Your frustration is completely understandable. However, in order to get help from the forum members and the mods we're going to need additional information to attempt to isolate the source and cause of the problem. Go to https://forums.pioneerdj.com/hc/en-us/articles/205021519-Read-this-article-before-posting-for-help-with-rekordbox- and scroll to the bottom of the page to the headline "Information Required for Support." Copy/paste those questions (along with your answers) in this post. Also include information such as the brand/model of your external HDD and USB flash. Cheers.