Well I have tried 3 different ways to zero them out! I tried to zero them out first by hooking them up externally with a kit that I have to do that on my MacBook. Then I tried putting it into a Dell PC and zeroing it there with the same result. Then I put into our Logicube that we use to clone PC HDs end zero it there and it erred out there also. I hate to take a eMac all the way apparat just to replace the HD in it and not know if it will work or not or I would try that way too.