Hi, I'm new to this, so hope someone can help.

I've started importing Hi8 analogue tapes via a Sony Digital 8 camcorder onto a MacBook with iMovie 09. I'm storing them straight onto an external hard drive.

On several of the event files, the import works fine. But recently, the sound has been disappearing after import. The sound is there on imovie after import, but on coming back to some files later I find it has gone. It is still there on the smaller imovie files (10 hours of taping and less). Could the size of the file be the issue?

I've tried restarting. The Sound settings on System Preferences seems ok. Any ideas?

Tech info: Macbook is OS X, version 10.6.6, 4 GB. Sony digital 8 is TRV-110E. External Hard drive is WD 1 TB, connected by Firewire 800. The clips are saved in the Hard drive as .dv files.