Things You'll Need
Instructions
Create a folder on your external drive and call it "PS3." Create another folder within the "PS3" folder and name it "SAVEDATA" (use upper-case letters).
Put your PS3 game save into this folder. Safely remove your external drive from your PC once your game save finishes copying.
Insert your external drive into your PS3's USB port. Turn on your PS3 console and navigate to "Game" in the home screen. Navigate down to "Saved Data Utility."
Select your external USB device. Navigate to the game save file you want to download to your PS3. Press the triangle button on your controller, and select "Copy." Once your game save file has transferred to your PS3's hard drive, you can remove your external drive.