nothing like bricking your Xbox
still you pay the price for trying to take the cheap route to modding your box, have fun trying to unlock the drive so you can attach it to a pc for re-installation of the system files, your boot block should still be ok, but getting the system files back onto the drive might be a tad difficult now seeing as the Xbox drives are not out of the box compatible with a pc.
golden rule #1 - If it's not broken, dont try to 'fix' it.
still, best of luck.
Ohd Chinese Ploverb say : Wise Eskimo, not eat yerrow snow.