Hi,

> As source I used the downloaded ISO of PartedMagic from 2012_11_30.
> I simply opened this with Brasero to start burning on a DVD-RW,
> which first had to be erased.

The bug that was fixed here did not affect burning of prepared
ISO images, but only composition of ISO images from hard disk
files and burning them to media without storing the images
ntermediately on hard disk.

So your problem is probably something different.


> After some time I saw 100% complete and something like
> "finalizing the media" and I continuously recognized mechanical
> movements from the readers head.

Unformatted DVD-RW get filled up to at least one full GB when they
get closed. The image pmagic_2012_11_30.iso has only 274 MB.
But 5 to 10 minutes for padding 750 MB would mean only 1x write speed.


> Then shortly I saw something with "successful", but I was unsure,
> if it was caused by my click or if it had happened anyway.

If the drive's activity was still about closing the medium then you
would have few chance to interrupt it. Only power-off would do.
But if Brasero was attempting to read an unreadable medium, then
it might have been your Abort which ended the torture.


> I'm wondering why Brasero doesn't have a "After burning check the
> content" option.

I would not be astonished if the strange behavior happened
in the course of a verification attempt. 
To my knowledge it would use readcd. (I am not a regular Brasero
user.) 

-------------------------------------------------------------------

What happens if you use one of my programs for burning the image ?
They are based on libburn like Brasero is by default, but elsewise
they do not share code with Brasero.
Under the assumption that your burner has the address /dev/sr0
and that a DVD-RW is inserted:

  xorriso -as cdrecord -v dev=/dev/sr0 blank=deformat_quickest \
                       -eject pmagic_2012_11_30.iso

On a 4x DVD-RW, extra fast blanking lasts about 30 seconds.
Writing then shows about 30 seconds of zero progress.
Then i get progress messages about 4x write speed.
After about 50 further seconds i get a long time of messages
  xorriso : UPDATE :  274 of  274 MB written (fifo  0%) [buf  99%]   0.0x.
with steady burn noise. No head movements to hear.
The burn run ends after a total of 264 seconds.

A checkread based on the medium's block checksums (DVD ECC)
can be done by:

  xorriso -indev /dev/sr0 -check_media -- -eject all

should yield
  Media current: DVD-RW sequential recording
  Media status : is written , is closed
  Boot record  : El Torito , ISOLINUX isohybrid MBR pointing to boot image
  Media summary: 1 session, 140438 data blocks,  274m data,     0 free
  Volume id    : 'Parted Magic'
  xorriso : UPDATE : 32 blocks read in 5 seconds , 0.0xD
  xorriso : UPDATE : 1792 blocks read in 6 seconds , 2.6xD
  ...
  xorriso : UPDATE : 140438 blocks read in 96 seconds = 2.2xD

Hope for no messages like this
  libburn : SORRY : SCSI error on read_10(16064,32): [3 11 05] Medium error. L-EC uncorrectable error.
If they come frequently and progress is slow, then abort by Ctrl+C.
libburn gets such messages from the drive if the ECC redundancy does
not suffice to obtain a credible data block.

A readable medium should yield at the end:
  Media checks :        lba ,       size , quality
  Media region :          0 ,     140438 , + good


> I could burn successfully with Windows 7 right after.

Was this with the same DVD-RW medium and the same burner ?

Well, i just made two tests with above command.
The first one really yielded above SCSI error.
In the second write-and-check test, no read errors occured.

DVD-RW are somewhat adventurous media.
I prefer to format them:
  xorriso -outdev /dev/sr0 -format as_needed -eject all
and to use no blank=deformat_quickest when writing to them.
As its name says, that option would deformat the medium.


Have a nice day :)

Thomas