Helo there friends uhmm i need help from the expert am having trouble now and confuse on my imac uhmm my imac has a 1T internal drive and i made an partition for mac is 900GB and windows for 100GB, now i put my video files for about 172.39 GB in my mac but i wonder why it consume all in all for about 899.77GB, and beside i only used 172.39 GB videos i can't find where and what are the other files that storm my my internal drive that reach into 899.77GB, is anybody there knows about my concern?