Pro Duo adaptors : Important speed discovery!!! : r/PSP
Funturbo PSP Memory Stick Adapter, Micro SD to Memory Stick PRO Duo MagicGate Card for Sony
SANOXY Dual Slot MicroSD to MS PRO DUO Adapter for Sony PSP, Converts Two MicroSD or MicroSDHC Cards to one Memory Stick Pro Duo Card (Black) - Walmart.com