I agree with fzabkar's analysis ... with a couple of refinements. There is no doubt that ~15GB of
consecutive sectors/LBAs are unreadable. Now, that # of tracks (~12k) seems a lot for a single
serpentine pass, but Mfgrs/models will employ varying strategies ["Different strokes ..."
]. But those 3 (x15GB) runs might comprise a single Zone, and, maybe, a single ancillary, but critical, low-level formatting/servo-related (factory-calibrated) parameter for that one head/surface for that one Zone, has become glitched.
Considering that the head must be OK (reads every other area), and it's hard to imagine that single band of that surface being so consistently, and totally, damaged,
without the corresponding head being damaged; suggests a non-hardware cause.
Out of curiosity, did you find this drive by the roadside? or do you know its history prior to this fubar discovery?
I'd feel safe partitioning it as 825 | 15 | 75 | 15 | 75 | 15 | 975 , not using the 3x15s.
--UhClem