Fujitsu Siemens Computers Fujitsu-Siemens PC - Manual (Page 62)

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the fifth time, the code is retained as a permanent code; you
should therefore be careful about changing it. If you set the same
regional code as in the last installation, this is not registered as a
change. This process is determined on the hardware side and
cannot be cancelled using software.
Before buying a DVD video, you should check that the regional
code on the DVD video matches the code set on your PC.
... for using the correct blank DVDs
There is not a general standard for burning (writing) DVDs
currently. The most common recording methods for DVD burners
are: DVD+RW, DVD-RW and DVD-RAM. Although the
technologies are similar, each of these formats requires specific
blank DVDs and is based on a separate recording technology.
With most burning programs, you can find out under "Properties" or
"Infotool" which blanks can be used.
We recommend that on systems with Fujitsu Siemens Computers
DVD burners, the following blank DVDs be used:
DVD+RW rewritable blank DVDs or
DVD+R non-rewritable DVDs.