CD Speed goes red starting at 16 PIF.
It is a limit decided by the author, from experimentation I guess, inferior to the theoretical limit of 32 .
On the other hand, as it uses ECC 8 or making a total of 8 blocks, 32 could be any of the following situations
- 8 blocks with 4 PIF
- 2 blocks with 16 PIF, and 6 blocks with 0
- 1 block of 32 PIF and 7 blocks of 0
Only the first situation is acceptable. This is one point where ECC1 method is more accurate.