Put the 8gb back in the Xbox, then use flash fxp to copy the drives to your PC hard drive. There's not much on an original Xbox hard drive, probably only about 412mb max on the C/D/E/Y drives as such. Then burn those files to a CD-R.
If you need to ressurect the 8gb for any reason, use the HDD prep utility available here, zero out the 8gb and then flash fxp the drive files back to the HDD that you burned on your CD-R.
There you go, an 8gb drive back to orginal. As far as straight ghosting, I think I know of a way that it can be done, but have to look into it.