Hi InsaneNutter! It seems that i am out of luck with my HDD.
My console is xbox 360 slim and my drive is WD blue WD5000LPCX.

I've used hddhackr 1.40 and HDDSS from hitachi (from first page). Hddhackr reported that everything is fine, go use in console, but console did not recognize the drive (i cut the power as suggested, no reboot).
Now when i connected drive second time, hddhackr see it as hitachi

but when i tried to create partitions (as you suggested in other post) i get error in red "Choose another file name and try again! Choose another file name and try again!"

and computer hangs.
I also tried to recover drive to original state but received error like BELDAM did.

As the site does not allow to attach actual undo.bin file, here is screenshot of the beginning.

Have you any clue what can be wrong?
P.S.
I am booting from USB flash with HIREN Boot CD, in pure dos mode. My main board is Gigabyte ga-m57sli-s4, it's pretty old and there is no legacy mode (at least i could not find it).