Avoid Scratching the Top of a CD
Most of us are aware that scratching the bottom of a CD (where the music data resides) can damage it. However, many people do not know that scratching the top (or printed side) of a CD can also damage it as well.
The data written on a CD actually resides very close to the top of the disc. The top is coated with a metallic layer and lacquer to protect the data. Scratches, marks, mars, and other damage to the top can penetrate these protective layers and harm the data.
So be careful with both the top and bottom of a CD to ensure a long life of use. Always place CDs in jewel boxes or other CD protectors. Plus, if you write on a CD always use soft felt tip pens, preferably with CD and DVD safe markers.