History
The Sony PlayStation Portable, or PSP, is a handheld gaming device that was first released to the North American market on March 24, 2005.
Variations
The PSP comes in several retail configurations, colors and models.
Memory
Several types of memory can be used with the PSP. These include the Memory Stick Duo, MagicGate Memory Stick Duo, Memory Stick Duo (MagicGate/High Speed) and the Memory Stick PRO Duo.
Types
The PSP was originally sold with a 32 MB card, but higher capacities are available.
Size
The original Memory Stick was small, about the size of a stick of chewing gum, but the Memory Stick Duo is even smaller.
Considerations
The more files you want to have on-hand, the more memory you'll need. Personal preference will decide whether you require one high capacity card or several lower capacity cards.