Question Bad sector increasing without any reason.

Nov 13, 2018
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Hi guys I replaced HDD with 1TB brand new HDD 50 day ago.At the beginning HDD sentinel was showing 100% .Yesterday suddenly dropped 16%.And today 15.How?? WHy??My causes to this?

hard-disk-03052019.jpg


AS YOU CAN SEE..WHAT"S HAPPINING?????