I'm trying to create a partition for Windows using Boot Camp Assistant. I was hoping to use it for gaming, so I'll need about 40GB. Here's the weird thing. Boot Camp Asst is telling me I only have 21GB of space. My Mac HD says I have 104GB of free space...and my "About This Mac" Storage section says I have 40GB of free space. What the heck! Pretty large discrepancies here How can I resolve this? I have a retina macbook pro with an SSD. I have read that SSDs don't need to (and should not be) defragmented.