i want to upgrade my ps3 so i want to know can i just swap my ps3 hdd with a new hdd or new hdd needs some hack(as on xbox360)????
If you're talking about the firmware to be upgraded go here: PS3. If you're on about hacking the PS3 then I can't help you, sorry. And if you're talking about upgrading the HDD go here: http://vgstrategies.about.com/od/ps3cheatsandcodes/a/PS3HDDDriveSwap.htm. Next time be more specific please
For using new hard drives in a ps3 it's as easy as plug n' play, so if you put a new drive in it should work just fine but I think taking an hard drive out and putting one in will do an instant format so be sure to copy your gamesaves to a flashdrive AND DON'T FORGET THE PROFILE! As PSN is down and will be for a week+ you won't be able to download your account from PSN if you accidently forget your profile.
Also remember the drives that are 12.5 mm in height will not fit in the PS3, only 9.5 mm drives will.
I put a 1TB hard drive in my friends PS3 I like there setup just because you can use any SATA Laptop HDD