no...Aha, it must be a problem with the Timesplitters Future Perfect ISO I've been using I think - it was under 1GB, but the one I should be using is apparently 1.45GB.
Presumably I should get another one and shrink it?
if you are on mac or some other OS that reads size diferently its 1.45gb, on windowns its 1.35gb if its 1.45gb on mac and friends its a full iso.