Can I change hard drives from one playstation to another

Yes, depending on whether you have a slim, or not, the procedure is different, but you should have no problem with compatibility. I don't have a PS3, so I'm not sure how you remove the slim's hard drive, but I have worked on "Fat" PS3's and the hard drive is on the side, just pop off the cover, and remove one screw, then the drive.

"As Shane said, it's physically possible to take the drive out of one PS3 and into another but it won't preserve all your data. Use the transfer utility, it works quite well and if you've only got a few things then it won't take too long.

Another way, depending on what you want to save, is to backup your saved games etc to a USB hard drive and then copy them to the new PS3. You can't copy everything, but by-and-large you can copy everything you can't replace by downloading again."

If you have the new firmware update 3,56 it isnt possibel to swap / upgrade harddrive in a ps3.. I hope Sony soon will com with a new update to fix this bug - so my PS3 can come up and running again.

"You could back up your data though the backup utility in the PS3 system's menu. Get a USb flash drive, or if needed a USB external USB drive to back up your system settings, game data and game saves.

As for any downloadable content, any games or media purchase from the Play Station Store can be re downloaded with out an additional charge."

Yeah might work it just depends on what the problem is