You do need to check exactly what you've downlded from time to time. That means you've downlded the same file from the same or different source. Do you ever check thru to make sure you don't have duplicates of the same file. Sure check the bit-rate or other id-tag info. But check what you have & make sure it works ok! If you have a duplicate or another version of same title but diffrent bit-rate or other quality then delete the one you don't need.