When you replaced the HSA, did you transfer the adaptives of the donor HSA
to the patient drive? There are parameters such as MR bias, microjogs
(spacing between read and write elements), and preamp gains that differ
between drives. These values are written to the "ROM" on the PCB.
Otherwise, if your drive had already begun to degrade before the HSA was
damaged, then there is a "slow fix" solution which disables relocation and
certain aspects of error correction at the firmware level (by editing
modules 02 and 32 in the reserved service area on the platters).
Scott Dwyer's HDDSuperTool has scripts which implement this "fix":
http://www.sdcomputingservice.com/hddsupertool
Headstack matching for Western Digital:
http://www.hddoracle.com/viewtopic.php?f=86&t=1036&p=4555
The following article explains why your drive did not survive the power
supply failure and how you can "fix" the faulty overvoltage protection on
your other WD drives so that they will survive future overvoltage events.
Catastrophic failures in Western Digital PCBs:
http://www.hddoracle.com/viewtopic.php?f=59&t=1119&p=5033
-Franc Zabkar
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