Re: CLOSE SESSION failed with SK=5h/INVALID FIELD IN CDB: not harmless?

Thomas Schmitt wrote:
>> When I read the block from /dev/sr0 what I get back is all-zeroes. The
>> corresponding block on the udf image is full of non-zero data.
>>  the next 2048-byte block following 8585216 on /dev/sr1 is non-zero.
>>     
>
> Ouchers.
> That looks much like a failure of transport or
> drive. 
> It happens far before any Close Session failure
> could spoil it directly, and it is hard to
> imagine how such a final problem should leave
> 8 MB unaltered and spoil a single block of 2048
> bytes.
> If possible try to find out whether there are
> more differing blocks in the image.
>
> It is a bit astounding that a first altered
> block at that address disturbed the UDF tree
> without any error message.
> Did you check your kernel logs already ?
>   
Sorry, I should have mentioned that. Yes, indeed I did check the kernel
logs and they were clean! This is the only thing in there:

[1379091.856282] UDF-fs INFO UDF: Mounting volume 'Old C', timestamp
2009/11/24 22:02 (11e0)

So it certainly sees /some/ of the UDF info. Gack!

I looked to see if I could find any messages that may have occurred
during writing also but no such luck, there are none to be found. FWIW
the drive is connected via USB:


[1215397.604019] usb 1-2: new high speed USB device using ehci_hcd and
address 5
[1215397.737008] usb 1-2: configuration #1 chosen from 1 choice
[1215397.737626] scsi8 : SCSI emulation for USB Mass Storage devices
[1215397.737706] usb-storage: device found at 5
[1215397.737709] usb-storage: waiting for device to settle before scanning
[1215402.736214] usb-storage: device scan complete
[1215404.170839] scsi 8:0:0:0: CD-ROM            HL-DT-ST BD-RE 
GGW-H20N  XJ03 PQ: 0 ANSI: 0
[1215404.190820] sr1: scsi3-mmc drive: 40x/40x writer dvd-ram cd/rw
xa/form2 cdda tray
[1215404.191254] sr 8:0:0:0: Attached scsi CD-ROM sr1
[1215404.192384] sr 8:0:0:0: Attached scsi generic sg4 type 5

> Well, it would be expensive to make lots of
> experiments and to compare the outcome.
> But currently i see not much other opportunity
> to gain wisdom.
>   
Certainly!
> My own experience with BD-R and BD-RE tells me
> that they are quite reliable. At least compared
> with early DVDs.
> So if you need that backup then first try
> single layer media. It should be not too
> cumbersome to split 37 GB onto 22.5 GB media.
> (I could provide my splitting backup program
>  scdbackup, though.)
>
> Any problem with the bus should show up with
> BD-RE as much as with BD-R or BD-R DL.
>
>   
I have one BD-RE media right now also so I'll give that a try, just to
see if I can get some other mistakes. I'll certainly be upset if it's
the drive--I've used it hardly at all. It seems that this drive
(Buffalo) is an LG OEM and LG has new firmware revisions but Buffalo is
not releasing any updates. Bogus!

-- 
Jens B. Jorgensen
[email protected]


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