Google could link to sites that are potentially unsafe. Hence why I said I would prefer not online.
*Snrk*
Man, how do you even use the internet?
On topic, however; any USB storage device is compatible with the PS3 and PS4 as far as I'm aware. I would suggest buying a proper HDD and sticking it in your PS3, however as it should be faster than anything over USB which is important on modern consoles since they love to install the games to the system. You can find guides online which detail the process for upgrading the internal storage but it's not a complicated process AFAIK.