Hi pjd1203 
The Finder probably isn't the best way of transferring your movies to the Mac.
If you're running a recent Mac OS (Snow Leopard onwards) you should have iMovie 11. This will import, convert and organise your movies without removing them from the card.
Just connect the camera, launch iMovie and power on the camera. Click the camera icon middle-left of the iMovie window and you should see your clips.
Cheers
Mick