Expanding PSP Storage: Memory Stick Pro Duo, M2, microSD Adapters

The PSP uses proprietary Sony memory cards. Your expansion options depend entirely on the model:

By Model

Model	Slot	Max Official	Best Modern Option
PSP-1000 / 2000 / 3000	Memory Stick Pro Duo	32GB (Pro Duo Mark 2)	Pro Duo → microSD Adapter (dual or single slot) + 128–512GB microSD (SanDisk Extreme / Samsung EVO). Cheap, huge, fast.
PSP Go (N1000)	Memory Stick Micro (M2) + 16GB Internal	32GB M2	M2 → microSD Adapter + microSD. Or use 16GB internal + CFW to mount ISO from USB host (PC/PS3) via USB cable.
PSP Street (E1000)	Memory Stick Pro Duo	32GB	Same as 1000/2000/3000: Pro Duo → microSD adapter.

Critical Tips

Buy Name-Brand Adapters: Cheap no-name adapters corrupt saves, disconnect randomly. Photofast CR-5400 (dual microSD → Pro Duo) is legendary but discontinued; modern equivalents: Kioxia / SanDisk / Samsung branded adapters or reputable Amazon brands (e.g., "Memorette", "Inland").
Format in PSP: Settings → System Settings → Format Memory Stick. Creates correct folder structure (/PSP/GAME, /PSP/SAVEDATA, /ISO, /VIDEO, /MUSIC, /PHOTO).
CFW Requirement for ISOs: To play games from Memory Stick (ISO/CSO in /ISO), you need Custom Firmware (PRO / ME / Infinity / HEN). See hacks.guide.
Speed Class: UHS-I U3/V30 (A1/A2) microSD ensures smooth 333/444MHz CPU gameplay, fast ISO loading.

External USB (PSP Go Only)

PSP Go has USB Device mode (connect to PC/PS3/USB charger) but no USB Host — cannot plug in flash drive directly. Some CFW plugins enable USB Host via the proprietary dock connector (rare cable needed). Not practical.

Best value: PSP-2000/3000 + Pro Duo → microSD adapter + 256GB microSD + CFW. Holds entire UMD library + homebrew + media.

PSP Games