I sort of answered my own question, I think. I tried to restore my original image to the Black 1T drive twice more and both times the restore fails at the same point. So, I tried again, but this time I did not issue the hdparm (dma) commands. The restore is now taking place, ever so slow, but it is working. I'm guessing about 20 times slower than with the hdparm commands issued. I don't know why the copy with hdparm command worked on one drive and not the other, but if the restore will work w/o that command, I don't care. Thank you for all of the information in the forum and a shoulder to cry on.