So i just got a psp 3000 and a psp 2000 last week. I bought probably like 9 games to get me started but i'm having a problem with only one of the games and for some reason. it won't save to the 4gb memory stick but it will save to the 1gb memory stick i have. I've tried formatting the 4 gb memory stick to see if that was the problem, but unfortunately it did not. The error more specifically says that there is insufficient free space, but i have over 3 gigs free. The difference between the two memory sticks is that the 1gb is just a regular sony 1 gb. The 4gb says "Mark 2" at the bottom. Any thoughts?