recording audio in imovie 3

[Norm Lamoureux]

Hello, Can anyone offer an explanation as to why the
following happened? 
While recording a cassette tape through an imic into
imovie3 i got this message about 9 min 30 sec's into
recording

           "The disk responded slowly. It may have
been interrupted by something, or it may not be fast
enough for your movie. If you have a lot of audio
clips, you might try muting the audio tracks to see if
it helps playback speed."

I tried recording again from the start and at exactly
the same spot the message came up again. I then
started another track where that one left off and
started recording again. Then at about 19 min's in the
thing just locked up on me. No message's, No nothing.
Any suggestion's would be appreciated.

Thank's 
Norm L.

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