There are some SA locked WD drives which do not allow head map as is.
This is about a case that was solved 2 months ago WD20NMVW-11EDZS7
8 heads and one of the head was totally AMNF
Process used to recover data without a transplant
1)USB board changed to SATA
2)Backed Up ROM
4)Relo was full, cleared it, unlocked SA in 02 permanently and did a slow read fix(can omit this at this step too ie the slow read fix)
5)Reflashed original ROM
6)Connect to DDI, Did a head map
7)Media test showed one head gone
Disabled that head in the DDI config.
9)Connected Drive to DFL, repatched 02 so now the SA is locked again, did Slow read fix.
10)NOW drive is again sa locked but DDI can work with the head map and disengage the faulty head while recovering the data from others at full speed.
Is there any way I can fix the AMNF error logically.. Have not tried to run the translator...Data is dispatched, can afford to experiment.
Hope some one finds this useful