Look on the external hard drive and get the names of the files. Then, search for those files on your internal hard drive, they're probably all under My Documents. Once you find them, delete them from the internal drive. That's it...
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How do I transfer files from Windows Media Player
I am currently using WMP10 and have limited space left on my hard drive. I purchased a 250 GB external Hard drive and I want to transfer the music from WMP10 to the external which would free up some hard drive space. When I transfered the music to the external hard drive and opened up WMP10 I had duplicate files. What's the best way to transfer these music files to the external hard drive and keeping them off my internal hard drive.