Exchanged HDDs without a hitch, got another of the same model/capacity. Ran Hddhackr and did firmware. Worked like a charm and everything is up and running. Oddly it never mentioned on screen doing the partition 0/2/3 step. It told me it was ready to install in the xbox anyway, so I went ahead...
I suspect it may have died. The HD doesn't seem to spin anymore, and I've tried using a few different power cables to be sure. I'll have to return it to the store and get another. Atleast I know how to do this now. :|
I did the undo, which apparently was successful. I turned off my PC and waited 10 seconds. Then booted up and deleted the undo.bin from the thumbdrive. I tried then running hddhackr, it found the harddrive but did not display a manufacturer name for it. I tried flashing the firmware but it...
I have hddhackr v1.30 and the 250GB HDDSS.bin file from this guide: https://digiex.net/guides-reviews/console-guides/xbox-360-guides/3152-xbox-360-how-hack-250gb-sata-drive-work-xbox-360-xbox-360-slim.html
the hdd I have is a WD Blue Scorpio BEVT (manufactured 2011).
First I mistakenly tried...