Okay I had a problem with the Crisis Core FMV lagging after going from a 4gb to an 8gb stick. After pulling my hair out and many hours trying to fix the problem, only to find a wealth of misinformation on the internet... hopefully this will help someone.
I have a fat psp running 3.90 m33-3 with the msfatmod and 1.50 kernel installed. Running the full iso off a real 8gb sandisk high speed purchased off amazon. I'm also not using any of the NO-UMD modes, as these didn't make any difference.
First of all YOU CANNOT FORMAT AN 8GB CARD TO FAT(16)! It will not work, as the format is native to 4gb and below. Strangely this seems to be everyone's solution and is posted everywhere.
What did finally do the trick was reformatting the stick via the psp again after installing the fatmsmod. The folder scheme ends up completely different and you'll have to rearrange some of your media files, but I believe this is due to the way fatmsmod accesses the card. All I know is it worked.
So update your CFW, install fatmsmod, and REFORMAT the card via the psp in that order (and yes in FAT32). Good luck
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