run chkdsk on the drives, if you want a quick check do chkdsk x: /f - or if you want to test the drive for errors and bad sectors use chkdsk x: /r /f (x: being the drive your scanning) if the drives are big it will take time, that and the cpu speed will affect it.
I norm run /f a few times first as this will fix most issues, keep doing it till it says windows has found no problems, the run it with /r /f
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