This post and this post describe some dying Hard Drives I ran across recently.
I found a screenshot I took while messing with one of the dead drives which is interesting and kinda funny:
After the drive failed to mount (and stopped screeching and clunking) I tried to mount it via a PATA-to-USB adaptor and saw the above. The funny thing to me is that the drive is actually 300GBs, not 2TBs. Maybe 2,199, 023, 255, 552 bytes is all the USB adapter can handle.