I was running final cut pro 6.06 with two external drives. At various times, for no reason, both disconnected improperly. The frames in the clips in the project I was working on suddenly read media offline although they continued to playback fine. But when I export in QT, playback is choppy. The format is xdcam hd 720. Could the footage be damaged from the disconnect or is there a way to fix playback in fcp.