I am using a dual micro sd to memory stick adapter from Amazon (the cheap white one), populated with a 200 Gb and a 128 Gb micro SD card.
The PSP itself was not able to format the stick correctly (showed too little storage after selecting format memory stick under settings). So I connected the PSP to the PC via USB and formatted the stick using Windows with guiformat. And then it showed up correctly (~300 Gb free).
I almost filled it up already. I only have 24 Gb left. Everything works perfectly. I will probably upgrade to 400 Gb by buying another 200 Gb micro sd card once they become cheaper.
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