Sega Saturn CD Cracked after 20 Years

Re:Sega Saturn CD Cracked after 20 Years by abrasive on Tuesday July 12, 2016 @07:27AM (#12078164)

The video's graphic is a bit of an approximation. In practice it appears that every second disc sector is displaced, IIRC. And they've got particular bit patterns written into them to produce a visual logo; these patterns (but not the actual logos) are checked too.

The protection ring is visible to the naked eye for this reason. I can't find a picture, sorry!

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Re:Sega Saturn CD Cracked after 20 Years by 0xcde4c3db on Tuesday July 12, 2016 @07:57PM (#12083061)

I tried to figure out how to reproduce the logo at one point (10+ years ago, when people were less worried about dying drives). IIRC, it's that the EFM patterns used to make the pixels don't make valid Red/Yellow Book sector contents, which causes some weird behavior if you try to read them as such.

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