What did the EFI update do?

Exactly what did the update do? It said it fixed start up, and wake from sleep problems.
I'm wondering if it fixed my problem, or if I still have to re-install OSX.
I called apple care a few days ago, they said that my hard drive wasn't mounting correctly, and thats what gave me the folder with question mark when I had to restart my MBP because a freeze.
Does anyone know if the update will help me there? Or if I should just go ahead and re-install OSX? I would prefer not to re-install OSX, because I dont want to have to re-install all the updates, FCE, and replace all my files that I have backed up on my Ipod right now.

The mounting problem could be a problem with the operating system.
When you start your computer and it goes through a list of things to do as it starts up. Somewhere along the line your computer has turned on the harddrive and has said hello only to find that the software on the harddrive isn't saying hi back.
The guy on the phone thinks that by reinstalling the operating system on the harddrive you will fix the communication problem that is occuring between the computer and harddrive. I agree with him. By reinstalling the operating system you will find the problem should go away. Otherwaise if it doesn't you may need to call Apple Care and tell them your problem and what you have done so far to fix it. They will most likely replace the Harddrive which shouldn't take them too much time.
This is a very simple and not completely correct way of explaining what may be / may not be happening with your harddrive.

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