I've got an interesting Seagate drive (ST2000LM007-1R81754 Mobile HDD 2TB) in the shop right now, wondering if anybody else has seen the behaviour. The drive has 4 heads, 3 of which are working flawlessly, but head 3 is intermittently either giving loss of readiness or returning the same sector data over and over again. When reading with the PC-3000 data extractor, the tool seems to have no idea and happily accepts this duplicate data for every sector. So I end up with several GB of "imaged" data but that data is 1/4th nonsense.
Has anybody seen this before? Is this a replace the heads situation or a firmware situation? I have tried reading in a number of different modes, all give similar results, except for "read with PC-3000 utility" which just gives me all blank sectors.