I have the same problem.
I am having ADATA 2TB External Hard Disk
ADATA 2TB
External Hard Disk
Model - ADATA HD710
USB 3.0
I have tried :
1. Uninstalling and then again reinstalling driver in Device Manager>Disk drives>ADATA HD710 USB Device
2. Disk Management>Disk 1 Unknown Not Initialized...
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