External wester digital hd not recognize by my iMac

need help why my western digital passport  was sudenly not recognize by my iMac, after downloding smartware  new version, that unit was in my dash board by the time I'm downloding the software, however, it suddenly disappear, I disconet and connect it again, but no icon show

After a year or so my wd book did the same thing turning it on and off for a bit would most of the time being it about but in the end it was permenent and i solved it but opening the external case and take out the hd which worked fine so it was the ext psu not giving enough power

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