After all, weak sectors are ordinary data sectors, so WS-based protections do not exploit any deviations from the standards to make it work. The question I don’t fully understand is what is responsible for not being able to write such sectors correctly. I guess it could be one of the following:
CD-recorders don’t implement “merging bits” algorithm correctly, as required by the standard, which leads to improper pit pattern.
Ecma-130 itself has a flaw. Though it makes a best effort to keep DSV around zero, it still allows for such a sequence which drives DSV unacceptably high.
CD-readers technology has a flaw. It must read correctly high-DSV patterns though zero-DSV is preferred.
As I understand, the third reason is not the case, since pressed disks do contain the same weak sectors and are read correctly by all readers.
If my first guess is correct, then it could have some interesting legal implications, since all recorders don’t implement correctly there main function ? burning files. For example, I can sue a recorder producer for not being able to burn efmgame.iso file.