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Re: is my drive defect - request for comments

On  1 Mar, Thomas Schmitt wrote:
> Hi,
> Joerg Schilling wrote:
>> people in most cases solve their problems by writing in RAW mode
>> or by killing hald.
> If raw mode prevents hald from disturbing a
> burn run then this is an undocumented feature.

Just one more comment (Attn: I don't know anything
about the techniques of recording on a CD/DVD)

As Joerg suggested in private mail, I tried
using cdrecord after I had stopped hald.
So on my system even without hald running
cdrecord refused to write even the first sector.
Switching to -raw96r mode (on a CD) did succeed
but readcd -c2scan failed.
Joerg said that my drive (LG GH22NS30 SATA)
does not support c2 scanning. But then I wonder
why it didn't get errors for all sectors (just many).

I tried PLATINUM and VERBATIM media.
This seems to be connected to this burner (and its
predecessor LG GH20NS15)

I have two PC (both AMD 64 running a recent Linux
system with an 2.6.26 or 2.6.28 kernel)
Both show this problem (with cdrecord only).

I don't think it has to do with this recent Linux kernels
since on two 32bit machines, running 2.6.26/8, as well, I have no
problems though with an older (LG) burner.

I managed to burn the CD with cdrskin, I mounted
that CD and compared to the source directory.
And the data was OK.
I tried to "verify" that same CD with readcd (c2scan)
and it failed with many sectors.

cdrecord even failed to burn a DVD on those machines,
while growisofs succeeded.

NOTE, this is just the short history, no rating !

Thomas suggested to use CDCK which validated
both the CD and the DVD. But unfortunately
that checks timings only and therefore is only an
indirect measure of quality.

I wished there a were a tool which could show
"near failures" on a CD and on a DVD,
since I use my burner for backup purposes only.
And I want to be able to access my data even several
years in the future (e.g. digital photographs)

Thanks for all your help and I explicitly include
Joerg here, as well.
I have been using cdrtools for many years now and it
had worked and is working flawlessly except on this new hardware.


Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

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