------------------------------------------------------------------------
> >
> > INQUIRY: [PLEXTOR ][DVDR PX-716A ][1.09]
> > Current Write Speed: 16.0x1385=22160KB/s
> > Write Speed #0: 16.0x1385=22160KB/s
> > Write Speed #1: 12.0x1385=16620KB/s
> > Write Speed #2: 8.0x1385=11080KB/s
> > Write Speed #3: 6.0x1385=8310KB/s
> > Write Speed #4: 4.0x1385=5540KB/s
> > GET CURRENT PERFORMANCE:
> > Write Performance: 6.0x1385=8310KB/s@0 ->
16.0x1385=22160KB/s@2295103
> > GET PERFORMANCE:
> > Speed Descriptor#0: 02/2295104 R@12.0x1385=16620KB/s
W@16.0x1385=22160KB/s
> > Speed Descriptor#1: 02/2295104 R@12.0x1385=16620KB/s
W@12.0x1385=16620KB/s
> > Speed Descriptor#2: 02/2295104 R@12.0x1385=16620KB/s
W@8.0x1385=11080KB/s
> > Speed Descriptor#3: 02/2295104 R@12.0x1385=16620KB/s
W@6.0x1385=8310KB/s
> > Speed Descriptor#4: 02/2295104 R@12.0x1385=16620KB/s
W@4.0x1385=5540KB/s
> >
> >
------------------------------------------------------------------------
> >
> > INQUIRY: [PLEXTOR ][DVDR PX-716A ][1.09]
> > Current Write Speed: 8.0x1385=11080KB/s
> > Write Speed #0: 16.0x1385=22160KB/s
> > Write Speed #1: 12.0x1385=16620KB/s
> > Write Speed #2: 8.0x1385=11080KB/s
> > Write Speed #3: 6.0x1385=8310KB/s
> > Write Speed #4: 4.0x1385=5540KB/s
> > GET CURRENT PERFORMANCE:
> > Write Performance: 6.0x1385=8310KB/s@0 ->
16.0x1385=22160KB/s@2295103
> > GET PERFORMANCE:
> > Speed Descriptor#0: 02/2295104 R@12.0x1385=16620KB/s
W@16.0x1385=22160KB/s
> > Speed Descriptor#1: 02/2295104 R@12.0x1385=16620KB/s
W@12.0x1385=16620KB/s
> > Speed Descriptor#2: 02/2295104 R@12.0x1385=16620KB/s
W@8.0x1385=11080KB/s
> > Speed Descriptor#3: 02/2295104 R@12.0x1385=16620KB/s
W@6.0x1385=8310KB/s
> > Speed Descriptor#4: 02/2295104 R@12.0x1385=16620KB/s
W@4.0x1385=5540KB/s
>
> Note that "GET CURRENT PERFORMANCE" returns 16x in both cases,
while
> "Current Write Speed" is 8x in second case. The value obtained by
"GET
> CURRENT PERFORMANCE," "Write Performance" is commonly controlled
by "SET
> STREAMING" command, while "Current Write Speed" [exposed through
"page
> 2A"] - by "SET CD SPEED" command. Now, specification says that DVD
> recording speed shall be controlled by "SET STREAMING," while "SET
CD
> SPEED" [as well as "page 2A"] is retained for legacy CD recording
[and
> other] software. In other words new software is *expected* to use
"SET
> STREAMING" unit is *expected* to respect it. Some units even don't
> expose DVD recording velocities through "page 2A," and any attempt
to
> change its values has *no* effect on DVD recordings. Nor should it
have
> according to specification! And your firmware seems to violate
this
> clause by favoring "Current Write Speed"... File bug report to
Plextor...
Shame on Plextor...
> Try if attached snippet can reset "Current Write Speed" to 16x.
Save it
> to dvd+rw-tools source directory and compile with 'g++
resetspeed.cpp'.
> What it does is send "restore all defaults" to unit, though
through "SET
> STREAMING" command. A.
Thanks for the snipped but unfortunately it doesn't work!
I've tried to launch resetspeed /dev/dvd ( with the inserted
medium ) also from root but after a 8x burn, dvd+rw-mediainfo
reports always:
Current Write Speed: 8.0x1385=11080KB/s
Regards.
Stefano
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