Nope mate, you can't do that...
PS3 internal hdd has a proprietary format, it's not ext2.
So you either have to use a FTP homebrew or Comegenie to move/copy all your games to another drive.
Don't forget to also use the built-in function to backup your profile(s) and saves.
Then just upgrade your drive.
You'd better check some tuts here before starting to switch, just in case you missed a step.
PS3 Slim v3.55 + CFW Kmeaw - 250G/USB 1T
XBOX 360 Falconv3/Jtag - Liteon74 1.61 - 500G
Wii 4.2 + Cfg UsbLoader - USB 250G | NDS + M3 Real - SDHC 8G | NDS + R4i - SDHC 4G
PS2 + HDLoader - HDD 200G | PSX + PS Hacker