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Cannot fully defrag (optimize) hard drive
I am unable to fully defragment (optimize) the hard drive on my laptop. I have already downloaded Windows 10. The problem started about a week ago. After I "analyzed" the hard drive it said 21% defragmented! After defragging with several passes it always came back 14% defragged and remains that way. (Prior to several checks early-on after the Win 10 download it was always only about 3-4% defragged so I didn't bother optimizing). No viruses were picked up by Norton after several full scans. I don't know whether I have a bad sector on my drive or maybe leftover Windows 10 garbage or maybe something else. Any thoughts on how I might further troubleshoot and/or fix the problem? I'm not a technical person and I'm using a Toshiba Satellite laptop. Thanks in advance for any help.