Things You'll Need
Instructions
Load the UMD into your PSP and turn on the system.
Press the PSP's "Select" button and navigate to "USB Device." Change the setting to read "UMD Disc" and hit "X" to confirm your selection.
Connect your PSP to the USB port of your computer using the USB cable. Open "USB Connection" from the console's "Settings" menu.
Open "My Computer" or "Finder" and wait for the UMD game to appear as a new drive on your computer. It may have the name of the PSP game or appear as a string of numbers and letters. Double-click this drive to open it.
Drag the "ISO" file inside your PSP game's drive onto your computer's desktop. The entire disc data will be copied to your computer's hard drive.