You will know if your PS2 Slim is modded if you are able to access things for free that you would normally have to purchase. For example, if a game add-on is available for sale from the PlayStation network, a modded PS2 may have access to this game at no charge. Another common modification given to these systems is the ability to play disks and programs that are not meant for these systems.
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An easy way to find out if your PS2 is modded is to put in a game that has been pirated. If it plays then the PS2 has been modified.
The PS2 slim does not have a harddrive
The PS2 Slim Plays all the PS2 games the Fat PS2 would.
the larger ps2 you can ...yes not the slim ps2
Only if the PS2 is modded with a modchip, FreeMC Boot, or CD/DVD Swap Magic.