I did DV tape import last night now with 250Gb HDD I think my MacBook can swallow all 7 x 60 minutes tapes I have.
Import for first 2 tapes was OK and I left it running while having dinner. The third tape I watched it and saw 'Time Machine' clicking in. Then I started to see checkers on screen and the same from the SONY camcorder. Few minutes later iMovie crashed.
I guess to avoid having quality issue with imported movies I better watch carefully tonight when I try importing again. This time I'll turn off 'Time Machine'.