- 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/[EMAIL PROTECTED] ->
16.0x1385=22160KB/[EMAIL PROTECTED]
GET PERFORMANCE:
Speed Descriptor#0: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#1: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#2: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#3: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#4: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/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/[EMAIL PROTECTED] ->
16.0x1385=22160KB/[EMAIL PROTECTED]
GET PERFORMANCE:
Speed Descriptor#0: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#1: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#2: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#3: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s
Speed Descriptor#4: 02/2295104 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/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...
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.
#include "transport.hxx"
main(int argc,char *argv[])
{ Scsi_Command cmd;
unsigned char pd[28];
int err;
if (argc<2)
fprintf (stderr,"usage: %s /dev/dvd\n",argv[0]),
exit(1);
if (!cmd.associate (argv[1]))
fprintf (stderr,"%s: unable to open: ",argv[1]), perror (NULL),
exit(1);
memset(pd,0,sizeof(pd));
pd[0]=4; // RDD
cmd[0]=0xB6; // SET STREAMING
cmd[10]=sizeof(pd);
cmd[11]=0;
if ((err=cmd.transport (WRITE,pd,sizeof(pd))))
sperror ("SET STREAMING",err),
exit(1);
}
