How to access external hard disk when it is not detecting

i have WD external hard disk which fell down while using and since then its not been detetected in any computer or laptop, i tried to use it as slave drive to get the data, but there also it shows as unallocated space
please advise as how to retrieve dat
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More about access external hard disk detecting
  1. It sounds like the drive has failed, in which case there is no way to access the data at home. You need to take or send the drive to a professional data-recovery service.

    It is likely that some of the data will be corrupted anyway, that's why keeping backup copies on a different drive is so important.
  2. Put the HDD (the actual 3.5" silver/black Hard Disk Drive, not the PC unit) wrapped in about 14 sheets of newspaper within a series of plastic bag (three layers deep) and put it in your freezer for 4 to 8 hours.

    When it thaws out the actuators and drive heads will probably start moving freely again.

    You shouldn't loose a huge amount of data either.

    - Not this is not a joke!

    Then use TestDisk to recover your data:
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