MY 500 GB WD only shows 60GB

Sep 20, 2018
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Hello,
My wd 500 gb lost reduced it storage to 60 gb.
Am able to utilize 60gb without issue, however my concern is where did the remaining over 400gb go?
I have tested using both LInux OS and Windows 10, and on disk mgt but it only displaying 60gb.

Kindly assist.
Thanks.