Panasonic CF-W2 Series Reference Manual page 64

About DVD Media
To Avoid Damaging Disks
NOTE
[Confirm Region] will also be displayed if a DVD-Video with one region code is
inserted into a drive for which another region code has already been set
Do not touch the data surface (the side opposite the side with the title printed on it). This
can cause the disk to become dirty or scratched
Do not allow disks to become dirty or scratched
Do not place or store disks in locations exposed to heat, direct sunlight, humidity or dust
Do not write on the surface of the disk with a ballpoint pen or other writing instrument, nor
paste paper to it
Do not drop, bend, or place heavy objects on top of disks
If the disk is moved from the cold to a warm environment, moisture may form on the disk.
Wipe this moisture off with a soft, dry, lint-free cloth before use
Cleaning the disk using a disk cleaner is recommended once every 2 or 3 months
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