Memory Sticks currently
That is what qishan told me when I met up with him today. Well he does sell OEM memory sticks and he has yet to come across somebody who is using a original Sony Memory Stick.
He noticed the memory stick was different when he took it out from the PSP. He flipped over and noticed that it’s original. PSP further confirmed that that it’s original when it shows that MagicGate is supported which Sony OEM doesn’t support. Seems like there are alot of OEM (a nicer word for fake) Sony Memory Stick sellers around, even at Simlim Square. So if you wish to get a Sony Memory Stick, get it from the Sony Gallery or authorized dealers.