PSP downloadable content (DLC), add-ons, and bonus items save to either the Internal Memory (on PSPgo) or a Memory Stick Duo. The folder structure is consistent:
PSP/GAME/ # Main game folders; DLC often in subfolders here
PSP/DOWNLOAD/ # Primary location for PlayStation Store downloads
PSP/SAVEDATA/ # Sometimes contains bonus unlock files
Almost all Store-purchased DLC lands in PSP/DOWNLOAD/ initially. After installation, files may move to PSP/GAME/[GAMEID]/.
Always copy your PSP folder to a PC before moving, renaming, or deleting anything. A single misplaced file can break a game or DLC license.
With this map, you can manage your PSP content confidently—whether backing up, transferring to a new Memory Stick, or troubleshooting missing add-ons.