I have a 1 gig scandisk pro duo that I have not had any problems with for the 8 months I've had it, and now all of a sudden it is not detected by my PSP or computer.
I was running a NES emulator on it (I'm still on 1.5 btw) and it was working fine, I saved a state (the first time I have done this using this particular emulator), kept playing for a while, and went to save again and all of a sudden I can't. I just figured the emulator was having some kind of glitch, so I hit home and went back to try to play a video, and my memory card is gone. I tried taking it out, a system restart (not just putting it in sleep mode), and reformatting the memory stick (which wouldn't work since it can't detect it), and my PSP is acting as if there isn't a memory stick in.
I put my original 32 mb stick in and it works fine, and I also tried hooking the PSP up to my computer with the 1 gig stick in, and it said to insert a disk into drive E (my PSP). I'm at a loss as to what is happening or if there is anything I can do to fix this. Any help/suggestions that you guys can give, I'd really appreciate.