or if the cd was written with DirectCD... (adaptec, now roxio, packet writing software)
and the cd is unreadable, the format of the cd can be damaged...
usually i don't recommend software you have to purchase, but i used this
package to rescue a client's whole Italian vacation photos (only copy he had of them)
from a damaged DirectCD disc, only lost the ones where the actual scratch
was... about seven photos.cdroller's website
the program is pretty straight forward about what to do.