[k3b] [Bug 380067] [MATSHITA BD-MLT UJ240AS] :-( unable to WRITE at LBA=6d9a00h: Input/output error

[Thomas Schmitt]

https://bugs.kde.org/show_bug.cgi?id=380067

--- Comment #38 from Thomas Schmitt <scdbackup at gmx.net> ---
Hi,

i think the new message in
 
https://cgit.kde.org/k3b.git/commit/?id=41e6f110c7f2753b20537c23bad56b8ac4896ba2
is a bit courageous and makes the user wonder why the message is
emitted at all:

> "Found files bigger than 2 GB. These files will be fully accessible."

I propose to either
- omit the message (and only check for mkisofs option -allow-limited-size)
- or to state that the files may be problematic on very old Linux and
  on systems which do not mount the UDF aspect of an ISO by default.


Reasoning:

The Large File Support of Linux stems from the early years of this
century. E.g. these are introductions with modification dates 2004
and 2005:
  https://people.redhat.com/berrange/notes/largefile.html
  http://users.suse.com/~aj/linux_lfs.html
The latter is talking of kernels 2.2 and 2.4.

mkisofs with option -udf produces both sets of metadata: ISO 9660 and UDF.
Linux and MS-Windows mount UDF by default if they see such a ISO 9660/UDF
hybrid filesystem. The other operating systems have to be suspected to
not handle large data files in ISO 9660 correctly. The ones among them,
which do not mount the UDF aspect by default, will show problems.

On POSIX compliant systems, which cannot properly read large files
from ISO 9660 filesystems, it should be possible to use GNU xorriso
for extracting large files to the local disk.
Large File Support by the local operating system is then mandatory,
of course. (xorriso can cut a large file into pieces before putting
it onto hard disk. But such pieces are of course cumbersome to use.)

Have a nice day :)

Thomas

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