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Patient HDD ID: WD3200BEKT-60V5T1
Family: Saturn
2 platters / 4 heads

Failure symptoms:
Undetected; Capacity 0
All firmware modules were listed, available, read/write was normal, no head damage, data area blocked.

Tried firmware repair solutions:
Slow repair; firmware module testing and all firmware modules were found ok.
Manually checked the translator and other key firmware modules and all were ok.

Final firmware repair solution:
Back up the key firmware modules and rom;
Format SA;
Download one set of donor firmware with very close microcode, only the last digit was different.
Write donor ROM;
Load module dir to get module list;
Load module dir to ram;
Load loaders(For some old ROYL drives, this is not needed)
Write all donor firmware modules, firmware restart and wait until the drive got ready and detected;
Write original key firmware modules;
Firmware restart and access to the data area normally.

Tools used to recover the lost data: DFL-DDP data recovery tool, DFL WD firmware repair tool.