Error Correction during CD replay // Super Black Hole from Herbie's Audio Lab


I tried my best but just cannot comprehend this statement from Herbie's page:  "Error correction in audio CD discs is not perfect; it is algorithm-based "guessing," not binary like in data CDs"
Why is that? and does this apply to, say, McIntosh players spinning discs at double speeds? What about CDs ripped onto HDD?
Any info or links very much appreciated.

For months now I am struggling with my Wadia 781i trying to understand why it refuses to play a few CDs from my collection. Narrowed down, at least some, to pressing defects: some CDs are seriously eccentric, when played on tiny Discmans such CDs make them jump like an unbalanced centrifuge! But only Wadia refuses to play such CDs.
sevs

Showing 2 responses by geoffkait

Whoa! What! Never use green on Grieg! 😀 I’d be interested to hear what happens with flat black. I predict you will not like the sound. But if you use black on the inner edge I predict it will be OK. You can also try purple on the outer edge. A lot depends on what the label color of the disc is. What color is the Grieg SACD?
I use Walkman CD players and Walkman cassette players. One thing that Walkman CD player has in common with full size CD players is vulnerability to background scattered light from the CD laser. The background scattered light is a combination of visible red light circa 650-700 nm and invisible near infrared light circa 700-800 nm. The background light is presumed by the rather dumb photodetector to be real signal. The green pen and other counter measures can be employed to amileorate this ubiquitous problem.