A trusted replacement for Singlemizer (Duplicate file finder) that works

Hi

I have been using Singlemizer for a while and have been happy with the results (and what it deletes). I do check it so not deleing things I should be keeping.

But last week, I transferred 10 duplicated HD video clips to a folder just to test it again and it could not see them as duplicates.

So, to save me wasting time, I am looking for a decent and trusted replacement so I can continue to delete old duplicated files from a relatinves old external drives.

Thanks in advance for your help.

Matt