Hi guys , I have seagate 500gb HDD in office and it's now showing only 3.9gb .. I've tried several times to install OS still

Mar 15, 2018
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Hi guys ,

I have seagate 500gb HDD in office and it's now showing only 3.9gb .. I've tried several times to install OS still it's showing up 3.9gb.. data's much importance to company..

Can anyone help me out for this issue or give me any ideas???????