If you really need all that space on one card and don't mind the waiting while the memory card is initialized each time, then there should be no problems going to the higher capacities. The below has all been validated on this device running currently running 6.61 ME 2.3, though the vast majority of this should work on all of the standard PSP models using ME or PRO. There is a bit more detail below regarding FW versions (which are really beyond the scope of this guide). Taub, Eric A. (February 2, 2004). "TECHNOLOGY; Memory Evolution: Survival of the Smallest". The New York Times. I have personally confirmed mixing and matching of MicroSD cards of different sizes and speeds (although they were all the same brand - SanDisk). For instance I installed a 64 GB with a 16 GB to get ~72 GB (after format) of usable storage. If however you can't get the PSP to recognize the card with all space you will likely need to get a hold of another adapter, MicroSD card, or possibly CFW.

Additionally, all my tests were done with MicroSD cards up to 200 GB capacity (because I got a good deal on them). This means the largest high capacity setup I have personally tested is 400 GB. Theoretically, the information in this guide should be attainable for MicroSD cards of 256 GB, 512 GB, or even 1 TB in size. Practically however it may be that the adapters on the market today have a limitation or that the CFW will not indeed support such large sizes. I will leave it up to others who have the available hardware to test this. At this point the PSP drive letter should show as a good drive on the Windows system and you should be able to browse and copy files to/from it.As we can see from the picture above we can break down these cards based on several identifying factors. I am happy to report though that although the PSP has issues with the formatting, it appears that once it is formatted properly via PC the PSP has no troubles accessing the cards. So you want a 256 GB card? There are some advantages in buying 1 x 256 GB MicroSD instead of 2 x 128 GB.

You may opt for a smaller card and use CSOs to save space. Comparable to the speed differential, many games can be compressed considerably from their ISO forms. For what it is worth #5 would be my recommendation. This is because it was of a decent build quality and seemed to give the most consistent and reliable formatting results (more on that below).

Try a different CFW (though I doubt it will make a difference as long as both support high capacity).