When I got my 512 pro duo, I immediately formatted it to FAT32, because I read a lot of books and such on the psp, and figured it would save me space. I noticed the 512 was much slower to write to, for copying files, save states, etc. I just formatted again, and went with the regular FAT formatting, and the transfer speed is once again great! I just transferred a 400+ mb movie in a little over a minute, something that took about 5-7 minutes before. Anyone else notice this? Try it, if you've gone to FAT32.