Not quite there yet. (IMG:
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You only need the "key" from the old drive, but you need to dump the FW to get it. What I meant by
you have to have a drive that is "hackable" is that if you had one of the new BenQ drives or other one that hasn't been hacked yet there would be no way for you to get the FW dumped and key extracted, but since you have a Sammy there's no worries on that part.
You would NOT want to flash our old drives FW to your new drive, unless it's the exact same make/model of drive. You just need to dump both drives FW, inject the old drives key into the new FW and reflash it to the new drive. Likewise, if you are going to replace the drive with a different make/model, switch from Samsung to a Hitachi or from ms25 to ms28, you'll have to "spoof" the FW so it reports that the drive is really a Samsung and the same version so the 360 will still be happy and not toss ya any E66 drive errors.
Without the key on the drive it will only play CDs and DVD movies, it will not play games at all. Each key is uniuqe to that 360/DVD, so you must have yours from the old drive to get a new drive to work 100% in it.