Question about Computers & Internet
To start ensure that the hard drive is faulty. Test the hard disk by connecting it to a different Mac or Windows computer.
If no computer is available cut power to Mac and USB disk. by draining power you can fix some problem. Also remove battery if you have a notebook. Wait ten minutes, connect everything back to power. Connect first power cords and start Mac and disk, then connect USB cable.
If that does not work try also updating Mac OS.
If it is possible test the disk on different computers, this will save you from doing all the procedure descripted above. If the disk does not work on more than one computer, then problem is the disk and you do not need to reinstall Mac OS. Do the same the power drain, just in case.
If you find out that disk is faulty, then you still have some hope. External hard drives are made of two essential parts:
You will need a SATA enclosure for this disk. Depending on physical size of the hard drive the enclosure can be 2.5 or 3.5 inches.
Note: If the hard disk makes whirring and clicking sound all the time, then problem may be the internal disk heads.
If all the above does not work, then problem is internal hard disk mechanical failure or hard disk internal board (the one mounted at the base of HDD failure.
In that case fixing the hard drive is still possible but quite expensive, and there is no 100% warranty of succeeding.
The recovery job is done in protected environment, using a facility called clean room.
Here a UK company with clean room.
Here US: Hard Drive Recovery Group
Here AU: Class-100 Data Recovery Clean Room
Posted on Sep 16, 2010
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Posted on Jan 02, 2017
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