Quote Originally Posted by bfalls
Has anyone heard what happens if you update and already have an additional OS on the PS3? Does the update disable the installed OS, or just not allow you to load one? If it doesn't disable an installed OS wait until you decide if you want one before performing the update. I think I would also update to a larger drive to ensure you won't run out of space later.
If you install the firmware downgrade and have the OS, the OS will disappear along with all the data you have. Back up your data first, and then do the download if you like.

For me upgrading the hard drive was one of the first things I did when I really got into this great machine. 2 years later, I still do not hear the fan noise everyone is talking about.