Does it really matter?...

[weirdwebby]

... whether I copy a playstation game on to a 650mb CD or a 700mb CD? My friend bought an import patched copy of Chrono Trigger, and I decided to try and burn it. ( I have a mod-chip). I couldn't use CDRWin (my brother put in an illegal serial number...) so I used CloneCD. It copied without any problems.
But when I tried to play it, it said "Insert a Playstation Disk".
Is it because I used an 700mb CD or is there another problem?

Thanks