External Drive not recognized anymore????

Just hoping I can find an answer about this from the community since I'm so inexperienced with the technical stuff pertaining to my iMac.  For some odd reason, and I suppose it could just be that hard drives don't last forever, not sure, a My Book Essential External 3TB, USB 3.0 drive all of the sudden is not recognized by my iMac nor my MacBook Air.  Literally overnight it just stopped being recognized by my apple computers.  I had a whole bunch of data on it that I don't know how I'm going to replace it if I can't get an answer to this. The drives light comes on when the iMac system boots up in the morning, but it don't fire up (I think technically it's called initializing).  Any help/suggestions would be greatly appreciated.

test with another computer even a windows computer should be able to detect it even if not mount it
because of the filesystem not being native supported
my wd my book ext 1TB usb2/eSATA/firewire died after 1-1/2 years after having problems spinning up a lot so I had to turn it on and off and on and off to get it to start
toke the box apart and put the 1TB hd in another external case and there it worked so suppose WD are better at making hd's then the external enclosure

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