807 You are no longer using the disk in question
Reset scratch disk, page 807
Offline files at launch
#1: Project's clips are offline and unavailable
Project has a missing scratch disk
Reconnect offline clips, page 809- 812
Problems importing audio files from CDs
#1: Audio files drop frames and go offline after relaunching FCP
Referencing the audio files from the CD in the CD-ROM drive
Copy audio files to hard drive before importing them into FCP, page 813