You may get an better answer, but when I save something to my flash drive it gives me a warning if there is already a file with the same name. That being said, I still find duplicates where I've named them slightly different. The other problem is I have several folders (i.e. type, designer, piecing or applique for example) and you can have the same file name within a folder so there are more duplicates.
I would be curious if there are other sorting methods that could be used.