My Hitachi time machine drive just started S.M.A.R.T. failing abruptly, so I took it out of my Mac Pro and put in a different drive to backup my stuff with temporarily while I get this one replaced. This morning I tried putting the faulty drive in again to see if I could at least erase the data before sending it to Hitachi, and my computer won't start up with it inside. The drive has a copy of All my data on it (or at least did). If it is still retrievable by anybody, is there any reason for me to be hesitant about sending it in for a replacement? What are their protocols for this kind of thing?