Go to the number where FCPX Libraries includes the Libraries are iconed with 4 black patch, and known 'library like fcpbundle. These are the libraries that you created first for your projects and contain Event files. If you trash Library files, all the project work will be lost. So be sure that is what you really want to do. You can also trash the related fcp replacement files you will find on the drive. Finally you will trash all the system files on whatever drive number they may be on. I personally would never trash system files and HDDs for archiving stuff are as cheap as putts these days......
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