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How to easily copy thousands of files minus duplicates

I have ordered a new pc. I wish to transfer all the mp3 files from the old c, d, e, and f drives to t 5 tb hard drive. How can I best accomplish this without ending up with a lot of duplicates>? I am certainly open to paying for software that will accomplish this for me IF it is easy to learn.  I am hoping that there is a simple dos command or series of dos commands that will give the desired result.
As an aside, I have several backups that have the same exact files in them, perhaps even up to 75% and that quantity of dups can be a very challenging task comparing one to one. Hope someone has an easy way out for me. THANKS!
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Shaun Vermaak
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Thanks a heap Experts!
Avatar of Bill Prew
Bill Prew

Weeding out duplicate MP3 files can be quite a challenge.  There is meta data in the files and even though the music might be the same the files might not match 100%, which is what a lot of the duplicate checking programs go after.

Also, how are the collections organized, is there a logical structure to it, where you have say folders for artist, and then folders for albums, with songs under them?  Or just big piles of files?

If you have albums stored in folders, then you have to apply human logic in cases where several songs in an album might match to a different folder in a different collection, but not all the files do.  So then which do you keep, etc.  It really can take a lot of time to clean up the collection(s) thoroughly and accurately.

I would recommend you clean the files removing duplicates before you copy, that makes the most sense.  There are a lot of options for free or low cost tools that can help with this, take a look at some of these:

Duplicate Cleaner - Find Duplicate Files
Similarity - Remove similar, duplicate MP3, music, audio files by content, tags
Duplicate Music Files Finder
Duplicate Songs Finder - Remove Duplicate Mp3 Files

~bp