I got permission from a fellow aircheck collector to print this...makes good sense:
"Do not put labels or write on the DVD's or CD's. I have found that labels can dissolve the protective lacquer coating if the adhesive is based on a solvent that the lacquer is susceptible to. Asymmetric labels can throw the disc out of balance, causing read problems, and labels not designed for CDs or DVD's might bubble or peel off when subjected to long periods of heat inside a CD/DVD drive. The ink in some kinds of pens may damage the top coating of the disc."
Have a good weekend, all!
Bud S. (firstname.lastname@example.org)