Unpacked .wim image (lets say win8) is around 14gb but packed it is around 3,55gb i think its normal, i cannot check cuz my image size says N/A ... EDIT: I used wim manager to remove something inside install.wim when you apply the changes the image size = 14.13gb wich is correct. when install.wim will be unmounted it will be shrinked (or maybe it already shrinked back) to 3.55gb or something around that. So to the point if its normal? yes it is normal. don't forget that .wim's are made using high compression