Below is a guide on How to Change the New Super Slim PS3 Hard Drive (via gamespot.com/features/how-to-change-the-new-super-slim-ps3-hard-drive-6396942/) for those interested:
While the new version of Sony's PlayStation 3 console isn't exactly short on hard drive space- particularly if you're picking up one of the 250GB or 500GB versions- those with large media collections, or those hoping to save a few pounds by picking up the 12GB flash version may be wondering how to replace the system's built in storage.
Unlike previous versions of the PlayStation 3, which had a visible hard drive slot, the super-slim's is cheekily concealed, and there's no information about the slot at all in the manual. Fortunately, replacing the hard drive is simple once you've figured out where its supposed to go.
Note that if you're replacing an old PS3 with the super-slim and want to retain all your data, you will first need to deactivate purchases on your old console, connect both of them together via ethernet, and use the Data Transfer Utility to transfer the files. You can find a full guide on the process here (manuals.playstation.net/document/en/ps3/current/settings/transferutility.html).
STEP ONE: First off, find the top of your PS3; that's the end without the rubber PlayStation logo nubbin covering the screw hole for the stand. Then slide the plastic side-panel away from you to reveal the hard drive slot.
STEP TWO: With the side-panel removed, the hard drive slot is revealed. Unscrew the blue screw using a standard philips-head screwdriver.
STEP THREE: Once you've removed screw simply pull the hard drive away from the console using the rather handy handle.
STEP FOUR: Flip the hard drive over to reveal four screws, which keep the metal caddy attached to it. You need to remove all four screws and then reattach them, along with the caddy to your new hard drive. Then simply slide the new hard drive into the console, reattach the screw and side panel, and you're good to go.
We noticed our new PS3 super-slim came fitted with a 7.5mm, 500GB hard drive. 7.5mm drives are typically used in slim laptops like ultrabooks, due to being thinner than standard 9.5mm drives. That said, the PS3's hard drive slot is large enough to accommodate 9.5mm drives should you wish to use one.