Using a MacBook 2.4ghz/2GB/150GB, and an external 500GB. This only happens intermittantly, but I have no idea what's causing it: Using image capture to pull NEFs from my D300 directly onto my external. Have an external iPhoto library on that HD, which I am 100% positive I am running iPhoto off of. Image capture library on external HD. Library on external HD. When I import photo files on the external to the photo library on the external, my Mac HD **sometimes** temporarily gives up the same amount of space as if I were importing the photos directly onto it. So I import 1GB of photos, capacity of external goes down by 1GB (which is fine), but capacity of my Macintosh HD _also_ goes down by 1GB? Then I have to reset the computer for the missing 1GB to reappear? What the heck is going on?