no, they're on a proprietary medium that is a lot like SD cards for digital cameras. i think it's just a different version of non-volatile flash ram... but not certain bout that.
so, no it isn't a disc... but not a cartridge either. i think for a portable system a disc drive would consume too much battery power and the medium would be less durable. i know my counting crows CDs feel that way. 
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If you will not fight when your victory will be sure and not too costly, you may come to the moment when you will have to fight with all the odds against you and only a precarious chance for survival. There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves.
~ Winston Churchill
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