DISC I/O ERROR
This error often occurs right before a loading screen. The possible error codes are:
- 0000: Tried to load 0 sectors.
- 0001: Timeout when reading TOC.
- 0002: Timeout when reading data sector.
- 0003: Copy protection tripped. Caused by the game itself. Writes "DISK" instead of "DISC".
The possible causes are:
- The CD drive gave up reading because of a mechanical or optical problem.
- The game uses copy protection.
- When a file requested for loading isn't found in the CD's table of contents (should never happen on an original CD, except if the TOC zone is physically damaged).
If the CD is an original one:
- It may be dirty or scratched.
- The CD drive may need adjustments or repair.
If the CD is a copy:
- It may have been re-authored (not an exact copy of an original). Even if the files are the same, the structure might have been altered.
- It may use copy protection.
- The CD drive may need adjustments or repair.
This is the case for games using file versions in their ISO 9660 structure, like Metal Slug 2 - Super Vehicle-001/II. Most Windows ISO image editors strip the version info which is needed by the game to identify the files. Use mkisofs WITHOUT THE -N FLAG, or edit the loading tables in the main PRG file.