Where Is the ISO Folder on PSP? (It Doesn't Exist Until You Create It)

There is no "ISO folder" on the PSP's visible storage by default. The PSP does not mount ISOs as files in USB Mass Storage mode—you only see it if you've installed Custom Firmware (CFW) and created it yourself.

What You See When Connected via USB (Official Firmware)

The PSP appears as a removable drive with these folders:

• /PSP/GAME/ – Homebrew, demos, signed apps (EBOOT.PBP)
• /PSP/SAVEDATA/ – Game saves
• /PSP/SYSTEM/ – Browser bookmarks, network settings
• /MUSIC/, /PICTURE/, /VIDEO/ – Media files
• /ISO/ – Only appears if you have CFW and a plugin (like ISO Tool or UMD Dumper) created it.

How to Play ISOs on PSP (Requires CFW)

1. Install Custom Firmware (e.g., 6.61 PRO-C2, LME, Infinity) on a hackable PSP (1000, 2000 non-TA088v3, early 3000, Go).
2. Create /ISO/ folder on Memory Stick root (or use /PSP/GAME/ for CSO files).
3. Copy .ISO or .CSO files there (dumped from your own UMDs).
4. Launch from Memory Stick or Game menu (depends on CFW).

⚠ Legal Warning: Downloading ISOs you don't own is piracy. Dump your own UMDs.