1:1 copies don't work on all computers

[gh0sth@cker]

But have you considered the ATIP check?

Every CD-R contains an ATIP - this contains info on dye colour, length, manufacturer etc. Pressed cd's (originals) don't have an ATIP as they are pressed so don't need one. Most of the new games have a secondary protection to check for an ATIP; if an ATIP is found then it knows it's a copy. The problem with this protection (and it's the main reason why it's a secondary protection) is that only cd-writers can read ATIP; normal CD-ROM's cannot.
So the solution is to play the game in a CD-ROM. For those without a CD-ROM drive, then Hide CD-R Media is the solution as it hides the fact that the cd has an ATIP (works like an emulator).

If this isn't the solution then I would guess that it's not actaully a 1:1 copy. Fifa WC is Safedisk 2.51 and hard to copy - it depends on what writer you have - what writer do you use to copy it? For example, some writers are only capable of making a copy of the game that is only playable in the actual writer.