Ah, my young friend. You appear to be in a sticky situation....
(Or should that be waxy situation....

)
Obviously you dont need to unlock your other HDD cos its dead.
Great.
I would advise you to get Slayer's disk (I didnt use it myself, so dont stand on me, but it seems to be the weapon of choice around here.)
Alternatively, put your new HDD in, and make an EvoX boot disc and then gain FTP access to the xbox.
Grab the MSdash out of the slayers disc, and put that on, and then all the other things you need.
Unfortunately, Im not sure if it has the E: folders you need (TDATA and UDATA), although Im sure it would as its used to reformat drives.
Sadly, instruction number one is ALWAYS to back up your old files.
Cant be of any more help myself. Anyone else?
bobjim17
(P.S - All the details of this you need IS available in the tutorials. Keep looking.)