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Sony 4GB Memory Stick Pro Duo
superb genuine 4 gig sony perfect for psp. I purchased several memory sticks from other retailers including 'toys are us' and had to return them all because they were fake cards. All the Sony cards from play are genuine. To check if a card is fake with a psp just go to memory card, press triangle and then more information. If the card is genuine it will say magicgate supported. If its fake it will say unknown or unsuported. Hope this helps some of you.I was so please these cards were genuine and can honestly say don`t buy anyware else apart from play.com or direct from sony. But play are so cheap it only makes sence to buy from them.hope it helps you decide.Yes they do work with iso's and homebrew software perfectly.