Black splotches on bottom dye layer

Very odd don’t know what this is but disk still plays in computer or dvd player this is TDK dvd +r which cd speed identifies as CMC MAG 001 000 (00h)

I have several Verbatim CD-R with black splotches. An audio CD player plays through them ok.

When I tried to copy the disc it just can’t get past the first or second black spot… looked through rest of spindle and it seems fine…