Credit goes to ori0n378e
from this thread http://community.us.playstation.com/t5/PlayStation
I did some digging and found that they make esata harddrive extenders. They replace the PS3's internal drive, with a circuit board that has the PS3's internal hdd connector and an eSata port to use any external drive you want.
PS3 Slim kit
PS3 Phat kits
(use google translate for this one)
I recommend if you're going to go this route, to use an externally powered hdd so you're not putting much of a burden on the device or the PS3's power supply.
Also, nearly NOTHING is known about these kits, so buyer beware.... theres no telling as to the limitations of these kits an whether or not you can just get the biggest hdd available (like a 4TB drive).
One more thing, you'll want to buy an "OEM" version of the hdd to keep costs low. And don't buy one of these external hdd's.... they're also expensive.
Just buy an OEM drive, and an ESATA powered external hdd enclosure.
the 2 PS3 Phat kits are on foreign websites so be aware of the currency exchange and shipping costs. Its also a good idea to make sure they are able to ship to you.
I do not assume nor accept any responsibility for the purchase and/or use of these devices or purchasing/checkout systems. Buyer Beware. Use at your own risk.
I shared these before; the slim version you've shown is pretty nice. But people need to know, that you MUST use a powered HDD. The SATA to eSATA connection is data only. I largest I've seen is up to 2TB. The best setup I saw was an external RAID exclosure set at RAID 1(mirroring) configuration with two 3.5 drives... an HDD goes bad, no big deal, it keeps working and replace the bad drive at your leasure.
Do people really need all that space?
Some people do.
They think its better to have their music and movies on it than on a PC.
Then again, I have a 10TB network storage for all my data so I don't have a need for it.