How long does it take to make an external boot disk? I have a 2012 MacMini, and I wanted to reinstall OSX to speed it up, and I figured since I'm at it, I might as well install an SSD. So, I have a 3TB USB 3.0 external hard drive that I'm using to make an external boot disk. There are about 390 GB worth of data on my MacMini. I have ChronoSync, so I'm using that to make the bootable disk. But this is taking forever! It's been running since Sunday morning, so more than 48 hours now. It is progressing, but really slowly. Does it take that long? I figured it might take overnight, or even the better part of an entire day, but we're pushing into day 3 now. Is this normal?