Hi, I'm new to here so i'm sorry if I posted this in the wrong section. I was using a Mac Mini(Late 2012) and i'd already had bootcamp on it with Windows 8 and I downloaded the Windows 10 Technical Preview and installed it off Windows 8. I should of made another partition but I didn't think about it at the time. I was on Windows 10 for a few hours and then I went to bed, when I woke up and I turned on my Mac Mini it didn't detect the Hard Drive and it wasn't available in the Disk Utility.
Danny
Danny