Hitachi DF2200 Owner's Manual page 52

DVD Mode (Cont.)
Disc handling and maintenance tips
Hold the disc by the edges so the surface will not be soiled with fingerprints.
Fingerprints, dirt and scratches can cause skipping and distortion.
Do not write on the label side with a ball-point pen or other writing utensils.
Do not use record cleaning sprays, benzine, thinner, static electricity
prevention liquids.
Be careful not to drop or bend the disc.
Do not insert more than one disc in the disc compartment.
Do not try to close the disc cover when the disc is not inserted properly.
Be sure to store the disc in its exclusive case when not in use.
DO NOT store discs in humid or dusty areas, or where they are exposed to
direct sunlight or sources of heat (such as a heating appliance)
Cleaning dirty discs
If a disc is dirty, wipe the surface gently with a soft cloth, dampened with a
little water (no other liquids).
When wiping discs, always move the cloth from the centre hole towards the
outside, which will not cause distortion. (If you wipe the disc using a circular
motion, circular scratches are likely to occur, which will cause distortion.)
If the disc is brought from a cold to a warm environment, moisture may
form on the disc. Wipe this moisture off with a soft, dry, lint-free cloth before
using the disc.
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