As mentioned in the comments in the linked article, it appears to be possible to improve capacity by an additional 9 percent with a more efficient GCR encoding.

As mentioned in the comments in the linked article, it appears to be possible to improve capacity by an additional 9 percent with a more efficient GCR encoding. https://csdb.dk/forums/?roomid=11&topicid=94092 https://csdb.dk/forums/?roomid=11&topicid=94092