I'm not sure, I doubt it. memory cards are actually 16 blocks with the first being a toc, so it's 128KBs per memory card with each block being 8KB. you can manipulate it with other saves by just creating a fake save to index it in toc, then hexing in the save, which is what I did, so I got an actual memory card save using ulaunch.elf to work with psx classic. I don't think you can make it larger. at least, I've never seen anything that suggested you could. you can make ps2 memory cards up to like 32MBs or so on the ps3, I think, but I've never tried it. 64MBs+ is unstable or something from what I've heard.