[RESOLVED] Blank block or zero partition on DVD+RW

[ternor]

Hello.  I used K3b this morning to burn a remaster iso to a dvd+rw.

When checking the md5sum of the disk I got this error:

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isoinfo: Input/output error. Read error on old image
catdevice FATAL ERROR: Blank blocksize
I tried to use Gnome Baker to format the disk.  That failed and Gnome Baker had this to say:

* BD/DVD±RW/-RAM format utility by appro at fy.chalmers.se, version 7.1.
* 4.7GB DVD+RW media detected.
- unimplemented command-line option for this media.
- you have the option to re-run dvd+rw-format with:
  -lead-out  to elicit lead-out relocation for better
             DVD-ROM compatibility, data is not affected;
  -force     to enforce new format (not recommended)
             and wipe the data.

So I ran the suggested command and got this:

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# dvd+rw-format -lead-out /dev/sr0
* BD/DVD±RW/-RAM format utility by appro at fy.chalmers.se, version 7.1.
* 4.7GB DVD+RW media detected.
* relocating lead-out 0.0-
I subsequently ran e2fsck with various parameters all returning the same message.  This was the last:

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# e2fsck -c -f -k -p /dev/sr0
e2fsck: Attempt to read block from filesystem resulted in short read while trying to open /dev/sr0
Could this be a zero-length partition?
The disk cannot be mounted ("Could not mount the following device").  I don't know what to do or what, exactly, to look for.  Any help appreciated.

[djohnston]

I subsequently ran e2fsck with various parameters all returning the same message.  This was the last:

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# e2fsck -c -f -k -p /dev/sr0
e2fsck: Attempt to read block from filesystem resulted in short read while trying to open /dev/sr0
Could this be a zero-length partition?

It's highly unlikely the DVD contains an ext2/3/4 filesystem. It's a 99% probability it is iso9660. I don't know of a fsck method for the iso9660 filesystem.

To blank the optical disk, you need to know what bus device your recorder is. Open a terminal and enter:

cdrecord -scanbus

Your results will be similar to:

scsibus4:
   4,0,0   400) *
   4,1,0   401) 'ATAPI   ' 'DVD A  DH20A4P  ' '9P59' Removable CD-ROM
   4,2,0   402) *
   4,3,0   403) *
   4,4,0   404) *
   4,5,0   405) *
   4,6,0   406) *
   4,7,0   407) *

If you had the same setup as mine, your recording device number would be 4,1,0. Using mine as an example, do in a terminal:

cdrecord blank=fast dev=4,1,0
cdrecord blank=all dev=4,1,0

blank=fast will do a quick reformat. blank=all will do a full reformat. If you get erors, try this one:

dvd+rw-format -force /dev/dvd

If none of those work, it is almost certain that your optical disk has become defective or the recording devices has.

[ternor]

Thanks.  I have bookmarked your post.

Contrary to expectations, I burnt the image again with Gnome Baker and this time was able to extract the correct md5sum from the disk.  The last time I had a problem burning a live disk, it was the Gnome Baker burn which failed and the K3b burn which saved the day.  Go figure.

I'm going to buy some more USB sticks and try creating a bootable usb.  Marking this as resolved.

Thanks again for replying.

EDIT: I gave K3b two shots with the same result each time.