[k3b] [Bug 383140] Write speed

[Thomas Schmitt]

https://bugs.kde.org/show_bug.cgi?id=383140

Thomas Schmitt <scdbackup at gmx.net> changed:

           What    |Removed                     |Added
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                 CC|                            |scdbackup at gmx.net

--- Comment #1 from Thomas Schmitt <scdbackup at gmx.net> ---
Hi,

the failure by

> :-[ WRITE at LBA=7e70h failed with SK=6h/NOT READY TO READY CHANGE,
> MEDIUM MAY HAVE CHANGED]: Input/output error

is not necessarily caused by the high speed. (Although i have heard
DVD+R derail inside the drive at 20x speed. What a noise.)
The drive had a moment of inconsciousness and then reports to have
recovered from that. Nevertheless its reply to the emergency exit
by SCSI command FLUSH CACHE says again that it is busy or brainless.

The progress messages say that drive speed had reached just 6.3x
before the failure happened.


About the speed setting: growisofs asks the drive for speeds and
chooses what it deems best for the given speed wish of the user.
Either the drive did not offer 8x speed or growisofs failed to
properly choose that speed.

Program dvd+rw-mediainfo will tell the speed values offered by
the drive for the given medium. So insert a blank DVD+R from the same
box or spindle. Close the tray. Then run

  dvd+rw-mediainfo /dev/sr0

and look for lines like

   Write Speed #0:        16.0x1385=22160KB/s
   Write Speed #1:        12.0x1385=16620KB/s
   Write Speed #2:        8.0x1385=11080KB/s

If there is no "8.0x" line, then the drive does not offer that speed.
(It would still be ok to request it to use 8x, but it will probably not
 obey.)


Have a nice day :)

Thomas

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