My ps2 (v7) says NTSC. Is there a difference between NTSC and USA (I live in the USA and will be playing backups of games I buy in the USA, like San Andreas etc..)? Im looking to buy on linker4u.com and they have both of these (NTSC and USA). I couldnt find it in the search and its the only thing I need to know before I order so whoever knows please respond quickly. Thanks in advance.