I noticed on my MBP that suddenly 30gb had been used up mysteriously. I had imported a lot of images with a total library of close to 2k photos but no where near 47gb worth. I have three huge files in the iPhoto Library all ThumbXXXSegment.data. Is there a way to make these files smaller without removing all my photos from iPhoto? And why are they so huge in the first place??? Thanks in advance !