Hi,

> First I wrote the larger image [...] and, hu, everything went fine :-)

Less idle time with the last WRITE command.


> Then I wrote the smaller image without the dummy-option:
> ...
> As you can see, I didn't have to wait until the drive has stopped
> working because growisofs finished itself...

I expected the drive to work on for a while, after the kernel
brutally ended the SCSI transaction of the last WRITE command.
At that time, the burner has every information it needs to finish
the burn job. But it might last a few minutes until its really done.


> :-[ WRITE@LBA=17900h failed with SK=0h/ASC=00h/ACQ=03h]: Input/output error
> ... 
> Aug 15 12:53:54 t500 kernel: [23704.924138] ata2.00: exception Emask 0x0
> SAct 0x0 SErr 0x0 action 0x6 frozen
> Aug 15 12:53:54 t500 kernel: [23704.924149] sr 1:0:0:0: [sr0] CDB:
> Aug 15 12:53:54 t500 kernel: [23704.924152] Write(10): 2a 00 00 01 79 00
> 00 00 0d 00

So here we have the last WRITE command for block 0x17900.


> Aug 15 12:53:54 t500 kernel: [23704.924174] ata2: hard resetting link

This might have caused the burner to end prematurely.
Not sure, though.


> At last I compared the disc with the image, they seem to be identical:

It might of course be, that the kernel gets aware only when the
burner wants to deliver the status of the final WRITE.

Or it might be that the burned area ends less than 70 millimeters
away from the center of the DVD's hole. Please measure. :))

Whatever, the final error happens late enough so that the payload
data are already written to the medium, and that the medium does
not stay in an intermediate unusable state.


> btw., with bigger images the error occurs again, but this is what you
> expected, isn't it?

Not at all.
There is hardly a reason for a long execution time with the last
WRITE command, after the 70 millimeter limit was surpassed.

How long did the burner chew on the medium with 100% messages ?
  4251353088/4251365376 (100.0%) @0.0x, remaining 0:00 RBU   0.1% UBU 100.0%

> Aug 15 14:17:53 t500 kernel: [28743.900148] Write(10): 2a 00 00 1f ac d0
> 00 00 06 00

The failing WRITE is indeed the last one: 0x1facd0 = 2075856 decimal
with announced image size of 2075862.

If the execution time of this WRITE really justifies a timeout,
then your burner has a problem with DVD-R. This might be with
DVD-R in general, or just with the individual DVD-R which you
tired.


Have a nice day :)

Thomas

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https://bugs.launchpad.net/bugs/1356528

Title:
  k3b dvd burning crashes with growisofs and -use-the-force-luke=dao:
  option

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