File Shredder won't shred some files


I have Bitdefender Internet Security 2018.


I have used Bitdfender for many years and have never had a problem with the file shredder until now.


I have an external hard drive. I shredded a few directories on it with no problems. Then when I tried to shred one directory, it started to do its thing, then  after a couple of seconds it turned yellow and said "unable to delete file". Nothing else. I used File Explorer to look and saw no files. I turned on the hidden files option and still couldn't see anything. I then went into the Windows command prompt and saw a bunch of files.  I know I could probably delete the files from the Windows Prompt but I want them shredded. So my questions are:


1) Why will Bitdefender not delete those files? I am the administrator so that shouldn't be an issue.


2) How can I shred those files since obviously Bitdefender is having issues? I want them shredded.


Thanks


 

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