Compact Discs are normally 12 cm in diameter and 1.2 mm thick. Pits are formed in the polycarbonate disk layer by an injection molding process. This is then referred to as the data layer. A thin layer (50-100 nm) of metal (aluminum - most cases, gold or silver) covers the pits to act as the reflective layer. Following metal deposition, a thin plastic layer (10-30 microns) is spin-coated on over the metal. This can be a nitrocellulose layer suitable for air-drying, or an acrylic plastic that is cured in UV and acts as the protective layer. Finally, a label or logo may be silk-screened on the top. Notice that the pits are far closer to the protective/silk-screened side of the disk (~ 20 microns) than they are to the read-side of the disk (~1.1 mm). Thus, it is easier to permanently damage a disk by scratching the top -- than the bottom! That is why a scratch on the label side can be da@n near fatal to the life of that cd.
I agree with the above posters about getting the cd replaced.
Good luck and be careful with that packing tape.
L
I agree with the above posters about getting the cd replaced.
Good luck and be careful with that packing tape.
L