Hello, sorry this maybe a tad long winded! Right - I haven't had my psp for very long, I bought the memorystick separately off ebay, it's a 4GB one. It was working fine until I was playing Grand Theft Auto, when I tried to save my progress it would say "save failed" and would have some code after it. So I just exited out my game without saving thinkin' it was just havin' a dodgy moment. But then my psp started saying that the memorystick could not be read and told me to "format it in system settings". So I'd try and format it and my psp would tell me a memorystick is not inserted...so please has anyone got any ideas? Apparently I'm meant to format it on my computer but I'm not sure how to do this!? By the way, the memorystick has been inserted properly and it's been cleaned of dust. Any help off people who've had the same problem would be great. Thank you so much :-)