buried in endless spam are you.
does it fail on 2nd PC????????????????????????????
but yes, I am the MVP of external HDD< I build my own.
Have over 5 here for Backups .
lots of causes, for sure bad drive, or missing drivers..
bad HW hardware or BAD software SW.
Missing 12vdc 2amp power pack>, lost or using wrong one.
when pack above does the HDD spin? usb connected to PC.
NO PC stated, NO OS stated, windows/chrome/Linux/android?
its at lease 10 years old , see posts back that far.
not good old HDD,this old.
sold during W7 era. 2009.
The drive has 3.5" HDD that needs lots of power (Amps)
to start up that big motor inside, and is first thing to learn .
2amps it needs, ok? so if pack is missing it will never startup
on any USB port, not rated for 20x standard USB load factors.
some laptops only do 0.1amps (100mA) and are useless to startup any hdd motor of any kind.
see why here.
and see a better extremal solution cheap.! $10
http://www.pcdied.com/external-hdd.html