West number hard disk WD20NMVW-11VA3S4 damage does not recognize the strike disk clean room open recovery data

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This hard drive is definitely a wonderful!! It's the first time you've had this kind of hard drive, and maybe you've met and solved it, but I did. The problem with the
West number of hard drive firmware is still much higher. This kind of hard disk does not recognize the disk a lot of time simple to get it done, the data is still very OK, the overall success rate is high. Today said this hard disk for me is also a wonderful, the motor speed is normal, not recognized, because it is USB3.0 's mouth so directly changed to become SATA so that UDMA can operate, in the past, this hard disk changed directly on the device for a long time to wait will be ready, the hard disk is dead or Alive is "busy" state, repeated operation wait    finally to become a "lamp" all out, I am more than on the non-sincerity do not disturb the misery of him, but give me to leave a lamp and so on!!! Sorrow, the sorrow of doing data recovery!     Hand Touch the hard drive motor is still turning, can start to explain the circuit board no problem, at this time also ignored the board on the issue of firmware, in the sense of the motor, the speed of rotation that call a normal, have encountered similar, change the head on OK, without hesitation, direct opening, Change the head again power, fault is still, that call a same. This two-fingered, depressed an afternoon, verify that the fault disk head is good, since the head is a good motor is no problem, then only the problem of ROM chip, because the west number of hard disk especially USB3.0 has not encountered the ROM damage caused this phenomenon, so I do not know where to start, Lock ROM problem, directly through the SATA interface to read the firmware is impossible, because the status of the light does not have a face, all TMD, so through the COM port strong read ROM firmware, (note that the west number of the hard drive COM port must be connected to) this hard disk has tried to use   rom recovery function for ROM automatic writeback, but all failed, so do not think so    "so  easy", COM port read ROM firmware speed is still OK 256k   soon read , the ROM firmware is opened with the Winhex tool, then the ROM Moudel firmware one by one is separated out, and then write back to the good circuit board, the data can be extracted!

West number hard disk WD20NMVW-11VA3S4 damage does not recognize the strike disk clean room open recovery data