|The are 3 distinct area's when you look at the bottom of a GD-ROM disc.
The low-density inner track (dark gray) contains about 35 Mb (4 mins) DATA which is also accessible by normal CD-Readers.
The outer track (light gray) contains about 1 Gb (112 mins) DATA but is written in a high density format which can NOT be accessed by normal CD-Readers.
The area between the two tracks (black) doesn't contain DATA and acts like a border. In this ring the following texts can be read:
- Produced by or under license from sega enterprises LTDs
- Trademark SEGA
A normal CD-Reader will only read the first, inner track and won't read past the black area. Even if it could read past the black area then it can't read the high density track.