[Debburn-devel] Problem with TSSTcorp TS-L632N drive

[Thomas Schmitt]

Hi,

Avramucz Peter wrote:
> wodim -tao ubuntu-8.10-desktop-i386.iso && ...
> Bad sectors (incl. with poor timing): 44
> wodim -sao ubuntu-8.10-desktop-i386.iso  &&& ...
> Bad sectors (incl. with poor timing): 0
> So, it seems to be, that you are right

It matches nicely the theory, indeed.


> Maybe, -sao should be the default option.

That would be quite fatal for any application
which assumes TAO behavior as default.
I myself provide such and would react angry
on behalf of my users.

A default padding of 300 kB with TAO would
be less obtrusive but still might cause problems
with some applications which try to squeeze
as many bytes on a CD as possible.

My solution in cdrskin is to examine the job and
the media state. Then it uses -tao or -sao as
needed ... or refuses and tells why the job does
not match the media state.


cdck -vt wrote:
> Disc contains BAD or even readable sectors, put it into trash can!

The media is ok. This can happen with any
TAO CD . The disc complies to MMC standard
but there is an old Linux kernel problem.
Known since at least 10 years and source of
interesting urban legends. Especially since
the needed padsize grew over the years.

I wonder whether cdck reads the media via
the Linux block device driver. I would have
expected that the CDROM ioctls allow to
control the alignment of read operations.
If i obtain data via libburn then i can read
up to the last 2 non-data sectors in a TAO
track. Those two are the trouble makers and
do not contain any payload.


Have a nice day :)

Thomas