You'll need a program called Jungleflasher. You'll need to extract the firmware (Drive operating system, it holds your DVD key) of your old drive with a SATA cable. Jungleflasher will take this key, and inject it into a separate firmware, which is called iXtreme. If you're using a different model of drive (The options are Samsung, Hitachi, BenQ, and LiteOn), you will need to do a process called spoofing.
The new drive will lie to the 360 and say it is your old drive. So if you have a Hitachi drive, and the old drive was a BenQ, Jungleflasher will take the BenQ key, inject it into iXtreme (firmware), which will then be modified to make the Hitachi look like a BenQ, and then overwrite the Hitachi firmware.
Complex to read, Jungleflasher has a PDF that explains every step.
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crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
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