Heres how I did mine ( and two others).
Softmod the original XBOX HD using Ndure 1.1 and the game of your choice.
During this process Ndure will prompt you to backup your EEProm - do that.
Once the the mod process is done, FTP the Krayzie Extras's folders to your Xbox E:\Apps directory.
Launch the Extras from Apps and proceed into the game save, this will unlock your shadowc (you will have to enter a password to get to this point, and your front LED should turn RED when the shadowc is unlocked)
At this point copy your C and E drives to your computer, and build the XBOXHDM disc.
Connect the new HD as the only HD in your computer. Boot to the XBOXHDM disc.
Follow the prompts to build your new HD. Pretty self explanatory once your in there.
Lock the HD. You shouldn't need a floppy with the eeprom provided you copied your backuped EEProm to the XBOXHDM folder before you build the disc.
Install new HD into XBOX, ensure that it boots. If so congrats!
Take your old Xbox HD, put it in a ESD bag and put it in a safe place, it will provide a backup incase your new HD decides to go kaput.