http://www.gamepro.com/article/features/206951/how-to-supercharge-your-ps3/
Step #1:
Purchase the Samsung M6 500GB hard drive (widely available online for around $230). Important note: The M6 is the only 500GB internal hard drive that will fit into the PS3. Use the PS3's Backup function to transfer saves and other content to a USB drive.
Step #2:
Unplug the PS3 and ground yourself. Open the PS3's hard drive access port, located on the side of the unit, with your fingernail.
Step #3:
Carefully unscrew the blue screw using the correct screwdriver bit (Philips Precise) using gentle pressure, taking care not to strip the screw. Pull out the metal hinge, and slide the hard drive tray out.
Step #4:
Unscrew the four screws that attach the hard drive to the metal tray, and remove the old hard drive (place old drive in anti-static bag).
Step #5:
Attach the new Samsung 500GB hard drive to the tray, replacing the four screws from the previous step. Slide the hard drive tray back into the PS3 port, and snap the metal hinge back into place, then replace the blue screw. Close the access port, power up your PS3, and replace the date stored on your USB drive. Voila -- you're done! Enjoy your massive storage space.
