Alternately you can simply remove and replace the card. Some people believe that swapping cards while the PSP is on may lead to corruption of the filesystem on the card. While I have not personally experienced this, I tend to not remove my memory card while it is being accessed because I don't want to have to reformat and copy all my files again. However, do be sure to disconnect the USB mode from your PC before removing the card because that can lead to file system errors. Next is lettering. Here I mean both font and verbiage. The font is very similar on most cards, though some have a slightly stronger/bolder printing that might help you distinguish between them. But, more visible are simply the words. Many will state "PhotoFast CR-5400" as highlighted by the blue rectangle (which they aren't). The rest will just print a generically more honest "MS Pro Duo" and "Dual Slot Adapter."

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.In practice however the PSP is likely to give you several different kinds of "Format failed" errors. You may find after reading all the information presented here that you have no need to go beyond ~200, ~400, or ~500 GB in size based on other usability factors I will discuss below. Sony announced on June 1, 2009, that M2 support in Sony Ericsson phones would be dropped in favor of microSD. [31]

Note: Personally I was very concerned when I was unable to successfully format my card using the PSP. My thought process was that if the PSP is not able to successfully format the cards then it likely wouldn't be able to read/write data to them without issues either. This issue kept me from getting a successful build of a high capactity card for months as I searched and searched for adapters and MicroSD cards that would successfully format. CBS News, 48 Hours – AIBO, The Digital Wonder Dog: Sony Spends Millions On Robotic Canine". Cbsnews.com. February 11, 2009 . Retrieved November 13, 2011. Taub, Eric A. (February 2, 2004). "TECHNOLOGY; Memory Evolution: Survival of the Smallest". The New York Times.This process simply entails re-formatting your card through the PC. After putting your PSP in "USB Connection" mode and seeing the drive letter appear in windows we need to reformat.

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). As we can see from the picture above we can break down these cards based on several identifying factors. Try a different CFW (though I doubt it will make a difference as long as both support high capacity).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. The PhotoFast link includes some information about spotting fakes - but the thing is these days pretty much everything is a fake - or at least not a "name brand." This isn't all bad news though because the genuine CR-5400 cards can't even support MicroSD cards above 32 GB. So if you want to build a card with more than 64 GB of memory you need to find another (no-name) brand. Now - that being said, CSO compressed games are far from unplayable and in most cases won't have you twiddling your thumbs either. If anyone tells you that CSO (Compressed ISO) loading speed is negligible compared to ISO, they're lying. 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.

While I don't have any experience with them directly they are likely easier to work with since they use only a single card for formatting and therefore would be only a physical adapter (as opposed to circuitry which combines two cards into one). If you have or can get a deal on a single MicroSD of the capacity you want (say 1x 256 or 512 GB) you might be better off just getting one of these single adapter cards.

You can manually recreate this structure by copying it from another working card that formats successfully in your PSP. While it is possible to go 400 GB+ larger cards are going to have speed penalties when loading the card. Your formatting tool should provide an option for Cluster Size (possibly called "allocation unit size"). So you want a 256 GB card? There are some advantages in buying 1 x 256 GB MicroSD instead of 2 x 128 GB. The ONLY thing of importance is that after the format the PSP can see your inserted memory card with all the available space that was formatted!!!