External Hard Drive Now Reading as Unallocated Partition?

Hi,



I recently removed a WD external hard drive from its enclosure and placed it inside my PC. After booting up, the hard drive now shows to be Unallocated



I downloaded AOMEI Partition bumistant and ran a Check Bad Sector, the drive is completely healthy, no bad sectors appear.



I am now running Minitool's Partition Wizard and using the Partition Recovery Wizard. I won't know anymore until that completes. But, is there anything else I can do in the mean time?



Also, does anyone have any insight on why this occurred? I have seen multiple occurrences of this happening after searching around. I was very gentle with the drive, and it was never mishandled.



Did it occur solely because of the IO changeover?



Please Help.



Thanks!



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