Hi. 

I have an Acer Acer Aspire laptop running windows 10.

My problem is I can't open my D drive or access the files on it because I am told I have a fatal device hardware error.  For the same reason my windows defender can't run a scan on the D drive.  Windows defender says my computer is protected and up to date.

To date, I have been backing up to my Seagate Hard drive. Everything was working fine until I accidentally removed my device from the USB port.   My Seagate is not even showing up under my D drive now. 

I have tried trouble shooting but get the same fatal error message.

When I go into settings, backup and more options I can't go any further.  That was where I could usually see my Seagate to backup to.

At one stage I was told I had to reconnect my file history but when I try, the same error shows.  Please help.